MOS Output Solid State Relays (SSRs) are the most reliable, technically advanced logic-to-power interface devices available. Their basic function is to take a low current signal from a microprocessor to control the switching of both AC and DC loads, while providing an isolation barrier between logic and power.

While this function is common to all relays, SSRs provide distinct advantages over their mechanical counterparts including:

MOSFET Output SSRs operate by taking a low level input current (<5mA) that energizes an input Infrared LED, which is optically-coupled to a Photo-diode array chip. This IC in turn generates a photo voltage that powers two MOSFETs typically connected in a source-to-source configuration, allowing for both AC and DC output loads. Since SSRs basically move photons to accomplish their switching function, they incur no mechanical wear and tear, providing consistent reliable switching.

These advantages make MOS Output SSRs the ideal choice for: