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Technical overview
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M-PACT Plus
Accessories
A wide range of optional accessories have been developed
that are compatible with all M-PACT Plus air circuit breakers,
regardless of nominal rating or frame size. Each one
incorporates 'easy-fi t' design features for quick installation,
either in the factory or by the user on site.
Motorised spring charging unit
The unique motor/gearbox unit is specially designed to
operate with the full range of M-PACT Plus 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 reclosure 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 instigat-ed 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.
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
undervoltage release coil is energised.
Time delay undervoltage 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.
Auxiliary trip combination
The M-PACT Plus circuit breaker can be equipped with the
following auxiliary trips or releases 1 x Shunt trip + 1 x Closing
coil + 1 x Undervoltage release or 1 time delay Undervoltage
release
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