It is configured as a line protection device — the standard role for an incoming feeder or main distribution breaker in a low-voltage switchboard.
Breaking capacity and selectivity headroom
This breaker delivers 187 kA interrupting capacity at 240 V, 121 kA at 415 V, and 53 kA at 690 V.
ETU320 release and adjustable settings
The ETU320 electronic trip unit gives adjustable long-time pickup (Ir) from 320 A to 800 A and instantaneous pickup (Ii) from 1,200 A to 8,000 A. Long-time delay (tr) is settable between 0.5 s and 17 s. That range lets you dial in the protection curve to match cable thermal limits or coordinate with downstream MCCBs without swapping the trip unit. The 800 A frame is fully rated at continuous current up to 65 °C ambient; above that, derate to 767 A at 65 °C and 703 A at 70 °C.
Dimensions are 320 mm high × 210 mm wide × 120 mm deep. Front protection is IP40, so it is suited for indoor panel mounting where tools are the only expected contact.