Siemens Sentron 3VA Manual page 165

Shunt Trip Left (STL)
Shunt trips of type STL can be fitted in the left-hand accessory compartment as an
alternative to an undervoltage release. The units are available with six rated voltages in the
following range:
● 24 to 600 V AC 50/60 Hz
● 12 to 250 V DC
They have a maximum power consumption of 58 VA which is significantly lower than the
power consumption of the flexible shunt trip versions.
Switches (permanent signal) or momentary push-buttons (minimum signal duration 40 ms)
may be used to control shunt trips.
Shunt Trip Flexible (STF)
Shunt trips of type STF can be installed in the left and right (3VA6 only) accessory
compartment. They are therefore suitable for combining different auxiliary releases in one
switch.
The following rated voltage is available:
● 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 Release (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 breaker cannot be closed until the voltage applied to the UVR
reaches 85% of its rated value.
The units are available with rated voltages in the following range:
● 24 to 480 V AC 50/60 Hz
● 12 to 250 V DC
Universal Release (UNI)
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. A single component with minimal footprint can therefore perform both
functions.
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
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
Accessories
4.2 Internal accessories
163