{"product_id":"srd-05-12-24vdc-5pin-10a-relay-srd-sl-c-spdt-pcb-mount-electromagnetic","title":"SRD-05\/12\/24VDC 5-Pin 10A Relay | SRD-SL-C | DC Electromagnetic Switch | SPDT | PCB Mount","description":"\u003ch2\u003eSRD-05\/12\/24VDC 5-Pin 10A Relay — SRD-SL-C | SPDT | PCB Mount | DC Electromagnetic Switch\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSRD series 5-pin PCB mount relay\u003c\/strong\u003e is the most commonly used general-purpose relay in Arduino relay modules, home automation controllers, and industrial control circuits. The SPDT (Single Pole Double Throw) contact configuration provides both normally-open (NO) and normally-closed (NC) switching in a single relay, enabling both make-on-energise and break-on-energise circuit configurations. Available in 5V, 12V, and 24V coil voltage versions to match your control circuit supply voltage. Rated for AC 250V\/10A and DC 30V\/10A load switching — suitable for mains lighting, motors, heaters, and DC loads.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSRD-SL-C (SRD series)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V DC \/ 12V DC \/ 24V DC (as selected)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContact Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPDT (1 Form C: NO + NC + COM)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 pins (2 coil + 3 contact)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax AC Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 250V \/ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax DC Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 30V \/ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMount Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCB mount (DIP, through-hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePin Configuration (5-Pin SRD)\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003ePin\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin 1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCoil − (negative)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin 2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCoil + (positive)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin 3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCOM (common contact)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin 4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNC (normally closed — connected to COM when relay OFF)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin 5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNO (normally open — connected to COM when relay ON)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eSPDT Contact Configuration — How to Use\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eContact\u003c\/th\u003e\n\u003cth\u003eRelay OFF (coil de-energised)\u003c\/th\u003e\n\u003cth\u003eRelay ON (coil energised)\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCOM – NO\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOpen (circuit broken)\u003c\/td\u003e\n\u003ctd\u003eClosed (circuit made)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCOM – NC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClosed (circuit made)\u003c\/td\u003e\n\u003ctd\u003eOpen (circuit broken)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eUse COM–NO for “normally off, switch on” applications (e.g., turn on a light when relay activates). Use COM–NC for “normally on, switch off” applications (e.g., fail-safe circuits that open on relay activation).\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSPDT configuration\u003c\/strong\u003e — both NO and NC contacts available for maximum circuit flexibility\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eAC 250V \/ 10A load rating\u003c\/strong\u003e — switches mains lighting, motors, and heaters\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDC 30V \/ 10A load rating\u003c\/strong\u003e — switches DC motors, solenoids, and high-current DC loads\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e5V \/ 12V \/ 24V coil options\u003c\/strong\u003e — matches Arduino (5V), automotive (12V), and industrial (24V) control voltages\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePCB mount DIP package\u003c\/strong\u003e — direct PCB soldering, compatible with standard relay module PCBs\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSRD-SL-C series\u003c\/strong\u003e — the standard relay used in widely-available Arduino relay module boards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino relay module replacement relay\u003c\/li\u003e\n  \u003cli\u003eHome automation mains switching (lights, fans, appliances)\u003c\/li\u003e\n  \u003cli\u003eIndustrial control panel relay\u003c\/li\u003e\n  \u003cli\u003eMotor starter and contactor auxiliary relay\u003c\/li\u003e\n  \u003cli\u003eAlarm system output relay\u003c\/li\u003e\n  \u003cli\u003eAutomotive relay (12V version)\u003c\/li\u003e\n  \u003cli\u003eHVAC control relay\u003c\/li\u003e\n  \u003cli\u003eCustom relay board design\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCoil Drive Requirements\u003c\/h3\u003e\n\u003cp\u003eThe relay coil requires sufficient current to energise reliably:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eCoil Voltage\u003c\/th\u003e\n\u003cth\u003eCoil Resistance (typical)\u003c\/th\u003e\n\u003cth\u003eCoil Current (typical)\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5V\u003c\/td\u003e\n\u003ctd\u003e~70Ω\u003c\/td\u003e\n\u003ctd\u003e~70mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e12V\u003c\/td\u003e\n\u003ctd\u003e~400Ω\u003c\/td\u003e\n\u003ctd\u003e~30mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003ctd\u003e~1600Ω\u003c\/td\u003e\n\u003ctd\u003e~15mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eArduino GPIO pins are limited to 40mA. Always drive relay coils via a transistor or relay driver IC (e.g., ULN2003) — do not connect relay coils directly to Arduino GPIO pins.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I connect this relay directly to an Arduino GPIO pin?\u003c\/strong\u003e\u003cbr\u003eA: No. The 5V relay coil draws ~70mA, exceeding the Arduino GPIO pin’s 40mA limit. Use a transistor (e.g., 2N2222, BC547) or a relay driver module with optocoupler isolation to drive the relay from an Arduino GPIO pin.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is a flyback diode required?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Always connect a flyback diode (e.g., 1N4007) across the relay coil terminals (cathode to positive, anode to negative) to suppress the back-EMF spike when the relay de-energises. Most relay module boards include this diode.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× SRD-SL-C 5-Pin PCB Mount Relay (coil voltage as selected: 5V \/ 12V \/ 24V)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"5V","offer_id":46985521856747,"sku":"14:1202#5V","price":5.68,"currency_code":"USD","in_stock":true},{"title":"12V","offer_id":46985521889515,"sku":"14:350852#12V","price":5.8,"currency_code":"USD","in_stock":true},{"title":"24V","offer_id":46985521922283,"sku":"14:351074#24V","price":5.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/srd-05-12-24vdc-5pin-10a-relay-sldc.webp?v=1761275741","url":"https:\/\/keszoox.com\/products\/srd-05-12-24vdc-5pin-10a-relay-srd-sl-c-spdt-pcb-mount-electromagnetic","provider":"Keszoox","version":"1.0","type":"link"}