The Siemens 3VA1450-7EE42-0AA0 is a 4-pole IEC frame 630 circuit breaker with a class C breaking capacity of 110 kA at 415 V. It carries a TM220 ATFM trip unit, with overload protection adjustable from 350 A to 500 A and fixed short-circuit protection set at 10 times the rated current (Ii = 10 x In). The N conductor is unprotected, and the unit ships with a nut keeper kit for panel mounting.
What the ratings mean for fit
The 110 kA Icu at 415 V means this breaker can safely interrupt fault currents up to that level without upstream fuses or cascading — critical for high-fault installations like transformer secondaries or large motor control centers. The TM220 thermal-magnetic trip provides inverse-time overload protection (Ir = 350–500 A) and instantaneous short-circuit protection at 5000 A (10 × 500 A). The 4-pole configuration with an unprotected neutral suits IT or corner-grounded delta systems where the neutral is not switched.