{"product_id":"g3mb-202p-solid-state-relay-5v-logic-100-240vac-2a-zero-cross","title":"G3MB-202P Solid State Relay — 5V Logic Input, 100–240VAC \/ 2A Output, Zero-Cross, Opto-Isolated","description":"\u003ch2\u003eG3MB-202P Solid State Relay — 5V Logic, 100–240VAC \/ 2A, Zero-Cross Switching\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOmron G3MB-202P\u003c\/strong\u003e is a miniature single-channel solid state relay (SSR) that switches \u003cstrong\u003e100–240VAC at up to 2A\u003c\/strong\u003e from a \u003cstrong\u003e5V logic control signal\u003c\/strong\u003e. Unlike electromechanical relays, the G3MB-202P has no moving parts — it switches silently, instantly, and with no contact wear. Built-in \u003cstrong\u003ephototriac coupler isolation\u003c\/strong\u003e provides electrical separation between the low-voltage control circuit and the mains AC load. \u003cstrong\u003eZero-cross switching\u003c\/strong\u003e minimizes electrical noise and inrush current by switching only at the AC waveform zero-crossing point.\u003c\/p\u003e\n\n\u003cp\u003eThe G3MB-202P is the SSR used in the majority of Chinese-made SSR relay modules. Available here as a standalone component for custom SSR circuit design, module repair, or direct integration into PCB designs.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Input 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\u003eLogic HIGH threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥4V\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≤1.0V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Input Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;14mA (directly drivable from MCU GPIO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput 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\u003eOutput 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\u003eMax Inrush Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30A (8.3ms)\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 (switches at AC waveform zero point)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePhototriac coupler (built-in opto-isolation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPST Normally Open (NO)\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\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24.5 × 20.5 × 5.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOmron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eSSR vs Electromechanical Relay — Key Differences\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eElectromechanical Relay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eG3MB-202P SSR (this)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMoving parts\u003c\/td\u003e\n\u003ctd\u003eYes (contacts wear over time)\u003c\/td\u003e\n\u003ctd\u003eNo (unlimited switching life)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching noise\u003c\/td\u003e\n\u003ctd\u003eAudible click\u003c\/td\u003e\n\u003ctd\u003eSilent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching speed\u003c\/td\u003e\n\u003ctd\u003e~10ms\u003c\/td\u003e\n\u003ctd\u003e~8.3ms (zero-cross)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC switching\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo (AC only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel operation\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo (do not parallel for higher current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax current\u003c\/td\u003e\n\u003ctd\u003e10A+ typical\u003c\/td\u003e\n\u003ctd\u003e2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWiring Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin 3 (+)\u003c\/strong\u003e → MCU GPIO (logic HIGH = relay ON). Draws \u0026lt;14mA — safe for direct GPIO connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin 4 (−)\u003c\/strong\u003e → GND (shared with MCU ground)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput terminals (1, 2)\u003c\/strong\u003e → In series with AC load and AC power source\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e When switching mains AC voltage, ensure all connections are properly insulated and inaccessible. The G3MB-202P body is not insulated — mount on an insulating surface or use an SSR module with enclosure.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Limitations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAC only\u003c\/strong\u003e — cannot switch DC voltages\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo parallel operation for higher current\u003c\/strong\u003e — SSRs do not share current equally; the first to turn on carries full load until it fails\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo dimming\u003c\/strong\u003e — zero-cross switching means ON\/OFF only, not phase-angle dimming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2A maximum\u003c\/strong\u003e — for higher current AC switching, use a larger SSR or electromechanical relay\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, small appliances ≤2A)\u003c\/li\u003e\n\u003cli\u003e3D printer heated bed control (12V DC bed — use electromechanical relay instead)\u003c\/li\u003e\n\u003cli\u003eAquarium heater and pump control\u003c\/li\u003e\n\u003cli\u003eHVAC zone valve control\u003c\/li\u003e\n\u003cli\u003eCustom SSR module design and PCB integration\u003c\/li\u003e\n\u003cli\u003eSSR relay module repair and component replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Omron G3MB-202P Solid State Relay\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45681462739179,"sku":"","price":6.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/G3MB-202P-Solid-State-Relay-2A.jpg?v=1723005910","url":"https:\/\/keszoox.com\/products\/g3mb-202p-solid-state-relay-5v-logic-100-240vac-2a-zero-cross","provider":"Keszoox","version":"1.0","type":"link"}