At a minimum this would include a thermal overload relay.

I'd feel a sight more than silly if that overload relay popped while I was a couple thousand feet up.

A simple overload relay is arranged to trip open the contactor in the event of trouble on the overhead.

For overloaded conditions, motors are protected with thermal overload relays.

There are two types of thermal overload relay.

The overload relay has a normally closed contact which opens due to heat generated by excessive current flowing through the circuit.

New contactors and overload relays have to meet more than just the basic functions of switching and protection.

The overload relay opens a set of contacts that are wired in series with the supply to the contactor feeding the motor.

Electronic digital overload relays containing a microprocessor may also be used, especially for high-value motors.

Full protection, short circuit and overload is achieved using other protective devices such as overload relays.

The Nov. 9, 1965 blackout began with an overloaded relay at a hydroelectric plant in Ontario.

A second type of thermal overload relay uses a eutectic alloy, like a solder, to retain a spring-loaded contact.

Where the overload relay is exposed to the same environment as the motor, a useful though crude compensation for motor ambient temperature is provided.

Features include, intake air filtration, compressor overload relays, fan motor protection, anti-frost thermostat and large capacity condensate containers.

External current transformers are required to handle current loads above 90A up to 540 FLA for separate overload relays.

Darkness blinked in and out on the bridge as consoles erupted into flames and sparks showered down from overloaded relays in the overhead.

Overloaded relays sent sparks flying throughout the bridge and threw Kim, Lasren, and Oden to the deck.

They are protected from electrical surges by various protective units: a fast-acting circuit breaker, an overload relay, a differential relay, etc.

Featured Product: Motor Logic Plus Solid State Overload Relay.

Larger motors have a protective overload relay or temperature sensing relay included in the controller and fuses or circuit breakers for over current protection.

By using a DeviceNet network devices such as the 193-E3 electronic overload relay, the user has access to diagnostics and fault finding information from the plant floor.

Its line of products includes disconnect switches, contactors, overload relays, pilot lights, push buttons, terminal blocks, general purpose relays, and many other similar products.

Routine: (frequency of occurrence normally greater than 1 year) overload relay adjustments, transformer oil testing, phase/ circuit balancing, lamp and ballast replacement on burn-out, etc.

Overload relays may rely on heat produced by the motor current to operate a bimetal contact or release a contact held closed by a low-melting-point alloy.

Motor control contactors can be fitted with short-circuit protection (fuses or circuit breakers), disconnecting means, overload relays and an enclosure to make a combination starter.