74
8
28
31.5
31.6
31.9
31.16
31.2
31.3
31.4
6.2.3 Circuit-breaker - type VM1
The maintenance-free VM1 circuit-breaker applies a combination of moulded-in vacuum interrupters,
a magnetic actuator and an electronic controller without auxiliary switches and with sensors.
Before connecting the primary voltage:
• Connect the auxiliary voltage. OFF command (closed – circuit release) and the closing lock-out must
be energized before the circuit-breaker can be closed;
The auxiliary voltage has been established when the (Ready) LED 31.2 lights up (figure 120).
• Carry out the closing and opening test of the circuit-breaker by pressing pushbuttons 31.3 and 31.4;
• Closing:
- by remote control via closing contacts or locally by pressing ON pushbutton 31.3;
• Opening:
- by remote control via closing contacts or locally by pressing OFF pushbutton 31.4;
• Opening on failure of the auxiliary power supply:
- Electrical opening is still possible within the first 200s;
- After a period of 200s, emergency manual opening is necessary;
- Insert emergency manual operating lever 28 onto the spigot of the emergency shaft 8 in the front
plate and turn it anticlockwise to open the circuit-breaker. Just before the final stop is reached, a
slight resistance on the emergency shaft has to be overcome.
• Closing on failure of the auxiliary power supply:
- Closing is not appropriate and not possible;
• After each operating cycle (ON-OFF), the operating cycle counter 31.5 increases by one full digit.
On termination of a switching operation, the position indicator 31.6 in the window of the front plate
displays the relative switch position.
• Anti-pumping system:
- The circuit-breaker controller ensures that circuit-breaker closing is locked when an opening
command is active;
- When closing on a subsequent opening command, further closing with the closing command still
active is locked. The closing command must be given again for the next closing operation.
For details, refer to the user’s manual.
Figure 120: Withdrawable part with VM1 type circuit-breaker - operating mechanism side
8 Recess for emergency manual opening lever
28 Emergency manual opening lever
31.2 “Ready” display
31.3 ON pushbutton
31.4 OFF pushbutton
31.5 Mechanical operating cycle counter
31.6 Mechanical switch position indicator
31.9 Catch for emergency manual operating lever
31.16 Front cover plate
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