Siemens Sentron 3VA - Thermal-Magnetic Trip Unit; Thermal-Magnetic Trip Unit (TMTU); Application Cases and Trip Unit Types

Description
2.6 Thermal-magnetic trip unit
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
79
2.6
Thermal-magnetic trip unit
2.6.1
Thermal-magnetic trip unit (TMTU)
A thermal-magnetic trip unit consists of a thermal trip unit for protecting against overload,
and a magnetic trip unit for protecting against short circuits. Both trip units are series-
connected. Thermal-magnetic trip units are available with Fixed-Thermal-Fixed-Magnetic
(FTFM) or Fixed-Thermal-Adjustable-Magnetic (FTAM) settings.
2.6.2
Application cases and trip unit types
The table below illustrates the applications for which different types of thermal-magnetic trip
units can be used: