Its interrupting capacity hits 76 kA at 240 V AC and still holds 53 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V — numbers that tell you it can clear high-fault bolted faults without cascading upstream, which is the deciding factor for panel SCCR compliance (IEC 60947-2).
The breaker holds its full 40 A rating from 40 °C up to 50 °C, then drops to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. That derating curve is what you need when the panel runs hot — if your enclosure ambient sits at 60 °C, you're limited to 39 A continuous, not the nameplate 40 A. The TM210 thermal-magnetic release (adjustable Ir up to 40 A) lets you fine-tune the trip point to the actual load without swapping the breaker.
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that fits most DIN-rail or screw-mount panel layouts.
Electrical ratings and approvals context
Rated insulation voltage Ui is 690 V, and max operational voltage for DC applications is 500 V — so it can serve DC bus or battery circuits within that limit. The 12 000-cycle mechanical endurance is typical for a panel-mounted MCCB; it's not a switching contactor, but it will handle routine isolation without issue.