The Siemens 3VA1225-5GF42-0DA0 is a 4-pole molded-case circuit breaker from the 3VA1 IEC frame 250 series, rated for 250 A continuous current with a TM240 thermal-magnetic trip unit. Its breaking capacity hits 55 kA at 415 V AC (class M), which means it can safely interrupt a fault current of that magnitude without upstream devices needing to clear it — a key figure for panel selectivity coordination in industrial distribution.
Ratings and what they mean for the panel
The TM240 trip offers adjustable overload protection (Ir) from 175 A to 250 A, so you set the continuous current limit to match the downstream load — a motor feeder or a transformer primary, for instance. Short-circuit pickup (Ii) is adjustable between 5× and 10× In (1250–2500 A), giving you room to ride through motor inrush without nuisance tripping while still clearing hard faults fast. The 100% N-conductor protection means the neutral pole is fully rated, not reduced — critical for 4-wire systems with harmonic content where the neutral carries sustained current. The built-in undervoltage release (UVR) operates on 208–230 V AC, 50/60 Hz. It drops the breaker open when supply voltage falls below the dropout threshold, preventing automatic reclosure on a brownout or phase loss — standard practice for motor loads that must not restart unattended.
Lifecycle and sourcing posture
For BOM-line commitment, the key ratings — 55 kA @ 415 V, 250 A frame, TM240 trip with adjustable Ir and Ii, and the 208–230 V UVR — are all confirmed on the order code. Availability and current pricing are confirmed at quote time against an RFQ through independent distribution.