Siemens SENTRON 3VA2225-6JQ32-0DC0 — 250 A MCCB for Line Protection
The Siemens SENTRON 3VA2225-6JQ32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated 250 A continuous, designed for line protection in distribution panels. Its interrupting capacity reaches 242 kA at 240 V AC and 187 kA at 415 V, so it handles high-fault-current service entrances and main feeders without cascading upstream. The breaker carries a full thermal derating curve: it holds 250 A up to 50 °C ambient, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That means a panel running at 55 °C loses 12 A of headroom — plan the load schedule accordingly. This unit includes an undervoltage release (UVR) and two auxiliary switches (HQ configuration), so it can signal trip status to a PLC or drop the main contactor on a brownout. The basic switch variant is 3VA2225-6JQ32-0AA0.
Interrupting Capacity by Voltage — SCCR Planning
The 3VA2225-6JQ32-0DC0 delivers 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. The steep drop at 690 V means it is not suited for 690 V main feeders unless the available fault current is under 4.5 kA — a rare condition. For 480 V panels the 121 kA figure covers most utility transformer sizes.
Panel Fit and Integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that mounts on a DIN rail or panel-mount adapter. The 86 mm depth leaves clearance for rear-connected busbars in a typical distribution cabinet.