Siemens SENTRON 3WA1 Manual page 237

Shunt trip (ST/ST-COM/ST2)
Up to two shunt trips make remote opening of the circuit breaker possible.
Remote opening can take place both via communication and by means of electrical
signals on the secondary disconnect terminal system.
The shunt trips are available in three versions:
• Shunt trip (ST) 100% OP, suitable for uninterrupted duty
This version is suitable for uninterrupted duty with an ON period (OP) of 100%.
– The release can be permanently connected to voltage.
– It locks out on momentary-contact commands, thus making it possible to set up
–
• Shunt trip (ST-COM) 100% OP, communication-capable, suitable for uninterrupted
duty
This version is suitable for uninterrupted duty with an ON period of 100% and for
switching via communication.
– The release can be permanently connected to voltage.
– It locks out on momentary-contact commands, thus making it possible to set up
–
• Shunt trip for momentary duty 5% OP, uninterrupted duty not possible
The shunt trip for momentary duty reduces the break time of the circuit breaker to
below 50 ms and is thus synchronizable. The ON period is 5%. This shunt trip is not
suitable for uninterrupted duty.
Note
Shunt trip ST2 and the undervoltage releases are mounted in the same location. It is not
possible to use these accessories simultaneously.
The shunt trips can be retrofit.
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
interlocks.
Shunt trip 220 - 250 V DC / 208 - 240 V AC can optionally be supplied with power
by means of a capacitor trip device during short-time failures of the supply
voltage, see Chapter Capacitor trip device for shunt trips (Page 243).
interlocks.
Shunt trip 220 - 250 V DC / 208 - 240 V AC can optionally be supplied with power
by means of a capacitor trip device during short-time failures of the supply
voltage, see Chapter Capacitor trip device for shunt trips (Page 243).
4.3 Control and signaling accessories
Accessories
235