{"product_id":"40a-4-pin-spst-automotive-relay-12v-24v-car-electrical-switch","title":"40A 4-Pin SPST Car Relay 12V 24V | Automotive Electrical Switch","description":"\u003ch2\u003e40A 4-Pin SPST Automotive Relay – 12V \/ 24V\u003c\/h2\u003e\n\u003cp\u003eUpgrade or replace your vehicle's electrical switching with this dependable \u003cstrong\u003e40A SPST 4-Pin Automotive Relay\u003c\/strong\u003e. Rated for both 12V and 24V systems, it handles high-amperage circuits with ease — making it an ideal solution for a wide range of car electrical projects, from strobe and fog light wiring to remote start systems and air horns.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Voltage Compatible:\u003c\/strong\u003e Works with both 12V and 24V automotive electrical systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Current Rating:\u003c\/strong\u003e Handles up to 40 amps — perfect for power-hungry accessories\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSPST Contact Type:\u003c\/strong\u003e Single Pole Single Throw design for clean, reliable on\/off switching\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Pin Configuration:\u003c\/strong\u003e Standard layout for straightforward installation and wiring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built with plastic housing and metal contacts for long-lasting performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Suitable for car alarms, remote starts, HID headlights, strobe lights, fog lights, door\/trunk releases, stereos, fans, air horns, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes Cable:\u003c\/strong\u003e Comes with a relay cable for immediate use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12V \/ 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContact Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPST (Single Pole Single Throw)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Automotive Relay (Black)\u003c\/li\u003e\n  \u003cli\u003e1 × Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePhotos are for illustration purposes — please refer to the specifications above for exact dimensions.\u003c\/li\u003e\n  \u003cli\u003eSlight variations in measurements may occur due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eColors may vary slightly between different monitor displays.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/4-pack-deer-whistle-wildlife-alert-devices-vehicle\"\u003e4-Pack Deer Whistle Wildlife Alert Devices for Vehicles\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-pack-rubber-strain-relief-cord-boot-protector-sleeves-4-6-5-2-6mm\"\u003e10-Pack Rubber Strain Relief Cord Boot Protectors 4.6–6mm\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/waterproof-cable-gland-set-pg7-pg9-nylon-connectors-10-pack\"\u003e10-Pack Waterproof Cable Glands PG7 PG9 Nylon Connectors\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.fueleconomy.gov\/feg\/drive.shtml\" target=\"_blank\" rel=\"noopener\"\u003eFuelEconomy.gov driving efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this automotive relay compatible with both 12V and 24V vehicles?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, this 4-pin SPST relay is rated for use in both 12V and 24V automotive electrical systems, making it suitable for cars, trucks, SUVs, and larger commercial vehicles.\u003c\/p\u003e\n\u003ch4\u003eQ: What types of accessories can this 40A relay be used for?\u003c\/h4\u003e\n\u003cp\u003eA: This relay is ideal for high-amperage accessories such as strobe lights, fog lights, HID headlights, car alarms, remote start systems, air horns, stereos, cooling fans, and door or trunk release mechanisms.\u003c\/p\u003e\n\u003ch4\u003eQ: What does SPST mean for an automotive relay?\u003c\/h4\u003e\n\u003cp\u003eA: SPST stands for Single Pole Single Throw — this means the relay controls a single circuit and provides a simple on\/off switching function, making installation and wiring straightforward for most automotive electrical projects.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this automotive relay compatible with both 12V and 24V vehicles?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, this 4-pin SPST relay is rated for use in both 12V and 24V automotive electrical systems, making it suitable for cars, trucks, SUVs, and larger commercial vehicles.\"}}, {\"@type\": \"Question\", \"name\": \"What types of accessories can this 40A relay be used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This relay is ideal for high-amperage accessories such as strobe lights, fog lights, HID headlights, car alarms, remote start systems, air horns, stereos, cooling fans, and door or trunk release mechanisms.\"}}, {\"@type\": \"Question\", \"name\": \"What does SPST mean for an automotive relay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"SPST stands for Single Pole Single Throw — this means the relay controls a single circuit and provides a simple on\/off switching function, making installation and wiring straightforward for most automotive electrical projects.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/sdf9i0-k1.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Car Lights \u0026 Electrical\", \"item\": \"https:\/\/sdf9i0-k1.myshopify.com\/collections\/car-lights-electrical\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"40A 4-Pin SPST Car Relay 12V 24V | Automotive Electrical Switch\", \"item\": 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