What it is and what it does
The Siemens SENTRON 3VA2225-5JP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, designed for line protection in industrial power distribution. Its ETU550 electronic trip unit provides adjustable overcurrent protection with communication capability, making it suitable for selective coordination studies and remote monitoring setups.
Breaking capacity — the real-world fault clearance
This MCCB clears 187 kA at 240 V AC, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. The 187 kA figure at 240 V means it can safely interrupt very high fault currents common on low-voltage secondary substations — a critical spec for main switchboard applications where upstream transformer capacity is large. At 690 V the 4.5 kA rating reflects the reduced arc-quenching capability at higher voltage; verify the available fault current at your service voltage before committing the BOM line.
Thermal derating — what the 250 A rating really means
The 250 A continuous rating holds flat from 40 °C to 50 °C ambient. Above that it derates: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If the breaker lives in a crowded panel with elevated internal temperature, use the 55 °C or 60 °C figure for your load calculation — not the 40 °C nameplate. The 48 W maximum power loss also contributes to enclosure heat rise; factor it into the panel thermal budget.
Mounting and panel fit
Dimensions are 86 mm deep, 140 mm wide, 181 mm high. The 140 mm width across 4 poles means it occupies standard MCCB mounting space in a distribution panel or switchboard. Front IP40 protection suits indoor panel installation where no washdown or dust ingress is expected. The ETU550 electronic trip unit draws its operating power from the line side — no auxiliary supply needed for the trip function, but the communication function (if used) requires a separate bus connection.
Compliance and documentation
As a Siemens SENTRON product, this MCCB carries the usual IEC/EN 60947-2 certification for molded case circuit breakers. RoHS and REACH compliance documentation is available from Siemens directly. The 800 V rated insulation voltage confirms suitability for 690 V systems with margin. No specific UL or CSA listing is stated in the evidence; verify local code acceptance for your jurisdiction.