Rockwell Automation has enhanced its Allen-Bradley 140M motor protection
circuit breaker with the introduction of an add-on unit that enables the
protective devices and associated circuitry to be tested. The unit can be
fitted to the circuit breaker in three different positions, allowing
'on', 'locked off' or 'test' modes to be selected. In the 'test'
position, control circuits can be checked without the motor running.
Circuit disconnection is achieved simply by removing the central carrier
on the unit, allowing the maintenance technician to work on the equipment
in complete safety.
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