Relays provide an electrically isolated way to switch low‑voltage control signals to high‑voltage or high‑current loads. Mechanical SPDT units offer a simple change‑over contact arrangement, often sealed to protect against dust and moisture, and are suited to applications such as motor control, lighting, or HVAC where a clear on/off state is required. Solid‑state versions use semiconductor switches, delivering faster response, longer life and no audible click, making them ideal for frequent cycling or environments where moving parts are undesirable. Both types are driven from modest coil voltages (typically 5–12 V) and can handle a wide range of load currents and voltages, from a few amps at low voltage to tens of amps at mains level. Integration options include terminal blocks, plug‑and‑play boards and I²C‑compatible modules, allowing straightforward connection to microcontrollers and embedded systems.
Code: SKU-001957
Switch current loads of up to 40A with a 3-32V DC input and a zero-cross trigger control method with this Solid State Relay. More Details...
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Code: SKU-006530
The SparkFun Qwiic Quad Solid State Relay Kit takes one of our favourite solid state relays and lets you place up to four of them on a single PCB to control all of them via I 2 C from your desired microcontroller. More Details...
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Code: SKU-005288
Control high-power AC loads (up to 5.5A at 240VAC) safely from your microcontroller using this easy-to-use, solderless I2C Qwiic relay board. More Details...
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Code: SKU-000831
A fully sealed, 220VAC @ 20A rated, SPDT relay. More Details...
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Code: SKU-006518
Switch two 25A AC loads safely from your microcontroller using this dual solid-state relay board, featuring simple I2C control and Qwiic connectors. More Details...
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Code: SKU-011352
Safely switch low-power loads and route signals over I2C using this Omron DPDT relay breakout, featuring low drive currents and plug-and-play Qwiic connectors. More Details...
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