Solid State Relays (SSRs) and Solid State Contactors (SSCs) are ideal for controlling dynamic loads such as motors, especially when the application requires frequent or repeated start/stop cycles. Selecting the correct solid state relay/solid state contactor to reliably start and stop a motor for a specific application requires an understanding of the motor and solid state control application requirements. Motor control ratings are available for many Sensata | Crydom solid state relays and contactors in horsepower (hp) or kilowatts (kW), simplifying the selection process, but solid state relays with only universal ratings can also be used for motor control.
NOTE: Solid State Relays (SSRs) and Solid State Contactors (SSCs) perform similar, if not identical, functions. The difference between the two is that a “contactor” by definition must have a motor control rating in HP or kW, whereas a similar solid state relay with a general purpose rating may or may not also have a motor control rating. Other than the evaluation (testing) process and the approval of approved ratings, there is no difference between solid state relays with and without motor power ratings.
This white paper discusses the process to follow when selecting the correct solid state relay for motor control when the solid state relay power rating in horsepower (hp) or kilowatts (kW) is unknown or unavailable.
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Post time: Mar-11-2025