5V Bistable Flip-Flop Latch Relay Module – Self-Locking Switch
5V Bistable Flip-Flop Latch Relay Module – Self-Locking Switch
5V Bistable Flip-Flop Latch Relay Module — Self-Locking Switch Board (3-Pack)
Take control of your Arduino projects, smart home setups, LED lighting, and motor circuits with this compact 5V Bistable (Self-Locking) Flip-Flop Latch Relay Module. This 3-piece set delivers a reliable, ultra-low standby power solution for any maker, hobbyist, or electronics engineer who needs a toggle-style relay that holds its state without continuous power draw.
What Makes It Bistable?
Unlike standard relays that require a constant signal to stay engaged, this bistable (self-locking) design remembers its last state. One low pulse trigger pulls the relay in — and it stays latched. A second pulse releases it — and it stays released. No signal, no wasted power. Just clean, reliable switching.
Key Specifications
- Working Voltage: DC 5V
- Working Current: 70 mA
- Standby Current: Only 1 µA (ultra-low power)
- Load Capacity: AC 250V / 10A | DC 30V / 10A
- Trigger Mode: Low Pulse Trigger
- Dimensions: 35mm × 16mm × 18.5mm (L × W × H) — Miniature footprint
- Weight: 13.5 g per module
- Package Contents: 3× 1-Channel DC 5V Self-Locking Relay Module
Module Interface Pins
- VCC — Positive power supply
- GND — Negative power supply (ground)
- T — Low pulse trigger input
Relay Output Terminals
- NO — Normally Open relay interface
- COM — Common relay interface
- NC — Normally Closed relay interface
How It Works
By default, the relay starts in the released (open) state. Press the trigger once → relay latches ON. Press again → relay releases OFF. Press a third time → relay latches ON again. This toggle behavior repeats indefinitely with each low pulse trigger signal, making it perfect for hands-free or single-button control.
Typical Applications
- Arduino & MCU development boards
- Smart home automation systems
- LED lighting control
- DC motor switching
- Automotive electronics
- Emergency lighting systems
- Toy cars and remote-controlled vehicles
Made in Mainland China.
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What does "bistable" or "self-locking" mean for this relay module?
A: A bistable relay module holds its switched state without needing a continuous signal. One low pulse trigger causes the relay to latch into the ON position and stay there; a second pulse switches it to the OFF position and holds it there. This makes it ideal for low-power applications where you don't want continuous current drawn just to maintain a relay state.
Q: Is this 5V bistable relay module compatible with Arduino and Raspberry Pi?
A: Yes! The module operates at DC 5V, which is natively compatible with Arduino boards. It can also be used with Raspberry Pi and other 3.3V microcontrollers by using a small level-shifting circuit, since the trigger input accepts low pulse signals. It is widely used in smart home, LED, motor, and MCU projects.
Q: What load can this relay module switch?
A: Each relay module supports up to AC 250V / 10A for AC loads and DC 30V / 10A for DC loads, making it suitable for controlling lights, small motors, and other general-purpose electrical loads — all from a compact 35mm × 16mm board.
Q: How many modules are included in one purchase?
A: Each purchase includes 3 × 1-Channel DC 5V Self-Locking Bistable Relay Modules, giving you excellent value for prototyping or multi-circuit 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.