The Siemens SENTRON 3VA2225-5JQ42-0DJ0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a minimum trip setting of 1.5 A. It's built for line protection in distribution panels and motor control centers, and it carries a 187 kA interrupting capacity at 240 V — that's the number that governs fault-energy coordination downstream. The 121 kA at 415 V and 75.6 kA at 500 V still cover most industrial service-entrance and feeder applications. At 690 V the rating drops to 4.5 kA, so it's not a 690 V main breaker; keep it on the 400 V class bus.
Thermal derating and auxiliary configuration
The breaker holds 250 A flat from 40 °C up to 50 °C, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If your panel ambient runs above 50 °C, size the load accordingly. It ships with 2 auxiliary switches plus 1 trip alarm switch (HP type), and an undervoltage release is integrated — that UVR is wired into the control circuit, not the power path, so a loss of control voltage trips the breaker open. The basic switch module is order code 3VA2225-5JQ42-0AA0 if you need a replacement core.
Panel fit and dimensions
The breaker measures 181 mm high, 140 mm wide, and 86 mm deep. That's a standard 4-pole MCCB footprint for a 250 A frame — it drops into a SENTRON panelboard or a DIN-rail adapter plate without re-drilling. The 86 mm depth leaves room for rear-connected busbars or cable lugs in a 200 mm deep enclosure.