MCCB for high-fault panel builds
Its interrupting capacity hits 187 kA at 240 V and still holds 121 kA at 415/440 V — enough to clear a high-fault service entrance without cascading upstream. The 86 mm depth and 140 mm width fit standard MCCB mounting footprints; the 181 mm height leaves room for gland plates and busbar risers.
Current ratings and thermal derating
Rated 250 A continuous at 40 °C, the breaker holds that rating through 50 °C. Above that it derates: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C. Maximum power loss is 48 W. For a panel builder, the 250 A frame means this breaker handles a 250 A bus without upsizing, but the thermal curve matters if the panel runs hot — at 60 °C you lose about 7% headroom.
Interrupting performance across voltages
Breaking capacity is rated per IEC 60947-2. At 240 V: 187 kA. At 500 V: 75.6 kA. At 690 V: 4.5 kA. The high 187 kA at 240 V suits North American service-entrance applications with transformer impedances below 1%. The drop at 690 V to 4.5 kA means this breaker is not the right choice for 690 V distribution with high fault current — the 690 V rating is for low-fault sub-distribution only.
Auxiliary switch complement: two auxiliary switches, one trip alarm switch, one electrical alarm switch HQ. Communication function is absent — this is a standalone breaker, not a SENTRON 3VA2 with integrated Profibus/Modbus. The basic switch base is 3VA2225-5HL42-0AA0.