Secheron UR46-81S, Инструкция по эксплуатации, Страница: 10 / 68

Introduction UR46-81/82S
Document number: SG104148TEN Revision: B01 Issue date: 20.8.2012
Copyright© 2012 Sécheron SA - This document is not contractual and contains information corresponding to the level of technology at the date of release.
A-10
File: a-UR46-8S_Intr_en.fm
A.1.3 Main features
• High insulation level to earth and between main contact
• High breaking and making capacity
• Long service life
• Simple maintenance
• Small dimensions
A.1.4 Functions
Closing
When a closing pulse is received, the closing device (1) moves the fork (2), which closes the
moving contact (3) and applies the contact pressure to the main contacts (3 & 9). The pusher (4),
pushed by the moving contact (3), actuates the auxiliary contacts (5). The closing force is
absorbed by the shock absorber (6).
Holding
Once the main contact is closed, the contact pressure is maintained by the closing device (1),
either with a reduced holding current (E type) or with a permanent magnet (M type).
Opening
The circuit-breaker opens either through an over-current release or through an appropriate
opening order:
• An over-current that exceeds the maximum current setting value, causes the direct release
rod (7) to move up, which lifts (8) the fork (2), thus releasing the moving contact (3).
• Opening the breaker on remote order cuts off the holding current of the closing device
(E type) or applies a reverse current pulse (M type), which causes the fork (2) to retract.
The pusher (4) then opens the moving contact (3) and actuates the auxiliary contacts (5).
The arc generated between the main contacts (3 & 9) moves upwards between the horns (11)
into the arc chute (10) and is split by the baffles (12). The ionized gases are mostly neutralised
between the de-ionizing plates (13).
03649-S
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