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A-58
The Masterpact Earthing Switch can be racked into any
compatible Masterpact NW chassis in place of a
Masterpact circuit breaker. It is used to interconnect
and earth the phase and neutral conductors of an
electrical installation to ensure the safety of personnel
during servicing. It can be locked in earthed position.
Main characteristics
Rated insulation voltage
Rated operational voltage
Rated current
Latching capacity
Rated short-time withstand
current
1000 V
690 V
800 to 4000 A
135 kA peak
60 kA/1s
50 kA/3s
Compatibility
Compatible with drawout NW08 to NW40 circuit breakers, types
N1/H1/NA/HA, 3-pole and 4-pole rear connected versions
Remote indication
12 ON/OFF indication contacts that can be used according to
the chassis auxiliary wiring
PB104426A50
The Earthing Switch is compatible with Masterpact NW08 to NW40 type N1, H1,
NA and HA circuit breakers in both 3-pole and 4-pole versions. It has two parts:
a chassis earthing kit for installation on the Masterpact NW chassis. Two different
b
b
versions are available for 3-pole and 4-pole chassis.
the Earthing Switch itself, which is a specific Masterpact NW device that can be
b
b
racked into any chassis equipped with an earthing kit, in place of the circuit breaker.
Two versions are available (3-pole and 4-pole).
An earthing kit must be installed on the chassis of each circuit breaker protecting a
circuit that may require earthing while work is being carried out. However, a single
earthing switch is often sufficient for an entire installation if only one circuit is to be
serviced at any given time.
The standard Earthing Switch comes with the short-circuit bar installed across the
bottom (downstream) connections for earthing of the upstream portion of the circuit.
The user can easily move the short-circuit bar to the top connections if the
downstream portion of the circuit needs to be earthed.
Earthing kit
(for chassis)
Earthing switch
(front view)
DB125557
DB125558
Earthing switch
(rear view)
DB125559
DB125560
With short-circuit bar on the top connections.
With short-circuit bar on the bottom connections.
DB125561
Locking in earthed position by 3 padlocks
The standard Earthing Switch can be locked in earthed position by one to
three padlocks as long as the following conditions are satisfied:
the Earthing Switch must be in "connected" position in a chassis equipped with an
b
b
earthing kit
the Earthing Switch must be in “ON” position.
b
b
Under these conditions, the installation is earthed.
When the Earthing Switch is locked in earthed position:
it cannot be moved to "disconnected" position (a shutter prevents insertion of the
b
b
racking handle)
it cannot be turned "OFF" (a shutter prevents access to the "OFF" pushbutton).
b
b
Earthing switch Masterpact
Functions
and characteristics
version: 1.2
207E2510.indd