Solid State Relays (SSRs) and Solid State Contactors (SSCs) are ideal for controlling dynamic loads such as motors, especially in applications that require frequent or repeated start/stop cycles. Selecting the correct SSR/SSC to reliably start and stop a motor for a specific application requires an understanding of the motor and solid state control application requirements. Many Sensat | Crydom solid state relays and contactors offer motor control ratings in horsepower (hp) or kilowatts (kW), simplifying the selection process, however, SSRs with only universal ratings can also be used for motor control.
NOTE: Solid State Relays (SSRs) and Solid State Contactors (SSCs) perform essentially the same, 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 an equivalent solid state relay with a general purpose power rating may or may not also have a motor control rating. Other than the evaluation (testing) and power rating matching process, there is no difference between solid state relays with and without motor HP ratings.
This white paper discusses the process of 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: May-26-2025