The Siemens 3VA2450-5MN32-0BF0 is a 3-pole molded case circuit breaker from the 3VA2 series, built on an IEC frame 630 with breaking capacity class M. It carries a rated ultimate short-circuit breaking capacity Icu of 55 kA at 415 V AC, meaning it can safely interrupt fault currents up to that level without damage to itself or upstream devices — a key figure for panel selectivity studies. The breaker is fitted with an ETU350M electronic trip unit configured for motor protection with LSI characteristics: overload protection Ir adjustable from 200 A to 500 A, short-delay protection Isd from 3 to 15 times Ir, and instantaneous protection Ii fixed at 15 times In (500 A). This makes it suited for protecting medium-voltage motor feeders where coordination with downstream contactors and overloads is required.
Integration & Mounting
The breaker mounts on a DIN rail or can be screw-fixed to a backplate in a standard panel enclosure. It ships with a nut keeper kit for secure terminal connections on the line and load sides. An undervoltage release (24 V DC) is factory-fitted as an accessory, allowing remote tripping on loss of control voltage — common in safety circuits and emergency-stop chains. One auxiliary contact is also included for status feedback to a PLC or indication lamp.
Ratings in Context
The 55 kA Icu at 415 V is the rated ultimate short-circuit breaking capacity. The adjustable overload range is 200–500 A.