Medium Voltage Application Guide

13686.A
13686.A
13685.A
SWITCHGEAR
Single line diagram
Description
Withdrawable circuit breaker The withdrawable circuit breaker provides load switching, short
circuit protection and circuit isolation when opened and in the
draw-out position.
The cable-side earth switch is interlocked with the circuit breaker
and can only be closed when the circuit breaker is in the drawn-out
position.
A protection device is required to provide overload and short circuit
protection.
Withdrawable contactor The withdrawable contactor with integrated fuses provides load
switching and circuit isolation when opened and in the draw-out
position. The fuses provide short circuit protection.
The cable-side earth switch is interlocked with the contactor and
can only be closed when the contactor is in the drawn-out position.
Gas insulated rotary disconnector The gas insulated rotary disconnector has three physical operating
positions. It provides load switching in the ON position, isolation in
the OFF position and earthing in the EARTH position.
Short circuit protection is provided by fuses, but a fixed type circuit
breaker could be used instead.
710-12280-00A Medium Voltage Application Guide Page 101