A wide range of optional accessories have been developed that are compatible with all M-PACT air circuit breakers, regardless of nominal rating or frame size. Each one incorporates 'easy-fit' design features for quick installation,
either in the factory or by the user on site.
Motorised spring charging unit
Motorised spring charging unit
The unique motor/gearbox unit is specially designed to operate with the full range of M-PACT breakers .It is easily fitted with just two bolts. In the event of circuit breaker closure, this unit will automatically recharge the spring in readiness for instant re closure should the need arise. High speed recharging ensures that the springs are fully charged within approximately three seconds following a release. As an optional feature, a "springs charged" contact is available for the motor unit.
Circuit breaker closing coil
The closing coil is an easy-to-fit, clip-on unit, with simple plug-in connectors. This permits either local or remote release of the spring charged closing mechanism by electrical operation. An additional anti-pumping safety feature also ensures that the electrical closing signal must be released before further closure is attempted, and a cut-off is instigated should a closing signal be maintained. Because each coil operates within a wide voltage range, the number of individually rated coils required is drastically reduced.
Shunt trip
Energisation , locally or remote, will instantaneously activate the circuit breaker mechanism, ensuring rapid disconnection of the main contacts. In addition, a series connected auxiliary switch ensures automatic isolation whenever the circuit breaker is open. Shunt trip releases also have a wide operational voltage range, and they include the same easy-fit, clip-on/plug-in connectors as the closing coil above.
Energisation , locally or remote, will instantaneously activate the circuit breaker mechanism, ensuring rapid disconnection of the main contacts. In addition, a series connected auxiliary switch ensures automatic isolation whenever the circuit breaker is open. Shunt trip releases also have a wide operational voltage range, and they include the same easy-fit, clip-on/plug-in connectors as the closing coil above.
Undervoltage release
Instantaneously releases the circuit breaker trip mechanism should the supply voltage dip below the pre -set value. Simple to install, these devices have the same easy-fit features as previously described. Note: This is a 'no-volt/ no-close device. The circuit breaker cannot be closed (manually or electrically) unless the under voltage release coil is energised. Time delay under voltage release similar to the above, but this electronic device prevents nuisance tripping of the circuit breaker if circuit interruption is not desirable when supply voltage drop is only transient. Fixed time delay 3 sec ±1sec.
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