ABB K-Line Plus, Installation And Maintenance Instructions Manual

Page: 52 / 65

K - L i n e P l u s
45
C
IRCUIT
B
REAKERS
Circuit breakers ship separately. The factory installs blocks in the
movable parts of breakers with under-voltage release.
On each switchgear all circuit breakers of like rating are
interchangeable unless the secondary (control) circuit requires
otherwise.
Circuit breakers have three positions in the housing.
1.
The DISCONNECT position disengages the main and control
disconnecting devices on the breaker. They are a safe distance
from the stationary part of the devices located on the housings.
2.
The TEST position disengages the main disconnecting devices,
and engages the control contacts. This position allows operation
of the circuit breaker for testing.
3.
The CONNECTED position engages the main and control
disconnecting devices on the breaker.
Mechanical interlocks prevent moving a circuit breaker from one
position to another unless the breaker is open. The interlocks also
prevent closing the breaker between positions.
For handling, inserting and removing circuit breakers, refer to
IB6.2.11.1-1A, Installation/Maintenance Instructions for Low Voltage
Power Circuit Breakers.