Motor protection MCCB with 330 kA interrupting rating
Its interrupting capacity reaches 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 52.5 kA at 690 V — figures that govern selectivity and SCCR coordination in high-fault panels. ETU350M electronic release with phase-failure detection.
The 330 kA rating at 240 V is the headline figure, but the real-world coordination study uses the 242 kA at 415 V or 440 V — common in North American 480Y/277 V and European 400 V distribution. At 690 V the breaker still clears 52.5 kA, covering industrial drives and mining equipment fed from 690 V grids. The 181 mm height leaves clearance for auxiliary wiring and the undervoltage release module.
Auxiliary contacts and releases
The auxiliary release design is the undervoltage type, factory-fitted as order code 3VA9608-0BB24.