Versions Of The Trip Units; Thermal-Magnetic Trip Units - Siemens Sentron 3VA Manual

Applications
3.1 Use of the 3VA UL molded case circuit breakers in line protection
3.1.2

Versions of the trip units

3.1.2.1

Thermal-magnetic trip units

TMTUs for line protection applications
Derating
Thermal-magnetic trip units employ a temperature-dependent bimetal to provide overload
protection. The setting values are calibrated at an ambient temperature of +40 °C.
Compensation factors must be applied for ambient temperatures greater than +50 °C.
You will find more information and derating factors in chapter Derating (Page 454).
Thermal-magnetic trip unit TM210 LI
Line protection FTFM - function LI
The thermal-magnetic trip unit TM210 has:
● Fixed parameter setting I
● Fixed parameter setting I
102
for overload protection (L)
r
for instantaneous short-circuit protection (I)
i
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01