{"product_id":"bistable-relay-module-5v-12v-self-locking-start-stop-switch","title":"Bistable Relay Module 5V\/12V Self-Locking Start-Stop Switch","description":"\n\u003ch2\u003eBistable Relay Module – 5V\/12V Single-Button Self-Locking Start-Stop Switch with Key Control\u003c\/h2\u003e\n\u003cp\u003eTake full control of your car modification or DIY electronics project with this compact \u003cstrong\u003eBistable Relay Module\u003c\/strong\u003e. Operating on both 5V and 12V systems, this self-locking relay switch lets you toggle circuits on and off with a single button press — no need to hold the button down. Whether you're adding a custom kill switch, controlling accessories, or building an automation project, this module delivers clean, reliable switching in a tiny footprint.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBistable (Self-Locking) Operation:\u003c\/strong\u003e One press activates the relay; a second press deactivates it — the circuit holds its state without continuous power to the coil.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Voltage Support:\u003c\/strong\u003e Compatible with both 5V and 12V DC power supplies, ideal for automotive and electronics projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow-Level Trigger:\u003c\/strong\u003e Activates on a low-level signal for seamless integration with microcontrollers and external buttons.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10A Maximum Output Current:\u003c\/strong\u003e The relay output can handle up to 10A — suitable for a wide range of loads. Do not exceed 10A on the controlled circuit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard Key \u0026amp; External Button Support:\u003c\/strong\u003e Use the built-in board key or wire up an external button for remote switching flexibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Indicator LED:\u003c\/strong\u003e An onboard LED lights up when the relay is energized, giving you instant visual feedback.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReserved Solder Pads for External LED:\u003c\/strong\u003e Easily add an external indicator light using the pre-reserved welding position on the board.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSafe Power-On Default:\u003c\/strong\u003e On power-up, the relay always starts in the OFF state — preventing unintended activation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open (NO) \u0026amp; Normally Closed (NC) Terminals:\u003c\/strong\u003e Choose the configuration that suits your circuit needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Size:\u003c\/strong\u003e 52.8mm × 32mm × 18mm — easy to fit in tight spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse: collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e5V \/ 12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eTrigger Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eLow-Level\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eMax Output Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e10A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eModule Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e52.8mm × 32mm × 18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eOutput Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eNormally Open (NO) \u0026amp; Normally Closed (NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eIndicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eOnboard LED + Reserved External LED Pads\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eControl Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eOnboard Key or External Button\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Bistable Relay Module (5V\/12V)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCar modification \u0026amp; automotive accessory control\u003c\/li\u003e\n  \u003cli\u003eDIY electronics and home automation projects\u003c\/li\u003e\n  \u003cli\u003eArduino, Raspberry Pi, and microcontroller builds\u003c\/li\u003e\n  \u003cli\u003eCustom start-stop switching circuits\u003c\/li\u003e\n  \u003cli\u003eRemote-controlled or key-controlled relay applications\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: What is a bistable relay module and how does it work?\u003c\/h4\u003e\n\u003cp\u003eA: A bistable relay module (also called a self-locking relay) maintains its switched state without needing a continuous trigger signal. One button press closes the circuit; a second press opens it. This is different from a standard relay that returns to its default state when the trigger is removed. This makes it perfect for toggle on\/off applications like automotive accessories or DIY switches.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this relay module support both 5V and 12V systems?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This bistable relay module is compatible with both 5V and 12V DC power supplies, making it suitable for a wide range of projects including car modifications (12V) and microcontroller-based builds (5V).\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum current the relay output can handle?\u003c\/h4\u003e\n\u003cp\u003eA: The relay output terminals support a maximum of 10A. Make sure the device or circuit you are controlling does not draw more than 10A, or you risk damaging the module.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use an external button instead of the onboard key?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The module supports both the onboard key and an external button connection, giving you flexibility to place the control switch wherever is most convenient in your project or vehicle.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What state is the relay in when power is first applied?\u003c\/h4\u003e\n\u003cp\u003eA: Every time the module powers on, the relay starts in the OFF (open) state. This built-in safety feature prevents unintended activation of connected devices upon power-up.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a bistable relay module and how does it work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A bistable relay module (also called a self-locking relay) maintains its switched state without needing a continuous trigger signal. One button press closes the circuit; a second press opens it. This is different from a standard relay that returns to its default state when the trigger is removed. This makes it perfect for toggle on\/off applications like automotive accessories or DIY switches.\"}}, {\"@type\": \"Question\", \"name\": \"Does this relay module support both 5V and 12V systems?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. This bistable relay module is compatible with both 5V and 12V DC power supplies, making it suitable for a wide range of projects including car modifications (12V) and microcontroller-based builds (5V).\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum current the relay output can handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The relay output terminals support a maximum of 10A. Make sure the device or circuit you are controlling does not draw more than 10A, or you risk damaging the module.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use an external button instead of the onboard key?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely. 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