Bistable Relay Module 5V/12V/24V Single Button Self-Locking Switch
Bistable Relay Module 5V/12V/24V Single Button Self-Locking Switch
Bistable Relay Module – Single-Button Self-Locking Control Switch
Upgrade your electronics or automotive projects with this compact and versatile Bistable Relay Module. Designed for single-button toggle control, this self-locking relay module lets you switch circuits on and off with one press — no need to hold the button. Perfect for car start-stop modifications, DIY automation projects, and custom electronic builds.
Key Features
- Flexible Power Supply: Compatible with 5V, 12V, or 24V power inputs to suit a wide range of applications.
- One-Button Bistable Operation: Press once to engage the relay (pull in), press again to release (drop out). The relay returns to the OFF state when power is cycled.
- 10A Maximum Output Current: The relay's secondary output supports up to 10A — suitable for most standard automotive and electronic loads.
- Onboard & External Button Support: Use the built-in button on the PCB or connect an external button via the dedicated terminals.
- Low-Level Trigger Control: Triggered by a low-level signal (signal line grounded) for easy integration with microcontrollers and other control circuits.
- Status Indicator LED: Onboard LED indicator light shows relay state at a glance. Solder pads are also provided for an external indicator light.
- NO/NC Terminal Options: Connect to the Normally Open (NO) or Normally Closed (NC) terminal depending on your circuit requirements.
- Compact Form Factor: Dimensions: 52.8mm × 32mm × 18mm — easy to mount in tight spaces.
Specifications
| Supply Voltage | 5V / 12V / 24V (select appropriate version) |
| Trigger Type | Low-level signal (signal line to ground) |
| Relay Output Max Current | 10A |
| Module Dimensions | 52.8mm × 32mm × 18mm |
| Contact Type | Normally Open (NO) / Normally Closed (NC) |
| Indicator | Onboard LED + external indicator solder pad |
| Country of Origin | Made in China |
⚠️ Important Notices
- No Reverse Polarity Protection: Connecting the power supply with reversed polarity (negative connected incorrectly) will permanently damage the module. Always verify polarity before connecting power.
- Basic Electronics Knowledge Required: This module is intended for users with a foundational understanding of electronics and hands-on experience with circuit assembly. Please evaluate your skill level before purchasing.
- Actual color may vary slightly from product images due to monitor settings and lighting conditions.
- Please allow ±1–2cm measurement tolerance due to manual measurement methods.
Common Applications
- Automotive start-stop switch modifications
- DIY home automation control circuits
- Microcontroller (Arduino, Raspberry Pi) projects
- Industrial and hobbyist switching circuits
- Self-locking toggle switch replacement
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What voltages does this bistable relay module support?
A: This relay module supports three power supply options: 5V, 12V, and 24V. Be sure to select or wire the correct voltage version for your specific project to ensure reliable operation.
Q: What is the maximum current this relay module can handle?
A: The relay's secondary output is rated for a maximum of 10A. The load current of the controlled circuit or device must not exceed 10A to prevent damage to the module or the relay contacts.
Q: Can I use an external button with this bistable relay module?
A: Yes. In addition to the onboard push button, the module provides dedicated terminals for connecting an external button, making it easy to mount a remote switch or panel button in your project enclosure or vehicle.
Q: What happens to the relay state when power is cycled?
A: When power is disconnected and reconnected, the relay automatically resets to the OFF (released) state, regardless of its previous state. This ensures safe, predictable behavior on power-up.
Q: Is this relay module compatible with Arduino or Raspberry Pi?
A: Yes. The module uses a low-level trigger signal (signal line connected to ground), which is easily generated by GPIO pins on Arduino, Raspberry Pi, or other microcontroller platforms, making it ideal for DIY automation and electronics projects.
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.