The Siemens 3VA1150-5EF36-0AD0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 55 kA breaking capacity at 415 V, class M. It ships with a TM240 thermal-magnetic trip unit, adjustable overload protection from 35 A to 50 A, and short-circuit pickup adjustable from 5 to 10 times In. The clamp connection terminals and three factory-fitted HQ auxiliary switches make this a line-protection breaker ready for panel wiring.
What the ratings mean for your panel
The 55 kA Icu at 415 V is the ultimate breaking capacity — the breaker can safely interrupt a fault up to that current once and remain functional. In a 400 V industrial distribution board, that puts it in the medium-high range for IEC frame 160 hardware; it coordinates well downstream of a larger-frame feeder without requiring a current-limiting fuse upstream. The adjustable Ir (35–50 A) lets you match the thermal pickup to the actual continuous load rather than the fixed In, so you can run the breaker at 40 A on a 45 A circuit without nuisance tripping.
Deployment context
The 3VA1 frame mounts on a DIN rail or panel plate in a standard IEC distribution enclosure. The clamp connection terminals accept copper or aluminum conductors without lug kits — speeds up panel wiring for OEMs and retrofit jobs. The three HQ auxiliary switches give remote status feedback (open/closed/tripped) without adding a separate auxiliary block.