Adafruit
Adafruit Mini Relay FeatherWing - Latching
The Adafruit Latching Mini Relay FeatherWing lets you control mains-powered devices and small appliances using any Feather microcontroller. Switch lamps, fan...
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The Adafruit Latching Mini Relay FeatherWing lets you control mains-powered devices and small appliances using any Feather microcontroller. Switch lamps, fans, solenoids, and other loads rated up to 250 VAC or DC — all from a compact FeatherWing form factor.
This is the latching version, which uses two control pins (SET and UNSET). A brief 10 ms pulse on either pin latches the relay open or closed, saving power between switching events. The relay retains its last state even if power is lost. Attach it to your Feather using Feather Stacking Headers.
Key Features
- Latching Relay – Pulse SET or UNSET for 10 ms to toggle; retains state without power
- Flexible Switching – Up to 2 A at 30 VDC / 40 VAC, 0.5 A at 120 VAC, or 0.6 A at 250 VAC (60 W max recommended)
- Two-Pin Control – Dedicated SET and UNSET GPIO pins for reliable latching operation
- Screw Terminal Block – 3-pin terminal included for easy load wiring
- Feather Compatible – Works with any Feather board via standard header connection
- Pre-Assembled PCB – Light soldering required to attach the included header
Ideal For
- Home automation and IoT switching
- Low-power applications where the relay must hold state without continuous current
- Controlling lamps, fans, solenoids, and small appliances (up to 60 W)
- Battery-powered projects where power conservation matters
Package Contents
- 1× Latching Mini Relay FeatherWing (assembled and tested)
- 1× 3-pin terminal block
- 1× Header strip (requires soldering)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- FeatherWing
- A FeatherWing is an add-on board made to plug into the Feather microcontroller board layout. Knowing a product is a FeatherWing helps you check whether it will physically and electrically fit your Feather-style mainboard.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- Terminal block
- A terminal block is a connector that joins wires together in a neat, removable, or serviceable way, usually clamping each wire under a screw or spring instead of soldering. It makes it easier to connect, change, or service wiring without permanent joints.
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