Accessories
4.2 Internal accessories
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
205
Shunt trips of type STF can be fitted in the left-hand and the right-hand (3VA2 only)
accessory compartment. They are therefore suitable for combining different auxiliary
releases in one switch.
The units are available with six rated voltages in the following range:
● 24 to 600 V AC 50/60 Hz
Due to their design, their power consumption ranges up to maximum 750 VA and is therefore
higher than the power consumption of STL versions.
Undervoltage releases UVR
Undervoltage releases trip the molded case circuit breaker in the event that the rated voltage
fails or drops to between 70% and 35% of its normal value (in compliance with the relevant
standard).
The main contacts of the basic breaker cannot be reclosed until the voltage applied to the
UVR reaches 85% of its rated value. The breaker main contacts cannot close until the UVR
rated voltage reaches this level.
The units are available with rated voltages in the following range:
● 24 to 480 V AC 50/60 Hz
● 12 to 250 V DC
A universal release is a single, 21 mm wide component in which a shunt trip and an
undervoltage release are combined. These are subject to the same tripping conditions as the
individual devices. Both functions can therefore be performed at the same time with a
minimal footprint.
The three available rated voltages are identical in each case for both the shunt trip and the
undervoltage release. These rated voltages are:
● 12 V DC
● 24 V DC
● 48 V DC
To Next Page
Loading...
