The Siemens SENTRON 3VA2225-5HL42-0CA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with an ETU320 electronic trip unit. It interrupts up to 187 kA at 240 V and 121 kA at 415 V, making it a high-breaking-capacity choice for main or feeder protection in industrial switchboards.
Interrupting capacity and selectivity
At 240 V the breaker clears 187 kA — that's the sort of SCCR you need at the service entrance or on a high-fault transformer secondary. At 415 V it still holds 121 kA, dropping to 79 kA at 500 V and 5.1 kA at 690 V. The 800 V rated insulation voltage (Ui) keeps it comfortable on 690 V systems with margin.
Thermal derating and endurance
Rated 250 A up to 50 °C ambient; above that it derates linearly — 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. That's a 15 % drop from 50 to 70 °C, so if the panel runs hot, size the breaker for the actual ambient. Mechanical endurance is 20 000 operations, which is typical for a fixed-mount MCCB in distribution duty.
Auxiliary releases and trip unit
Factory-fitted with an undervoltage release (UVR) — part number 3VA9608-0BB24 — which trips the breaker when supply voltage drops below a set threshold. No auxiliary contacts, no ground-fault module, no communication function on this variant. The ETU320 overcurrent release is a basic electronic trip unit with fixed time-current curves, suited for line protection (not motor or generator protection).
Dimensions and panel fit
The breaker measures 181 mm high × 140 mm wide × 86 mm deep. That width is standard for a 4-pole 250 A SENTRON frame; it occupies the same footprint as other 3VA2 fixed-breaker variants. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C. Maximum power dissipation is 50.5 W — account for that in the enclosure thermal calculation.