Test facility boosts circuit breakers
A
Rockwell Automation product story
Edited by the Engineeringtalk editorial team
Mar 25, 2002
Rockwell Automation has enhanced its Allen-Bradley 140M motor protective circuit breaker with an innovative addon unit that enables the protective devices and associated circuitry to be tested.
Rockwell Automation has enhanced its Allen-Bradley 140M motor protective circuit breaker, with the introduction of an innovative addon 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, the operator is able to check the operation of associated control circuits without its motor operating.
Clearly this eliminates any risk to the process (equipment) and its operatives - especially important during setup, commissioning and maintenance.
Simple removal of the central carrier on the unit enables a maintenance electrician to disconnect the circuit allowing safe working on the motor and its associated equipment.
These features are extremely unusual in a unit of this size (44 x 45mm) and cost from less than GBP 10 net.
Unlike the combination of fuse-switch, contactor and overload relay traditionally required to provide motor protection, the 140M offers both short-circuit and overload protection in a single unit.
Combined with an Allen-Bradley 100-C contactor, the 140M provides cost-effective motor protection and control within 20% less panel space.
The 140M motor protective circuit breaker is part of the Allen-Bradley MCS (modular control system) range.
Rated up to 45A, it provides Type 2 short circuit co-ordination to IEC947-4-1, without specifying an oversized contactor.
It provides levels of protection and minimum fault ratings comparable with fuse-switches at a similar price, as well as offering a number of important added advantages such as immediate reusability after interruption, switching of all poles and separate indication of thermal overload and short-circuit.
"Now, with the addition of the test unit, the 140M is able to provide everything a fuse-switch can offer and more", says Rockwell Automation product manager Jeff Stewart.
"There is no reason to specify a traditional fuse-switch over the modern circuit-breaker technology represented by the 140M".
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