{"id":398,"date":"2025-10-01T13:20:49","date_gmt":"2025-10-01T06:20:49","guid":{"rendered":"https:\/\/www.299engineering.co.th\/?p=398"},"modified":"2025-10-02T15:46:08","modified_gmt":"2025-10-02T08:46:08","slug":"%e0%b8%ab%e0%b8%a5%e0%b8%b1%e0%b8%81%e0%b8%9e%e0%b8%b7%e0%b9%89%e0%b8%99%e0%b8%90%e0%b8%b2%e0%b8%99%e0%b8%82%e0%b8%ad%e0%b8%87%e0%b8%81%e0%b8%b2%e0%b8%a3%e0%b8%84%e0%b8%a7%e0%b8%9a%e0%b8%84%e0%b8%b8","status":"publish","type":"post","link":"https:\/\/www.299engineering.co.th\/?p=398","title":{"rendered":"\u0e2b\u0e25\u0e31\u0e01\u0e1e\u0e37\u0e49\u0e19\u0e10\u0e32\u0e19\u0e02\u0e2d\u0e07\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a \u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07 (Self-holding Circuit)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. \u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a\u0e04\u0e37\u0e2d\u0e2d\u0e30\u0e44\u0e23?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a \u0e2b\u0e21\u0e32\u0e22\u0e16\u0e36\u0e07 \u0e01\u0e32\u0e23\u0e2a\u0e31\u0e48\u0e07\u0e07\u0e32\u0e19\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23\u0e2b\u0e23\u0e37\u0e2d\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e15\u0e32\u0e21 <strong>\u0e02\u0e31\u0e49\u0e19\u0e15\u0e2d\u0e19\u0e17\u0e35\u0e48\u0e01\u0e33\u0e2b\u0e19\u0e14\u0e44\u0e27\u0e49\u0e25\u0e48\u0e27\u0e07\u0e2b\u0e19\u0e49\u0e32<\/strong><\/li>\n\n\n\n<li>\u0e04\u0e33\u0e2d\u0e18\u0e34\u0e1a\u0e32\u0e22\u0e07\u0e48\u0e32\u0e22 \u0e46: \u0e40\u0e23\u0e32\u0e15\u0e31\u0e49\u0e07\u0e40\u0e07\u0e37\u0e48\u0e2d\u0e19\u0e44\u0e02 \u2192 \u0e15\u0e23\u0e27\u0e08\u0e2a\u0e2d\u0e1a\u0e27\u0e48\u0e32 \u201c\u0e1c\u0e48\u0e32\u0e19\u201d \u0e2b\u0e23\u0e37\u0e2d \u201c\u0e44\u0e21\u0e48\u0e1c\u0e48\u0e32\u0e19\u201d \u2192 \u0e16\u0e49\u0e32\u0e1c\u0e48\u0e32\u0e19 \u0e23\u0e30\u0e1a\u0e1a\u0e08\u0e30\u0e17\u0e33\u0e07\u0e32\u0e19\u0e44\u0e1b\u0e15\u0e32\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a\u0e17\u0e35\u0e48\u0e40\u0e15\u0e23\u0e35\u0e22\u0e21\u0e44\u0e27\u0e49<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udca1 \u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07: \u0e40\u0e1b\u0e34\u0e14\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e0b\u0e31\u0e01\u0e1c\u0e49\u0e32 \u2192 \u0e40\u0e15\u0e34\u0e21\u0e19\u0e49\u0e33 \u2192 \u0e0b\u0e31\u0e01 \u2192 \u0e1b\u0e31\u0e48\u0e19 \u2192 \u0e40\u0e2a\u0e23\u0e47\u0e08\u0e40\u0e23\u0e35\u0e22\u0e1a\u0e23\u0e49\u0e2d\u0e22<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u0e27\u0e07\u0e08\u0e23\u0e17\u0e35\u0e48\u0e07\u0e48\u0e32\u0e22\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14<\/h2>\n\n\n\n<p>\u0e40\u0e23\u0e34\u0e48\u0e21\u0e08\u0e32\u0e01\u0e27\u0e07\u0e08\u0e23\u0e1e\u0e37\u0e49\u0e19\u0e10\u0e32\u0e19: <strong>\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c + \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized wp-duotone-unset-1\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"693\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-4-1024x693.png\" alt=\"\" class=\"wp-image-411\" style=\"box-shadow:none;width:430px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-4-1024x693.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-4-300x203.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-4-768x519.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-4.png 1372w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u0e16\u0e49\u0e32\u0e01\u0e14\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c \u2192 \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f\u0e15\u0e34\u0e14<\/li>\n\n\n\n<li>\u0e16\u0e49\u0e32\u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c \u2192 \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f\u0e14\u0e31\u0e1a<\/li>\n<\/ol>\n\n\n\n<p>\u0e19\u0e35\u0e48\u0e04\u0e37\u0e2d\u0e2b\u0e19\u0e48\u0e27\u0e22\u0e17\u0e35\u0e48\u0e40\u0e25\u0e47\u0e01\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14\u0e02\u0e2d\u0e07\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a \u0e40\u0e1e\u0e23\u0e32\u0e30\u0e17\u0e38\u0e01\u0e2d\u0e22\u0e48\u0e32\u0e07\u0e17\u0e33\u0e15\u0e32\u0e21\u0e02\u0e31\u0e49\u0e19\u0e15\u0e2d\u0e19\u0e41\u0e25\u0e30\u0e40\u0e07\u0e37\u0e48\u0e2d\u0e19\u0e44\u0e02\u0e17\u0e35\u0e48\u0e40\u0e15\u0e23\u0e35\u0e22\u0e21\u0e44\u0e27\u0e49\u0e41\u0e25\u0e49\u0e27<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04 (Contact) \u0e04\u0e37\u0e2d\u0e2d\u0e30\u0e44\u0e23?<\/h2>\n\n\n\n<p>\u0e43\u0e19\u0e27\u0e07\u0e08\u0e23\u0e44\u0e1f\u0e1f\u0e49\u0e32 \u0e40\u0e23\u0e32\u0e43\u0e0a\u0e49\u0e04\u0e33\u0e27\u0e48\u0e32 \u201c\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c\u201d  \u0e41\u0e25\u0e30\u0e22\u0e31\u0e07\u0e43\u0e0a\u0e49\u0e04\u0e33\u0e27\u0e48\u0e32 <strong>\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04<\/strong> \u0e2b\u0e23\u0e37\u0e2d\u0e2b\u0e19\u0e49\u0e32\u0e2a\u0e31\u0e21\u0e1c\u0e31\u0e2a\u0e42\u0e25\u0e2b\u0e30\u0e0a\u0e48\u0e27\u0e22\u0e40\u0e0a\u0e37\u0e48\u0e2d\u0e21\u0e15\u0e48\u0e2d\u0e27\u0e07\u0e08\u0e23\u0e44\u0e1f\u0e1f\u0e49\u0e32 \u0e2d\u0e35\u0e01\u0e14\u0e49\u0e27\u0e22<br>\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c\u0e01\u0e47\u0e40\u0e1b\u0e47\u0e19 <strong>\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e47\u0e01<\/strong> \u0e40\u0e0a\u0e48\u0e19\u0e01\u0e31\u0e19 \u0e21\u0e31\u0e19\u0e17\u0e33\u0e07\u0e32\u0e19\u0e42\u0e14\u0e22\u0e2d\u0e32\u0e28\u0e31\u0e22\u0e41\u0e23\u0e07\u0e01\u0e14\u0e08\u0e32\u0e01\u0e21\u0e37\u0e2d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized wp-duotone-unset-2\"><img loading=\"lazy\" decoding=\"async\" width=\"808\" height=\"580\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image.png\" alt=\"\" class=\"wp-image-408\" style=\"box-shadow:none;width:226px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image.png 808w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-300x215.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-768x551.png 768w\" sizes=\"auto, (max-width: 808px) 100vw, 808px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04 A (NO \u2013 Normally Open)<\/strong><br>\u2192 \u0e1b\u0e01\u0e15\u0e34 \u201c\u0e44\u0e21\u0e48\u0e15\u0e48\u0e2d\u0e27\u0e07\u0e08\u0e23\u201d \u2192 \u0e08\u0e30\u0e15\u0e48\u0e2d\u0e44\u0e14\u0e49\u0e40\u0e21\u0e37\u0e48\u0e2d\u0e01\u0e14\u0e2b\u0e23\u0e37\u0e2d\u0e16\u0e39\u0e01\u0e14\u0e36\u0e07\u0e14\u0e49\u0e27\u0e22\u0e41\u0e21\u0e48\u0e40\u0e2b\u0e25\u0e47\u0e01\u0e44\u0e1f\u0e1f\u0e49\u0e32<\/li>\n\n\n\n<li><strong>\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04 B (NC \u2013 Normally Closed)<\/strong><br>\u2192 \u0e1b\u0e01\u0e15\u0e34 \u201c\u0e15\u0e48\u0e2d\u0e27\u0e07\u0e08\u0e23\u201d \u2192 \u0e08\u0e30\u0e02\u0e32\u0e14\u0e40\u0e21\u0e37\u0e48\u0e2d\u0e01\u0e14\u0e2b\u0e23\u0e37\u0e2d\u0e16\u0e39\u0e01\u0e14\u0e36\u0e07\u0e14\u0e49\u0e27\u0e22\u0e41\u0e21\u0e48\u0e40\u0e2b\u0e25\u0e47\u0e01\u0e44\u0e1f\u0e1f\u0e49\u0e32<\/li>\n<\/ul>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;69f9cb46d8433&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"69f9cb46d8433\" class=\"wp-block-image size-large is-resized has-custom-border is-style-default wp-duotone-unset-3 wp-lightbox-container\" style=\"margin-top:0;margin-bottom:0\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"982\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-3-1024x982.png\" alt=\"\" class=\"wp-image-409\" style=\"border-style:none;border-width:0px;box-shadow:none;width:297px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-3-1024x982.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-3-300x288.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-3-768x737.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-3.png 1180w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c\u0e04\u0e37\u0e2d\u0e2d\u0e30\u0e44\u0e23?<\/h2>\n\n\n\n<p>\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c\u0e04\u0e37\u0e2d \u201c\u0e2a\u0e27\u0e34\u0e15\u0e0a\u0e4c\u0e17\u0e35\u0e48\u0e17\u0e33\u0e07\u0e32\u0e19\u0e14\u0e49\u0e27\u0e22\u0e44\u0e1f\u0e1f\u0e49\u0e32\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/a\/a0\/Relay_principle_horizontal_new.gif\" alt=\"\" style=\"box-shadow:none;aspect-ratio:1;width:204px;height:auto\"\/><\/figure>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;69f9cb46d8995&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"69f9cb46d8995\" class=\"wp-block-image size-large is-resized wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1010\" height=\"1024\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-2-1010x1024.png\" alt=\"\" class=\"wp-image-415\" style=\"box-shadow:none;width:276px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-2-1010x1024.png 1010w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-2-296x300.png 296w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-2-768x779.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-2.png 1140w\" sizes=\"auto, (max-width: 1010px) 100vw, 1010px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e20\u0e32\u0e22\u0e43\u0e19\u0e21\u0e35 <strong>\u0e04\u0e2d\u0e22\u0e25\u0e4c<\/strong> \u0e41\u0e25\u0e30 <strong>\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04<\/strong><\/li>\n\n\n\n<li>\u0e40\u0e21\u0e37\u0e48\u0e2d\u0e08\u0e48\u0e32\u0e22\u0e44\u0e1f\u0e40\u0e02\u0e49\u0e32\u0e04\u0e2d\u0e22\u0e25\u0e4c \u2192 \u0e40\u0e01\u0e34\u0e14\u0e41\u0e21\u0e48\u0e40\u0e2b\u0e25\u0e47\u0e01 \u2192 \u0e14\u0e36\u0e07\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04\u0e43\u0e2b\u0e49\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e2a\u0e16\u0e32\u0e19\u0e30<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udccc \u0e17\u0e33\u0e43\u0e2b\u0e49\u0e40\u0e23\u0e32\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e27\u0e07\u0e08\u0e23\u0e43\u0e2b\u0e0d\u0e48 (\u0e44\u0e1f\u0e1a\u0e49\u0e32\u0e19 220V) \u0e14\u0e49\u0e27\u0e22\u0e27\u0e07\u0e08\u0e23\u0e40\u0e25\u0e47\u0e01 (\u0e41\u0e1a\u0e15\u0e40\u0e15\u0e2d\u0e23\u0e35\u0e48 24V) \u0e44\u0e14\u0e49<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07 (Self-holding Circuit)<\/h2>\n\n\n\n<p>\u0e19\u0e35\u0e48\u0e04\u0e37\u0e2d\u0e2b\u0e31\u0e27\u0e43\u0e08\u0e2a\u0e33\u0e04\u0e31\u0e0d!<br>\u0e17\u0e33\u0e43\u0e2b\u0e49\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07 <strong>\u0e17\u0e33\u0e07\u0e32\u0e19\u0e15\u0e48\u0e2d\u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07\u0e44\u0e14\u0e49\u0e41\u0e21\u0e49\u0e40\u0e23\u0e32\u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e1b\u0e38\u0e48\u0e21\u0e2a\u0e15\u0e32\u0e23\u0e4c\u0e17\u0e41\u0e25\u0e49\u0e27<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0e25\u0e33\u0e14\u0e31\u0e1a\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-1024x575.png\" alt=\"\" class=\"wp-image-423\" style=\"box-shadow:none;width:500px\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-1024x575.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-300x169.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-768x431.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-1536x863.png 1536w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-10-2048x1151.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-left\">1. \u0e27\u0e07\u0e08\u0e23\u0e1e\u0e23\u0e49\u0e2d\u0e21\u0e17\u0e33\u0e07\u0e32\u0e19<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-1024x575.png\" alt=\"\" class=\"wp-image-424\" style=\"box-shadow:none;width:500px\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-1024x575.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-300x169.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-768x431.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-1536x863.png 1536w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-11-2048x1151.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>2. \u0e01\u0e14\u0e1b\u0e38\u0e48\u0e21 <strong>Start<\/strong> \u2192 \u0e01\u0e23\u0e30\u0e41\u0e2a\u0e44\u0e1f\u0e40\u0e02\u0e49\u0e32\u0e04\u0e2d\u0e22\u0e25\u0e4c\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c \u2192 \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f\u0e15\u0e34\u0e14 \u2192 \u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c\u0e14\u0e36\u0e07\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04\u0e43\u0e2b\u0e49\u0e1b\u0e34\u0e14\u0e27\u0e07\u0e08\u0e23\u0e14\u0e49\u0e27\u0e22<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-1024x575.png\" alt=\"\" class=\"wp-image-427\" style=\"box-shadow:none;width:500px\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-1024x575.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-300x169.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-768x431.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-1536x863.png 1536w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-5-2048x1151.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>3. \u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e1b\u0e38\u0e48\u0e21 Start \u2192 \u0e41\u0e15\u0e48\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e47\u0e01\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c\u0e22\u0e31\u0e07 \u201c\u0e14\u0e39\u0e14\u0e15\u0e34\u0e14\u201d \u0e2d\u0e22\u0e39\u0e48 \u2192 \u0e27\u0e07\u0e08\u0e23\u0e22\u0e31\u0e07\u0e17\u0e33\u0e07\u0e32\u0e19\u0e15\u0e48\u0e2d<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-1024x575.png\" alt=\"\" class=\"wp-image-426\" style=\"box-shadow:none;width:500px\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-1024x575.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-300x169.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-768x431.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-1536x863.png 1536w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2025\/10\/image-13-2048x1151.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>4. \u0e01\u0e14\u0e1b\u0e38\u0e48\u0e21 <strong>Stop<\/strong> (\u0e04\u0e2d\u0e19\u0e41\u0e17\u0e04 B) \u2192 \u0e15\u0e31\u0e14\u0e44\u0e1f\u0e40\u0e02\u0e49\u0e32\u0e04\u0e2d\u0e22\u0e25\u0e4c \u2192 \u0e04\u0e2d\u0e19\u0e41\u0e17\u0e47\u0e01\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c\u0e1b\u0e25\u0e48\u0e2d\u0e22 \u2192 \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f\u0e14\u0e31\u0e1a<\/p>\n\n\n\n<p>\ud83d\udca1 \u0e2a\u0e23\u0e38\u0e1b: \u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c \u201c\u0e08\u0e33\u0e2a\u0e16\u0e32\u0e19\u0e30\u201d \u0e02\u0e2d\u0e07\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07\u0e44\u0e27\u0e49\u0e08\u0e19\u0e01\u0e27\u0e48\u0e32\u0e08\u0e30\u0e16\u0e39\u0e01\u0e2a\u0e31\u0e48\u0e07\u0e43\u0e2b\u0e49\u0e2b\u0e22\u0e38\u0e14<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. \u0e17\u0e33\u0e44\u0e21\u0e15\u0e49\u0e2d\u0e07\u0e40\u0e23\u0e35\u0e22\u0e19\u0e23\u0e39\u0e49\u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e21\u0e31\u0e19\u0e04\u0e37\u0e2d \u201c\u0e1e\u0e37\u0e49\u0e19\u0e10\u0e32\u0e19\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14\u201d \u0e02\u0e2d\u0e07\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e2d\u0e31\u0e15\u0e42\u0e19\u0e21\u0e31\u0e15\u0e34<\/li>\n\n\n\n<li>\u0e16\u0e49\u0e32\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e27\u0e07\u0e08\u0e23\u0e19\u0e35\u0e49 \u2192 \u0e08\u0e30\u0e15\u0e48\u0e2d\u0e22\u0e2d\u0e14\u0e44\u0e1b\u0e2a\u0e39\u0e48\u0e01\u0e32\u0e23\u0e40\u0e02\u0e35\u0e22\u0e19\u0e42\u0e1b\u0e23\u0e41\u0e01\u0e23\u0e21 PLC \u0e41\u0e25\u0e30\u0e23\u0e30\u0e1a\u0e1a\u0e2d\u0e31\u0e15\u0e42\u0e19\u0e21\u0e31\u0e15\u0e34\u0e2d\u0e37\u0e48\u0e19 \u0e46 \u0e44\u0e14\u0e49\u0e07\u0e48\u0e32\u0e22<\/li>\n\n\n\n<li>\u0e40\u0e1b\u0e23\u0e35\u0e22\u0e1a\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19\u0e01\u0e32\u0e23\u0e40\u0e23\u0e35\u0e22\u0e19\u0e04\u0e13\u0e34\u0e15\u0e28\u0e32\u0e2a\u0e15\u0e23\u0e4c \u2192 \u0e15\u0e49\u0e2d\u0e07\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e01\u0e32\u0e23\u0e1a\u0e27\u0e01\u0e40\u0e25\u0e02\u0e01\u0e48\u0e2d\u0e19 \u0e16\u0e36\u0e07\u0e08\u0e30\u0e44\u0e1b\u0e40\u0e23\u0e35\u0e22\u0e19\u0e04\u0e39\u0e13 \u0e2b\u0e32\u0e23 \u0e2b\u0e23\u0e37\u0e2d\u0e2a\u0e21\u0e01\u0e32\u0e23\u0e44\u0e14\u0e49<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. \u0e27\u0e34\u0e18\u0e35\u0e40\u0e23\u0e35\u0e22\u0e19\u0e23\u0e39\u0e49\u0e43\u0e2b\u0e49\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e08\u0e23\u0e34\u0e07<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e28\u0e36\u0e01\u0e29\u0e32\u0e2b\u0e25\u0e31\u0e01\u0e01\u0e32\u0e23\u0e08\u0e32\u0e01\u0e41\u0e1c\u0e19\u0e20\u0e32\u0e1e<\/li>\n\n\n\n<li>\u0e2b\u0e32\u0e01\u0e40\u0e1b\u0e47\u0e19\u0e44\u0e1b\u0e44\u0e14\u0e49 \u2192 \u0e25\u0e2d\u0e07\u0e15\u0e48\u0e2d\u0e27\u0e07\u0e08\u0e23\u0e08\u0e23\u0e34\u0e07 (\u0e43\u0e0a\u0e49\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c \u0e2b\u0e25\u0e2d\u0e14\u0e44\u0e1f \u0e41\u0e25\u0e30\u0e1b\u0e38\u0e48\u0e21\u0e2a\u0e15\u0e32\u0e23\u0e4c\u0e17\/\u0e2a\u0e15\u0e47\u0e2d\u0e1b)<\/li>\n\n\n\n<li>\u0e23\u0e30\u0e27\u0e31\u0e07\u0e40\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e04\u0e27\u0e32\u0e21\u0e1b\u0e25\u0e2d\u0e14\u0e20\u0e31\u0e22: \u0e43\u0e0a\u0e49\u0e44\u0e1f\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e15\u0e48\u0e33, \u0e2b\u0e25\u0e35\u0e01\u0e40\u0e25\u0e35\u0e48\u0e22\u0e07\u0e01\u0e32\u0e23\u0e25\u0e31\u0e14\u0e27\u0e07\u0e08\u0e23<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u0e2a\u0e23\u0e38\u0e1b<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e25\u0e33\u0e14\u0e31\u0e1a = \u0e01\u0e32\u0e23\u0e2a\u0e31\u0e48\u0e07\u0e07\u0e32\u0e19\u0e15\u0e32\u0e21\u0e02\u0e31\u0e49\u0e19\u0e15\u0e2d\u0e19\u0e17\u0e35\u0e48\u0e01\u0e33\u0e2b\u0e19\u0e14<\/li>\n\n\n\n<li>\u0e23\u0e35\u0e40\u0e25\u0e22\u0e4c = \u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e2b\u0e25\u0e31\u0e01\u0e43\u0e19\u0e01\u0e32\u0e23\u0e2a\u0e31\u0e48\u0e07\u0e15\u0e31\u0e14\u0e15\u0e48\u0e2d\u0e27\u0e07\u0e08\u0e23<\/li>\n\n\n\n<li>\u0e27\u0e07\u0e08\u0e23\u0e22\u0e36\u0e14\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07 = \u0e17\u0e33\u0e43\u0e2b\u0e49\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e22\u0e31\u0e07\u0e17\u0e33\u0e07\u0e32\u0e19\u0e15\u0e48\u0e2d\u0e41\u0e21\u0e49\u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e1b\u0e38\u0e48\u0e21\u0e2a\u0e15\u0e32\u0e23\u0e4c\u0e17<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udc49 \u0e16\u0e49\u0e32\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07 = \u0e04\u0e38\u0e13\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08 \u201c\u0e1b\u0e23\u0e30\u0e15\u0e39\u0e41\u0e23\u0e01\u201d \u0e02\u0e2d\u0e07\u0e42\u0e25\u0e01\u0e2d\u0e2d\u0e42\u0e15\u0e40\u0e21\u0e0a\u0e31\u0e19<\/p>\n\n\n\n<p>\u0e3aBibliography:<br><a href=\"https:\/\/en.wikipedia.org\/wiki\/Relay#Holding_circuit\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/en.wikipedia.org\/wiki\/Relay#Holding_circuit<\/a><br><a href=\"https:\/\/components.omron.com\/us-en\/products\/basic-knowledge\/relays\/basics\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/components.omron.com\/us-en\/products\/basic-knowledge\/relays\/basics<\/a><br><a href=\"https:\/\/chief-engineer.info\/sequence-control\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/chief-engineer.info\/sequence-control\/<\/a><br><a href=\"https:\/\/www.researchgate.net\/figure\/Self-holding-type-relay-system-Initial-state_fig1_274075718\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.researchgate.net\/figure\/Self-holding-type-relay-system-Initial-state_fig1_274075718<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e17\u0e33\u0e43\u0e2b\u0e49\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e22\u0e31\u0e07\u0e17\u0e33\u0e07\u0e32\u0e19\u0e15\u0e48\u0e2d\u0e41\u0e21\u0e49\u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e1b\u0e38\u0e48\u0e21\u0e2a\u0e15\u0e32\u0e23\u0e4c\u0e17 \u0e16\u0e49\u0e32\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e27\u0e07\u0e08\u0e23\u0e04\u0e07\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e15\u0e31\u0e27\u0e40\u0e2d\u0e07 = \u0e04\u0e38\u0e13\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08 \u201c\u0e1b\u0e23\u0e30\u0e15\u0e39\u0e41\u0e23\u0e01\u201d \u0e02\u0e2d\u0e07\u0e42\u0e25\u0e01\u0e2d\u0e2d\u0e42\u0e15\u0e40\u0e21\u0e0a\u0e31\u0e19<\/p>\n","protected":false},"author":2,"featured_media":400,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[8,34],"tags":[],"class_list":["post-398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-control-system","category-relay-circuit"],"_links":{"self":[{"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/posts\/398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=398"}],"version-history":[{"count":7,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/posts\/398\/revisions"}],"predecessor-version":[{"id":429,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/posts\/398\/revisions\/429"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=\/wp\/v2\/media\/400"}],"wp:attachment":[{"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.299engineering.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}