That 40 A holds flat from 40 °C up to 50 °C — only above 55 °C does it begin to derate, dropping to 39 A at 55 °C and 37 A at 70 °C, so in a warm enclosure you still have nearly full rated capacity. The breaking capacity is where this breaker earns its place: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V.
TM210 release and thermal-magnetic trip curve
The overcurrent release is designated TM210, a thermal-magnetic type that provides inverse-time overload protection via a bimetal element and instantaneous short-circuit protection via a solenoid. This is the standard choice for general distribution and feeder circuits where you need coordination downstream without nuisance tripping on motor inrush.
Lifecycle and sourcing — active, no obsolescence concern
This part carries a lifecycle status of current production. There is no end-of-life notice, no last-time-buy window, and no successor part number to track. For the BOM freeze or the MRO planner stocking a spares cabinet, that means the supply channel is stable — no urgency to buy ahead of a phase-out.