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Technical overview
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M-PACT Plus
Cable/busbar earthing device
All M-PACT Plus circuit breakers can be fi tted with an earthing
device. It has a short circuit fault capacity equal to the Icw
rating of the breaker. This permits either the feeder cables or
the busbar to be safety held at earthed potential and locked
during system maintenance operations.
Carriage position switch
Available as an optional device for mounting within
the base of the cassette, this switch provides six single
pole changeover contacts for local or remote electrical
indication of the circuit breaker status: Connected, Test and
Disconnected.
The Disconnected position is indicated only when minimum
isolating distances between contacts on both the main and
auxiliary circuits have been achieved.
This option is in addition to the mechanical indicators which
are fi tted as standard.
When installed, the carriage switch is IP2X protected and
includes wiring to a terminal block located on the left-hand
side of the cassette.
Note: The carriage position switch is an option only suitable
for withdrawable circuit breakers.
Cluster contacts
These are the main isolating contacts which are fi tted to the
rear terminals on the moving portion of the withdrawable
unit.
As part of standard inspection and maintenance procedures,
cluster contacts have been designed to be easily and quickly
removed and replaced using universal cluster pliers.
2/3 way cable mechanical interlocks
Available for fi xed and withdrawable circuit breakers.
These units enable the direct interlocking of M-PACT Plus
circuit breakers, either mounted side-by- side or stacked.
The interlocking mechanisms are connected by a specially
designed cable in '1 from 3' OR '2 from 3' configuration,
and any mix of current ratings / pole confi gurations can be
accommodated.
Standard cable lengths available: 1.6, 2.0, 3.0, 4.0 metres.
(Please contact our technical customer service department if
longer length is required.)
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