Its 32 A thermal-magnetic TM-D trip unit at 40 °C handles overload and short-circuit protection in a 4-pole (4P) package, with a 50 kA interrupting rating at 415 V AC — that's the N-level performance for this frame, meaning it clears high-fault currents without cascading upstream in a panel.
The 50 kA at 415 V AC is the short-circuit breaking capacity: it safely interrupts a fault up to 50,000 A, which is the N performance tier for the NSXm 63N frame. Category A utilisation (no intentional short-time delay) means it trips instantaneously on short-circuit, so selectivity with downstream breakers relies on current discrimination, not time grading. The IP40 front face keeps tools and fingers out; the IK07 impact rating means it survives a 2 J hammer blow — standard for enclosed switchgear. Mechanical durability is 20,000 cycles, with electrical endurance at 20,000 cycles at 440 V at rated current and 10,000 cycles at 440 V at full rated current — enough for frequent switching in a distribution board but not for a motor-starting duty cycle.
The 9 mm pitch takes 12 modules of width; with spreaders the connection pitch is 35 mm, without spreaders it's 27 mm. Neutral is on the left. The grey RAL 7016 housing is the standard industrial finish.