MCCB for line protection — 40 A frame, 187 kA interrupting rating
It carries 40 A continuously at 40 °C ambient (derated to 37 A at 70 °C), with a 3-pole configuration and a rated insulation voltage of 800 V. Maximum power loss is 10.8 W.
The interrupting rating drops as system voltage rises: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V.
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. If the panel enclosure runs hot — say, 55 °C internal ambient — the continuous load must be limited to 39 A per pole.
The shunt trip (STL) requires a separate control voltage; wire the trip coil per the wiring diagram on the breaker label. The auxiliary switch block provides two form-C contacts for status feedback and one trip-alarm contact — useful for PLC inputs or remote annunciation.