What this MCCB carries and where it fits
The Siemens 3VA2110-5MN36-0BC0 is a 3-pole IEC moulded-case circuit breaker on the 160 A frame, rated In=100 A with an ETU350M LSI electronic trip unit. The 'M' breaking capacity class delivers Icu=55 kA at 415 V — enough to handle high-fault industrial distribution without cascading upstream breakers. The undervoltage release (UVR) at 24 V DC means this unit drops the load on loss of control voltage, standard for emergency-stop or safety isolation circuits in motor control centres.
Trip unit and protection profile
The ETU350M provides LSI protection: long-time (Ir) adjustable 40 A to 100 A for overload, short-time (Isd) 3 to 15 x Ir for selective coordination, and instantaneous (Ii) fixed at 15 x In (1500 A) for bolted faults. This makes it a motor-protection breaker — the LSI curve matches motor start inrush while clearing faults fast enough to protect the feeder. The 24 V DC UVR coil holds in when the control supply is present; if the DC rail drops, the breaker trips immediately.