{"product_id":"hrs1h-s-dc5v-miniature-pcb-relay-5v-coil-3a-spdt-125-250vac","title":"HRS1H-S-DC5V Miniature PCB Relay — 5V Coil, 3A SPDT, 125\/250VAC, 0.1″ Pitch, Through-Hole","description":"\u003ch2\u003eHRS1H-S-DC5V — Miniature PCB Relay, 5V Coil, 3A SPDT, 125\/250VAC\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHRS1H-S-DC5V\u003c\/strong\u003e is a miniature SPDT electromechanical relay with a \u003cstrong\u003e5V DC coil\u003c\/strong\u003e, rated to switch up to \u003cstrong\u003e125\/250VAC or 24VDC at 3A\u003c\/strong\u003e (90W maximum). Its six pins are spaced on standard \u003cstrong\u003e0.1″ (2.54mm) centers\u003c\/strong\u003e, making it directly compatible with perfboard and prototype PCBs. This is the relay used in the majority of Chinese-made solid state relay modules and relay breakout boards — available here as a standalone component for custom relay circuit design, module repair, or homebrew switching applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant power limit:\u003c\/strong\u003e Maximum switching power is 90W total. At 110VAC, maximum current is 0.8A. At 12VDC, full 3A is available. At 24VDC, full 3A is available.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40mA @ 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnergize Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥3.75V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelease Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContact Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPDT (NO + NC + COM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitching Voltage (AC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125V \/ 250V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitching Voltage (DC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24V DC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitching Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Switching Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin Spacing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1″ (2.54mm) — perfboard compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15.6 × 10.6 × 11.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHKE (Hongfa \/ HRS series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePinout (viewed from pin side \/ bottom)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOM\u003c\/strong\u003e — Common contact. Connect to load power source or ground. Two COM pins are provided; only one needs to be connected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNC\u003c\/strong\u003e — Normally Closed. Connected to COM when relay is de-energized. Opens when relay energizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNO\u003c\/strong\u003e — Normally Open. Disconnected from COM when relay is de-energized. Closes when relay energizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOIL (2 pins)\u003c\/strong\u003e — Connect one to 5V, other to ground (or transistor collector). Pins are interchangeable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDriving the Relay from a Microcontroller\u003c\/h3\u003e\n\u003cp\u003eThe relay coil draws \u003cstrong\u003e40mA at 5V\u003c\/strong\u003e — exceeding the 20–40mA maximum of most MCU GPIO pins. \u003cstrong\u003eDo not drive directly from Arduino or ESP32 GPIO.\u003c\/strong\u003e Use a small NPN transistor (2N3904, 2N2222, PN2222A) as a driver:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMCU GPIO → 2.2KΩ base resistor → transistor base\u003c\/li\u003e\n\u003cli\u003eTransistor collector → relay coil pin\u003c\/li\u003e\n\u003cli\u003eRelay coil other pin → 5V\u003c\/li\u003e\n\u003cli\u003eTransistor emitter → GND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlyback diode (1N4148 or 1N4001)\u003c\/strong\u003e across coil pins (cathode to 5V side) — protects transistor from back-EMF when relay de-energizes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLogic HIGH on MCU pin → transistor saturates → relay energizes. Logic LOW → relay de-energizes.\u003c\/p\u003e\n\n\u003ch3\u003eInductive Load Protection\u003c\/h3\u003e\n\u003cp\u003eWhen switching inductive DC loads (motors, solenoids), add a \u003cstrong\u003eflyback diode (1N4001 or larger)\u003c\/strong\u003e directly across the load terminals to prevent contact welding when the relay de-energizes.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCustom relay breakout board design (homebrew relay module)\u003c\/li\u003e\n\u003cli\u003eRelay module repair and replacement\u003c\/li\u003e\n\u003cli\u003eLow-current AC switching (lamps, fans, small appliances up to 90W)\u003c\/li\u003e\n\u003cli\u003e12V\/24V DC load switching (solenoids, motors, LED strips)\u003c\/li\u003e\n\u003cli\u003eArduino and ESP32 relay driver circuits (with transistor driver)\u003c\/li\u003e\n\u003cli\u003eIndustrial control panel relay replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × HRS1H-S-DC5V Miniature PCB Relay (5V coil, 3A SPDT, through-hole)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e\u003ca href=\"http:\/\/www.hankukrelay.co.kr\/eng\/img\/product\/hke\/pdf\/HRS1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eHRS1H-S-DC5V Datasheet (HKE PDF)\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45681461919979,"sku":"","price":4.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/HRS1H-S-DC5V-3A-Relay.jpg?v=1723005919","url":"https:\/\/keszoox.com\/products\/hrs1h-s-dc5v-miniature-pcb-relay-5v-coil-3a-spdt-125-250vac","provider":"Keszoox","version":"1.0","type":"link"}