{"product_id":"industrial-solid-state-relay-ssr-40da-40a-250v-3-32vdc-10-pack","title":"SSR-40DA Solid State Relay 40A 250V 3-32VDC | 10-Pack","description":"\n\u003ch2\u003eIndustrial Solid State Relay SSR-40DA — Reliable DC-to-AC Switching Power\u003c\/h2\u003e\n\u003cp\u003eUpgrade your industrial control systems with this \u003cstrong\u003eSSR-40DA Solid State Relay\u003c\/strong\u003e. Designed for demanding DC-input to AC-output switching applications, this relay delivers fast, silent, and spark-free operation — making it an ideal choice for automation panels, temperature controllers, CNC machinery, heating systems, and more. Available in multiple current ratings (10DA, 25DA, 40DA, 60DA) to match your exact load requirements.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications (SSR-40DA)\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 3–32V DC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 24–380V AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Current:\u003c\/strong\u003e 40A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOn Voltage:\u003c\/strong\u003e ≤1V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitch-On Time:\u003c\/strong\u003e ≤10ms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOff Leakage Current:\u003c\/strong\u003e ≤2mA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 10 × SSR-40DA Relays\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This SSR?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNo Moving Parts\u003c\/strong\u003e — Solid state design eliminates mechanical wear for longer service life\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFast Switching\u003c\/strong\u003e — Response time ≤10ms for precise control\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eLow EMI\u003c\/strong\u003e — Zero-crossing switching minimizes electromagnetic interference\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWide Input Range\u003c\/strong\u003e — Compatible with most PLCs, microcontrollers, and DC control signals (3–32V DC)\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHigh Load Capacity\u003c\/strong\u003e — Handles up to 40A output current at up to 380V AC\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePlug-and-Play Ready\u003c\/strong\u003e — Screw-terminal connections for quick, secure wiring\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eValue Pack\u003c\/strong\u003e — Comes as a 10-piece set, ideal for projects, spares, or bulk installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIndustrial automation and PLC control panels\u003c\/li\u003e\n  \u003cli\u003eHeating element and temperature controller circuits\u003c\/li\u003e\n  \u003cli\u003eMotor control and power switching\u003c\/li\u003e\n  \u003cli\u003e3D printer heated beds and CNC systems\u003c\/li\u003e\n  \u003cli\u003eHVAC and pump control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Current Ratings\u003c\/h3\u003e\n\u003cp\u003eChoose from \u003cstrong\u003e10DA, 25DA, 40DA, or 60DA\u003c\/strong\u003e versions to perfectly match your load requirements. Each shares the same 3–32V DC input and 24–380V AC output specifications.\u003c\/p\u003e\n\n\u003cp\u003eFor information on electrical safety standards and best practices for industrial control equipment, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eU.S. Occupational Safety and Health Administration (OSHA) — Electrical Safety\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does SSR-40DA mean and what does this solid state relay do?\u003c\/h4\u003e\n\u003cp\u003eA: SSR stands for Solid State Relay, and \"40DA\" indicates a 40-Amp DC-to-AC model. It allows a low-voltage DC control signal (3–32V DC) to switch a high-voltage AC load (24–380V AC, up to 40A) without any mechanical contacts — providing fast, silent, and long-lasting switching for industrial and automation applications.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this solid state relay compatible with Arduino, Raspberry Pi, or PLCs?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The 3–32V DC input range is directly compatible with most microcontrollers (including Arduino and Raspberry Pi GPIO pins with appropriate interfacing), PLCs, and other standard DC control sources, making integration into automation projects straightforward.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need a heat sink with this SSR?\u003c\/h4\u003e\n\u003cp\u003eA: At higher current loads (typically above 10A continuous), a heat sink is strongly recommended to dissipate heat and maintain reliable long-term performance. The relay's flat metal back is designed to mount directly onto an aluminum heat sink using thermal compound for optimal heat transfer.\u003c\/p\u003e\n\u003ch4\u003eQ: What is included in the package?\u003c\/h4\u003e\n\u003cp\u003eA: Each order includes 10 × SSR-40DA Solid State Relays (40A \/ 250V \/ 3–32V DC input). This value pack is ideal for bulk wiring projects, automation panels, or keeping spares on hand.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does SSR-40DA mean and what does this solid state relay do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"SSR stands for Solid State Relay, and \\\"40DA\\\" indicates a 40-Amp DC-to-AC model. 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