It is configured for line protection — meaning the trip curve and accessories are set for feeder or main breaker duty rather than motor branch protection. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. That 187 kA figure at 240 V is the headline — it clears high-fault scenarios on the secondary side of a 480 V–208Y/120 V transformer or a 240 V delta service without upstream fuses needing to coordinate. Thermal derating is published from 40 °C through 70 °C: it holds 100 A up to 50 °C, then drops to 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C.
Trip unit and auxiliary contact configuration
The ETU550 is an electronic trip unit with communication function, meaning it can interface with a higher-level monitoring system for power data and trip event logging. It is not a basic thermal-magnetic — it gives you adjustable long-time, short-time, instantaneous, and ground-fault pickup settings, though ground-fault monitoring is not fitted on this variant. That gives three separate signal paths: two for status (open/closed) and one dedicated to trip indication. No undervoltage release and no voltage trigger are included on this order code.
No washdown rating; keep it inside the enclosure. Latching endurance is 20,000 operations.