{"product_id":"fotek-ssr-40la-h-solid-state-relay-40a-ac-control-module","title":"FOTEK SSR-40LA-H 40A Solid State Relay | AC Control Module","description":"\n\u003ch2\u003eFOTEK SSR-40LA-H Solid State Relay – Reliable AC Load Switching\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eFOTEK SSR-40LA-H Solid State Relay\u003c\/strong\u003e is a high-performance, 40-amp AC control module designed for industrial and DIY electrical applications. Solid state relays offer silent, spark-free switching with no mechanical contacts — making them ideal for automation systems, temperature controllers, industrial machinery, and electronics projects requiring dependable load switching.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e40A Load Current Rating\u003c\/strong\u003e – Handles demanding AC loads with ease\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolid State Design\u003c\/strong\u003e – No moving parts for longer service life and silent operation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlastic Enclosure\u003c\/strong\u003e – Lightweight yet durable housing for easy installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with FOTEK \/ Yangming SSR-40LA-H\u003c\/strong\u003e – Direct replacement or spare part\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Control Input\u003c\/strong\u003e – Easily driven by PLCs, microcontrollers, and DC signal sources\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpto-Isolated Input\u003c\/strong\u003e – Protects sensitive control circuitry from the high-voltage load side\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SSR-40LA-H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand Compatibility:\u003c\/strong\u003e FOTEK \/ Yangming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLoad Current:\u003c\/strong\u003e 40A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePID Temperature Controllers\u003c\/li\u003e\n  \u003cli\u003eIndustrial Automation \u0026amp; PLC Systems\u003c\/li\u003e\n  \u003cli\u003eHeating Element Control\u003c\/li\u003e\n  \u003cli\u003e3D Printer Heated Bed Control\u003c\/li\u003e\n  \u003cli\u003eMotor Soft-Start Circuits\u003c\/li\u003e\n  \u003cli\u003eDIY Electronics \u0026amp; Maker Projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafety Note\u003c\/h3\u003e\n\u003cp\u003eThis relay is intended for use by qualified individuals familiar with electrical installation and safety practices. Always follow applicable electrical codes and standards when wiring high-voltage loads. For workplace electrical safety guidance, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety resource\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster | Wall Art\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/everything-is-fine-trust-government-mens-graphic-t-shirt-cotton\"\u003e\"Everything Is Fine\" Funny Men's Graphic T-Shirt | Cotton Tee\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the SSR-40LA-H Solid State Relay compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The SSR-40LA-H is designed as a FOTEK \/ Yangming compatible solid state relay module. It is commonly used with PID temperature controllers, PLCs, Arduino and Raspberry Pi automation setups, and industrial control panels that require a 40-amp AC switching relay.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the advantage of a solid state relay over a mechanical relay?\u003c\/h4\u003e\n\u003cp\u003eA: Solid state relays (SSRs) have no mechanical contacts, which means they switch silently, generate no electrical arcing, and have a significantly longer operational lifespan compared to traditional electromechanical relays. They are also faster-switching and more resistant to vibration.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need a heat sink with the SSR-40LA-H?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — for loads approaching the 40A rating, a suitable aluminum heat sink is strongly recommended to dissipate heat generated during switching and ensure reliable long-term performance. Mounting the relay directly to a metal panel or DIN rail enclosure can also assist with heat management.\u003c\/p\u003e\n\u003ch4\u003eQ: What control signal does this solid state relay accept?\u003c\/h4\u003e\n\u003cp\u003eA: The SSR-40LA-H typically accepts a low-voltage DC control signal (commonly 3–32V DC) on its input side, making it directly compatible with most PLC outputs, microcontrollers, and dedicated SSR driver boards.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the SSR-40LA-H Solid State Relay compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The SSR-40LA-H is designed as a FOTEK \/ Yangming compatible solid state relay module. It is commonly used with PID temperature controllers, PLCs, Arduino and Raspberry Pi automation setups, and industrial control panels that require a 40-amp AC switching relay.\"}}, {\"@type\": \"Question\", \"name\": \"What is the advantage of a solid state relay over a mechanical relay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Solid state relays (SSRs) have no mechanical contacts, which means they switch silently, generate no electrical arcing, and have a significantly longer operational lifespan compared to traditional electromechanical relays. They are also faster-switching and more resistant to vibration.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need a heat sink with the SSR-40LA-H?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — for loads approaching the 40A rating, a suitable aluminum heat sink is strongly recommended to dissipate heat generated during switching and ensure reliable long-term performance. 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