The 5V Sugar Cube Relay acts as an electrically operated switch that allows low-power devices to safely control much higher voltage or current circuits. It provides complete electrical and galvanic isolation between the fragile control side and the high-power load side.
Internal Mechanics
The housing contains an internal copper electromagnetic coil, a spring-loaded armature, and heavy-duty electrical contacts. When a 5V DC signal flows through the coil, it generates a magnetic field. This field pulls the internal armature down, mechanically shifting the main contact from its resting position to its active position.
Pin Configuration (5-Pin Layout)
The relay features a standard 5-pin through-hole footprint layout on its bottom face:
- Coil Pins (Pin 1 & Pin 2): Connected to the internal electromagnet. These receive the 5V DC control trigger. They have no polarity, meaning current can flow in either direction.
- Common (COM / Pin 3): The primary terminal where the source power for the load circuit is connected.
- Normally Closed (NC / Pin 4): The terminal connected to COM by default when the relay coil is unpowered. The circuit stays “ON” at rest.
- Normally Open (NO / Pin 5): The terminal that connects to COM only when the coil is powered (energised). The circuit turns “ON” when triggered.
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