Breaking capacity reaches 187 kA at 240 V AC, 121 kA at 415/440 V, 79 kA at 500 V, and 4.25 kA at 690 V — figures that cover high-fault utility feeds and transformer secondaries. Communication function is built in, supporting remote monitoring and integration with higher-level control systems.
Derating begins at 55 °C (60.6 A), stepping down to 53.6 A at 70 °C. Maximum power loss is 4 W — low enough that ventilation spacing in a standard enclosure is adequate. Front IP40 protection means the breaker face is protected against tools and small wires, but the body is not sealed against washdown.
Verify cutout depth against the 86 mm projection behind the panel face — the ETU850 display and communication module add no extra depth beyond the listed figure.