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
A solid state relay (SSR) allows you to control high-curent AC loads from lower voltage DC control circuitry. Solid state relays have several advantages over mechanical relays. More Details...
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Shipping from $9.90
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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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Shipping from $12.90
Code: SKU-000009
These are high quality Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage and/or high current devices.This relay's coil is rated up to 12V with a minimum switching voltage of 5V. More Details...
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Code: SKU-000831
These are massive single pole - double throw (SPDT) sealed relays. This means that when current is applied to the coil it throws a simple changeover switch terminating the connection from the NC contact to ground and closing the NO contact. More Details...
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Code: SKU-002310
Your 5V system can wield great power with this big beefy relay board. How does 10A on the NC contacts and 20A on the NO contacts at 220VAC sound? The SparkFun Beefcake Relay Control Kit contains all the parts you need to get your high-power load under control. More Details...
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Code: SKU-006518
The SparkFun Qwiic Dual Solid State Relay is a power delivery board that allows users to switch two AC loads from a low-power microcontroller using Qwiic! More Details...
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Code: SKU-005288
The SparkFun Qwiic Single Relay provides the easiest-to-use relay yet, handling up to 5.5A at 240VAC for extended periods. More Details...
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