Thermal overload relays are protective devices. They are
designed to cut power if the motor draws too much current for an extended
period of time. To accomplish this, thermal overload relays contain a normally
closed (NC) relay. When excessive current flows through the motor circuit, the
relay opens due to increased motor temperature, relay temperature, or sensed
overload current, depending on the relay type. Thermal overload relays are
similar to circuit breakers in construction and use, but most circuit breakers
differ in that they interrupt the circuit if overload occurs even for an
instant. Thermal overload relays are conversely designed to measure a
motor's heating profile; therefore, overload must occur for an extended period
before the circuit is interrupted.
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