ABB Vmax 12, Инструкция по установке и обслуживанию, Страница: 17 / 36

DISTRIBUTION SOLUTIONS 17 17
-MBU
2
1
3 9
10
8
7
6
11
5
4
6.1. Safety indications
Vmax circuit breakers guarantee a minimum IP2X degree of protection when installed in the
following conditions:
• fixed circuit breaker, installed behind a protective metallic net
• withdrawable circuit breaker, installed in switchgear.
Under these conditions the operator is totally guaranteed against accidental contact with
moving parts.
Should mechanical operations be carried out on the circuit breaker outside the switchgear,
be very careful of the moving parts.
If the operations are prevented, do not force the mechanical interlocks and check that the
operating sequence is correct.
Racking the circuit breaker in and out of the switchgear must be done gradually to avoid
shocks which may deform the mechanical interlocks.
Fig. 6
6.2. Operating and signalling parts
Undervoltage release mechanical
override (on request)
Undervoltage release activated.
The circuit breaker can only be
closed if the undervoltage release
is supplied with power.
Undervoltage release disabled.
The circuit breaker can be closed
even if the undervoltage release is
not supplied.
Caption
1 Key lock (if provided) (*)
2 Lever for manually charging the closing springs.
3 Coupling lever for racking-out operation (only for withdrawable circuit breakers).
4 Opening pushbutton.
5 Closing pushbutton.
6 Signalling device for circuit breaker open/closed.
7 Signalling device for closing springs charged/discharged.
8 Operation counter.
9 Handles for operating the truck locks (only for withdrawable circuit breakers).
10 Operating lever for circuit breaker racking-in/out.
11 Undervoltage release mechanical override (on request).
(*) Warning! To activate the key lock: open the circuit breaker, keep the opening pushbutton
depressed, then turn the key and remove it from the housing.
—
6. Instructions for operating the circuit breaker