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Transcript
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