{"product_id":"solid-state-relay-module-5v-1-channel-ssr-100-240vac-2a-zero-cross-arduino","title":"Solid State Relay Module 5V — 1-Channel SSR, 100–240VAC \/ 2A, Zero-Cross, Active-Low, Arduino","description":"\u003ch2\u003eSolid State Relay Module — 5V, 1-Channel SSR, 100–240VAC \/ 2A, Zero-Cross Switching\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1-channel solid state relay (SSR) module\u003c\/strong\u003e switches \u003cstrong\u003e100–240VAC at up to 2A\u003c\/strong\u003e from a \u003cstrong\u003e5V active-LOW logic signal\u003c\/strong\u003e — no moving parts, no audible click, no contact wear. Built on the Omron G3MB-202P SSR with built-in \u003cstrong\u003ephototriac coupler isolation\u003c\/strong\u003e and \u003cstrong\u003ezero-cross switching\u003c\/strong\u003e, this module is the clean, silent alternative to electromechanical relay modules for controlling AC loads up to ~220W. An onboard \u003cstrong\u003e2A fuse\u003c\/strong\u003e provides over-current protection on the AC output side.\u003c\/p\u003e\n\n\u003cp\u003eThe module is \u003cstrong\u003eactive-LOW\u003c\/strong\u003e: driving CH1 LOW energizes the SSR (red LED ON, AC output connected). Logic HIGH or no connection de-energizes the SSR. The input draws \u0026lt;1mA — directly drivable from any Arduino, ESP32, or Raspberry Pi GPIO pin.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-cross switching\u003c\/strong\u003e — switches at AC waveform zero point, minimizing electrical noise and inrush current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhototriac coupler isolation\u003c\/strong\u003e — built-in opto-isolation between MCU logic and AC load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive-LOW control\u003c\/strong\u003e — LOW = SSR ON; HIGH = SSR OFF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u0026lt;1mA GPIO drive\u003c\/strong\u003e — safe for all MCU GPIO pins, no driver transistor needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2A onboard fuse\u003c\/strong\u003e — AC-side over-current protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed LED indicator\u003c\/strong\u003e — illuminates when SSR is energized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReverse polarity protection\u003c\/strong\u003e — diode on DC power input\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew terminal connections\u003c\/strong\u003e — for both DC control and AC load wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4–6V DC (5V typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~10mA when SSR energized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Logic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive-LOW (LOW = SSR ON)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLogic HIGH threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;3.1V (when Vcc = 5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLogic LOW threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGPIO Current Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAC Output Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e75–264VAC (recommended: 100–240VAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAC Output Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1–2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitching Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZero-cross\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitching Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery half-cycle (~8.3ms @ 60Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOnboard Fuse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2A (AC side, soldered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSSR Component\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOmron G3MB-202P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e3.3V Compatibility Note\u003c\/h3\u003e\n\u003cp\u003eThis module is \u003cstrong\u003e5V logic optimized\u003c\/strong\u003e. The logic HIGH threshold to turn the SSR OFF is ~3.1V when Vcc = 5V. A 3.3V MCU GPIO may or may not reach this threshold reliably — adding a pull-up resistor on the CH1 line to 3.3V improves reliability. If Vcc is reduced below 5V, the HIGH threshold scales proportionally.\u003c\/p\u003e\n\n\u003ch3\u003eWiring Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDC control screw terminal (3-pin):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC+\u003c\/strong\u003e → 4–6V DC supply (5V typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC−\u003c\/strong\u003e → GND (shared with MCU ground)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCH1\u003c\/strong\u003e → MCU GPIO (LOW = SSR ON)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAC load screw terminal (2-pin, non-polarized):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOne terminal → AC mains hot lead (incoming)\u003c\/li\u003e\n\u003cli\u003eOther terminal → Load hot lead (outgoing to load)\u003c\/li\u003e\n\u003cli\u003eAC neutral connects directly to load (not through relay)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAC safety:\u003c\/strong\u003e When switching mains voltage, ensure all AC connections are properly insulated and enclosed. Mount in a suitable electrical enclosure with terminal strips for safe AC wiring.\u003c\/p\u003e\n\n\u003ch3\u003eSSR vs Electromechanical Relay Module\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSR (this):\u003c\/strong\u003e Silent, no moving parts, unlimited switching life, zero-cross switching reduces EMI — best for frequent switching, noise-sensitive environments, and long-life applications up to 2A AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectromechanical relay module:\u003c\/strong\u003e Audible click, mechanical wear, can switch DC and higher AC currents (10A+) — best for infrequent switching and higher current loads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eArduino \/ ESP32 AC mains switching (lamps, fans, heaters up to ~220W @ 110V)\u003c\/li\u003e\n\u003cli\u003eTerrarium automation — heat lamp, mister, fan, UV light control\u003c\/li\u003e\n\u003cli\u003eAquarium heater and pump control\u003c\/li\u003e\n\u003cli\u003eChristmas and decorative lighting control\u003c\/li\u003e\n\u003cli\u003eHVAC zone valve and damper control\u003c\/li\u003e\n\u003cli\u003e3D printer heated bed control (12V DC bed — use electromechanical relay instead)\u003c\/li\u003e\n\u003cli\u003eEscape room and prop automation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Solid State Relay Module 5V (1-channel, 100–240VAC \/ 2A, zero-cross, active-low)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45681477746923,"sku":"","price":9.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/Solid-State-Relay-Module-1-x-5V_a3f8d2f1-1635-44a6-bb96-b449b0a8e8ca.jpg?v=1723005861","url":"https:\/\/keszoox.com\/products\/solid-state-relay-module-5v-1-channel-ssr-100-240vac-2a-zero-cross-arduino","provider":"Keszoox","version":"1.0","type":"link"}