Siemens SENTRON 3VA2225-5JQ32-0JA0 — 250 A MCCB for Line Protection
The Siemens 3VA2225-5JQ32-0JA0 is a 3-pole molded case circuit breaker from the SENTRON family, rated 250 A at 40 °C and designed for line protection. Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V, covering high-fault installations. A built-in shunt trip (STL) allows remote tripping, and the breaker supports communication functions for integration into a monitored distribution system.
Breaking Capacity and Thermal Derating — What the Ratings Mean
The 187 kA at 240 V and 121 kA at 415 V tell you this MCCB can safely interrupt very high fault currents without upstream fuses — critical for main feeders in industrial switchboards. At 500 V the capacity drops to 75.6 kA, and at 690 V to 4.5 kA, so verify the available fault current at your system voltage. The continuous current rating is 250 A from 40 °C to 50 °C; above that it derates linearly to 200 A at 70 °C. If your panel ambient runs hot, the 200 A figure at 70 °C is the one to size against.
Lifecycle and Sourcing
This part carries a current lifecycle stage, meaning Siemens continues to manufacture it as an active catalog item. It is sourced and quoted to order through independent distribution; availability and current pricing are confirmed at quote time.
Integration and Mounting
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without special adapters. The shunt trip (STL) auxiliary release enables remote tripping from a safety circuit or PLC output, saving a separate contactor for emergency-stop applications.