{"product_id":"irhapsody-12v-dc-spst-automotive-relay-kit-pack-of-6-40a-contacts-harnessed","title":"iRhapsody 12V DC SPST Automotive Relay Kit, Pack of 6 — 40A Contacts, Harnessed","description":"\u003cp\u003e\u003cstrong\u003eThe iRhapsody 4-pin 12V DC relay kit is a set of six SPST automotive relays with harnesses engineered to switch up to 40A at 14V and handle a wide range of automotive control tasks.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit supplies six identical 12V relays and matching wiring harnesses so you can quickly replace worn relays or build new circuits for lights, fans, pumps, or accessory power. Each relay uses a nominal 12 VDC coil with 1.8 W coil power and 80 Ω resistance, and the parts are specified for long operational life and robust electrical isolation. The pack is intended for hobbyists, mechanics, and installers who need reliable switching components rated for typical vehicle environments.\u003c\/p\u003e\n\n\u003ch3\u003eHow reliable are these relays for frequent switching?\u003c\/h3\u003e\n\n\u003cp\u003eThe relays are rated for extensive electrical and mechanical cycles to suit repeated on\/off use. Electrical life is specified at 100,000 operations under rated switching conditions; mechanically the relay is designed for up to 10 million cycles, showing the device can tolerate many actuations before wear becomes a concern.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eElectrical life: 100,000 operations (at 30 operations\/minute)\u003c\/li\u003e\n  \u003cli\u003eMechanical life: 10,000,000 operations\u003c\/li\u003e\n  \u003cli\u003eOperate time ≈ 7 ms; release time ≈ 5 ms for responsive switching\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat electrical load and environment can these relays handle?\u003c\/h3\u003e\n\n\u003cp\u003eEach relay is a single pole single throw (SPST) normally open contact rated for 40A at 14V DC, allowing switching of high-current accessories within the stated limits. The dielectric and insulation figures indicate good separation between coil and contacts, and the part is specified to function across common automotive temperature and humidity ranges.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eContact rating: NO 40A at 14V DC; max switching power 560 W\u003c\/li\u003e\n  \u003cli\u003eTemperature range: -30°C to +80°C; humidity tolerance 40%–85%\u003c\/li\u003e\n  \u003cli\u003eDielectric strength: 500 VAC between open contacts; 750 VAC between contact and coil\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I size these relays in my electrical projects?\u003c\/h3\u003e\n\n\u003cp\u003eChoose these relays for circuits where the continuous current and inrush demands remain reasonably below the 40A contact rating, and aim to leave a safety margin to extend relay life. The kit’s harnesses and wire gauges are selected for high-current paths and coil control leads; keep wiring lengths and terminal quality in mind to reduce voltage drop and heating.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eRecommended practice: operate 10–15% below maximum rated current for longevity\u003c\/li\u003e\n  \u003cli\u003ePrimary harness leads use 12 AWG tinned copper suitable for high-current loads\u003c\/li\u003e\n  \u003cli\u003eCoil leads use 16 AWG for reliable control signal delivery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the control voltages and switching characteristics?\u003c\/h3\u003e\n\n\u003cp\u003eThe relays are designed around a 12 VDC coil with defined operate and release thresholds that fit typical vehicle electrical systems. They will actuate and release quickly, and their coil and contact resistances are specified to help you design predictable control circuits and fuses.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNominal coil voltage: 12 VDC; coil power: 1.8 W; coil resistance: 80 Ω\u003c\/li\u003e\n  \u003cli\u003eMust operate voltage: 6–8 VDC; must release voltage: 0.6–3.6 VDC\u003c\/li\u003e\n  \u003cli\u003eMaximum applied coil voltage: 15.6 VDC; contact resistance ≤100 mΩ (at 6 VDC, 1 A)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: installers, DIY mechanics, vintage car restorers, and electronics builders who need multiple matched relays with harnesses for powering lights, electric fans, pumps, auxiliary batteries, or aftermarket accessories. This pack gives you six ready-to-use relays so you can standardize replacements or outfit several circuits at once without sourcing individual parts.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can these relays handle automotive starter currents?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — they are rated 40A continuous at 14V and are best for accessories; starter motors often draw much higher inrush currents.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the harnesses ready for direct vehicle connection?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — each relay includes a harness with 12 AWG primary leads and 16 AWG coil wires for direct installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"iRhapsody","offers":[{"title":"Default Title","offer_id":48086986555550,"sku":"B07X1R18QS","price":30.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/irhapsody-relay-front-view_17c70fde-3600-4d87-a3c1-b767cc6306fc.jpg?v=1785912289","url":"https:\/\/northtrailauto.ca\/products\/irhapsody-12v-dc-spst-automotive-relay-kit-pack-of-6-40a-contacts-harnessed","provider":"North Trail Auto","version":"1.0","type":"link"}