Motor protection circuit breakers act as protection devices for electric motors, monitoring the electrical supply in motor circuits of 50-60Hz. They protect against phase unbalances and losses, which are detrimental to motors, offer protection against current overload, and prevent short circuits.
What are motor protection circuit breakers used for?
Motor protection circuit breakers are useful in industrial and building applications such as chillers, compressors, heat pumps and cooling towers, to prevent damages from short circuits or power surges. In the manufacturing industry, circuit breakers interrupt electrical faults below the breaking capacity, which protects machinery and equipment from blowouts.
Types of motor protection circuit breakers
Motor protection circuit breakers come in A type or B type classifications, dependent on utilisation and function.
The A type breaker is not explicitly intended for selectivity and does not allow intentional short time delay under short circuit conditions.This means that the system interrupts immediately when current or voltage levels match the breaking capacity.
Type B breakers allow for an intentional and adjustable short time delay under short circuit conditions, which enables the system to continue for a short while with currents exceeding breaking capacity levels.
Description:
Low voltage squirrel-cage motor with aluminum frame are
suitable for a wide range of standard drive tasks in the industrial environment. Thanks to their particular low weight, they are predestined for applications in pumps, fans, compressors, conveyor systems and lifting ...
Description:
SIRIUS 3RM1 motor starters are compact devices 22.5
mm wide, combining a large number of functions in a single enclosure.They consist of combinations of relay contacts, power semiconductors (hybrid technology), and a solid-state overload relay for switching induction under normal ...
Description:
Modular Motor Protective Circuit Breakers designed for use
with add-on contactor modules and accessories which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range ...
Description:
Designed to be used in conjunction with the
Allen Bradley 100-C contactor range to provide type 2 co-ordination without oversizing of the contactor, in rating up to 22kW. The breaker may be customised to suit individual requirements. Trip Class 10Short ...
