Basic HTML Version
14 12
11
mcb closed
mcb open
Ph
N
94 92
91
fault
normal
Ph
N
14
mcb closed
Ph
N
D
1
Ph
N
C
2
C
1
12
mcb open
U
<
D
2
U
>
14 12
11
mcb closed
mcb open
Ph
N
94 92
91
fault
normal
Ph
N
14
mcb closed
Ph
N
D
1
Ph
N
C
2
C
1
12
mcb open
U
<
D
2
U
>
4 12
1
osed
mcb open
Ph
N
94 92
1
l
Ph
N
14
closed
Ph
Ph
N
C
12
open
<
>
4 12
losed
mcb open
Ph
N
94 92
1
fault
r l
Ph
N
closed
Ph
1
Ph
N
2 1
pen
U
2
U
9/7
For C60/C120 MCBs
Auxiliary ON/OFF switch (OF), Alarm switch (SD),
Shunt trip unit (MX), Under voltage release (MN)
Electrical
auxiliaries
Dimensions
Section 10
Auxiliary ON/OFF switch (OF) to indicate the ‘open’ or
‘closed’ position of a circuit breaker
Assembly
Clip on the left side of the circuit breaker.
Applications
Audible or visual indication of the open or closed state of the circuit. The indication
can be given on the front of a cubicle or enclosure or grouped on a control desk.
Can be used in conjunction with an alarm switch.
Alarm switch (SD) to indicate circuit breaker opening on
a fault (tripped)
Assembly
Clip on the left side of the circuit breaker.
Applications
Audible or visual indication of a fault on an electrical circuit in air conditioned
rooms, passenger and goods lifts, ventilation etc. May be used in conjunction with
an auxiliary ON/OFF switch.
Shunt trip unit (MX) for remote tripping
Assembly
Clip on the left side of the circuit breaker.
Applications
Remote opening of electrical circuits.
Under voltage release unit (MN) to ensure automatic
tripping in case of under voltage and for remote tripping
by EMERGENCY STOP push button
Assembly
Clip on the left side of the circuit breaker.
Applications
Automatic tripping of a circuit breaker whenever the voltage drops sufficiently
below its nominal rated voltage. Remote tripping of a circuit breaker by ‘emergency
stop’ or other N.C. push button.