Download Merlin Gerin Masterpact Earthing Switch

Low voltage products
059140
Merlin Gerin Masterpact
Earthing Switch
Contents
Typical applications
Functions and characteristics
Locking in earthed position by 3 padlocks
Dimensions and connection
Catalogue numbers
Typical applications
Earthing of one section of a coupled busbar
arrangement
When working on section B, the bus coupler is
normally open. To protect personnel in the event of
accidental closing of this device, an earthing switch
with the the upstream terminals earthed is installed in
place of the circuit breaker at B. In this way section B
will remain at earth potential under all circumstances
and the personnel can work in complete safety.
Application n°2
E79480
Application n°1
E79479
The earthing switch is used to protect maintenance
personnel working on an installation against the risk of
accidental connection of a parallel source or
energisation by reverse power. Protection is provided
by earthing the part of the installation that is to be
worked on.
Application n°3
Earthing of an MV/LV transformer
When working on an MV/LV transformer, upstream
earthing is carried out by means of the usual medium
voltage and high voltage procedures. Installation of an
earthing switch with the downstream terminals
earthed (in place of the circuit breaker at B) maintains
the part of the installation between the upstream MV
circuit breaker and the downstream LV circuit breaker
at earth potential. In this way, the personnel can work
in complete safety even if the rest of the installation is
energised.
2
E79481
Earthing an outgoer
When working on outgoer C, installation of an earthing
switch with the upstream terminals earthed
(in place of the circuit breaker at C) ensures complete
safety even if all the other devices on the installation
are closed.
Functions and characteristics
Earthing switch
(front view)
E79483
Earthing kit
(for chassis)
E79482
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.
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:
b a chassis earthing kit for installation on the
Masterpact NW chassis. Two different versions are
available for 3-pole and 4-pole chassis.
Earthing switch (rear view)
E79485
E79484
b the Earthing Switch itself, which is a specific
Masterpact NW device that can be 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 shortcircuit 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.
With short-circuit bar on the
bottom connections
Main characteristics
Rated insulation voltage
Rated operational voltage
Rated current
Latching capacity
Rated short-time withstand current
Compatibility
Remote indication
With short-circuit bar on the top
connections
1000 V
690 V
800 to 4000 A
135 kA peak
60 kA/1s
50 kA/3s
Compatible with drawout NW08 to
NW40 circuit breakers,
types N1/H1/NA/HA, 3-pole and
4-pole rear connected versions
12 ON/OFF indication contacts that
can be used according to the chassis
auxiliary wiring
The standard Earthing Switch can be locked in
earthed position by one to three padlocks as long
as the following conditions are satisfied:
E79486
Locking in earthed position
by 3 padlocks
b the Earthing Switch must be in “connected” position
in a chassis equipped with an earthing kit
b the Earthing Switch must be in “ON” position.
Under these conditions, the installation is earthed.
When the Earthing Switch is locked in earthed
position:
b it cannot be moved to “disconnected” position
(a shutter prevents insertion of the racking handle)
b it cannot be turned “OFF”
(a shutter prevents access to the “OFF” pushbutton).
3
E79487
E79488
Dimensions and connection
10
Y
40
X
77
F
239,5
Catalogue numbers
Earthing Switch
In (A at 40 °C)
NW08 to NW40
4000
Icm (kA peak for U = 220/690 V)
3P
4P
135
48430
48431
Earthing kit for chassis
3P
48433
4P
48434
ABTED397074EN © 2001 Schneider All rights reserved
NW08 to NW40 N1, H1, NA, HA
Schneider Electric Industries SA
5, rue Nadar
92506 Rueil-Malmaison Cedex France
Tel : +33 (0)1 41 29 82 00
Fax : +33 (0)1 47 51 80 20
As standards, specifications and designs change from time to time, please ask for
confirmation of the information given in this publication.
This document has been printed on ecological paper
http://www.schneiderelectric.com
ART 78401
Conception : Schneider Electric - AMEG
Impression :
04-2001