MCCB for line protection with ETU350 trip unit
The interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 17 kA at 690 V — figures that govern the available fault current the breaker can safely clear at the point of installation.
The 250 A rating holds at ambient temperatures up to 50 °C; above that, the breaker derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. Maximum power loss is 40 W.
An undervoltage release (UVR) is integrated — when control voltage drops, the breaker trips, providing a coordinated shutdown on loss of control power. The UVR design is specified as part of the basic switch assembly (3VA2325-5HN32-0AA0), and the integrated auxiliary trip module carries order code 3VA9608-0BB25.