Bistable Relay Module 5V/12V Self-Locking Start-Stop Switch
Bistable Relay Module 5V/12V Self-Locking Start-Stop Switch
Bistable Relay Module – 5V/12V Single-Button Self-Locking Start-Stop Switch with Key Control
Take full control of your car modification or DIY electronics project with this compact Bistable Relay Module. 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.
Key Features
- Bistable (Self-Locking) Operation: One press activates the relay; a second press deactivates it — the circuit holds its state without continuous power to the coil.
- Dual Voltage Support: Compatible with both 5V and 12V DC power supplies, ideal for automotive and electronics projects.
- Low-Level Trigger: Activates on a low-level signal for seamless integration with microcontrollers and external buttons.
- 10A Maximum Output Current: The relay output can handle up to 10A — suitable for a wide range of loads. Do not exceed 10A on the controlled circuit.
- Onboard Key & External Button Support: Use the built-in board key or wire up an external button for remote switching flexibility.
- Status Indicator LED: An onboard LED lights up when the relay is energized, giving you instant visual feedback.
- Reserved Solder Pads for External LED: Easily add an external indicator light using the pre-reserved welding position on the board.
- Safe Power-On Default: On power-up, the relay always starts in the OFF state — preventing unintended activation.
- Normally Open (NO) & Normally Closed (NC) Terminals: Choose the configuration that suits your circuit needs.
- Compact Size: 52.8mm × 32mm × 18mm — easy to fit in tight spaces.
Specifications
| Operating Voltage | 5V / 12V DC |
| Trigger Type | Low-Level |
| Max Output Current | 10A |
| Module Size | 52.8mm × 32mm × 18mm |
| Output Terminals | Normally Open (NO) & Normally Closed (NC) |
| Indicator | Onboard LED + Reserved External LED Pads |
| Control Input | Onboard Key or External Button |
| Condition | New |
| Country of Origin | Made in China |
What's Included
- 1 × Bistable Relay Module (5V/12V)
Ideal For
- Car modification & automotive accessory control
- DIY electronics and home automation projects
- Arduino, Raspberry Pi, and microcontroller builds
- Custom start-stop switching circuits
- Remote-controlled or key-controlled relay applications
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Frequently Asked Questions
Q: What is a bistable relay module and how does it work?
A: 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.
Q: Does this relay module support both 5V and 12V systems?
A: 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).
Q: What is the maximum current the relay output can handle?
A: 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.
Q: Can I use an external button instead of the onboard key?
A: 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.
Q: What state is the relay in when power is first applied?
A: 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.
Production & Packaging Notice
To 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.