MCCB for motor protection — 160 A frame with ETU350M
It carries a 3-pole design and an ETU350M electronic overcurrent release, which gives you adjustable thermal-magnetic curves plus phase failure detection — that last one is critical on motor loads where a lost phase can burn a winding before the thermal overload catches it. Breaking capacity runs 330 kA at 240 V AC, stepping down to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 52.5 kA at 690 V.
Trip unit and auxiliary contacts
The ETU350M is a microprocessor-based trip unit with LSI curves (long-time, short-time, instantaneous). No undervoltage release or shunt trip is fitted from the factory — those are add-on accessories if your safety circuit requires a remote trip. Maximum power loss is 75 W at rated current — that matters for enclosure thermal calculations if you are packing multiple breakers in a small cabinet.
Front face carries IP40 protection (finger-safe terminals, not hose-down); the breaker is intended for dry indoor panels, not washdown zones. Current derating starts above 55 °C — the breaker carries full 160 A up to 50 °C, then steps down to 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C.