The 4-pole version switches all three phases plus the neutral (neutral left).
For a site electrical engineer, that figure governs selectivity coordination with downstream devices: a 36 kA rated breaker at the panel feeder can clear a bolted fault before a 10 kA rated branch breaker reaches its limit, keeping the rest of the board live. The 25 A rating matches the TM-D trip curve; the magnetic pickup is fixed (not adjustable) on this thermal-magnetic unit.
The 108 mm width, 137 mm height, and 80 mm depth fit standard panel cutouts for ComPacT NSXm frames. Connection pitch is 35 mm with spreaders, 27 mm without — compression lugs or busbars on front terminals (both upside and downside connections are front-accessible). IP40 enclosure protection means it is suited for clean indoor panels; IK07 impact resistance handles accidental tool strikes during commissioning.
Mechanical endurance is 20,000 cycles; electrical endurance varies with load: 20,000 cycles at 440 V at half rated current (In/2), 10,000 cycles at 440 V at full rated current, and 5,000 cycles at 690 V at full rated current. The breaker is certified for isolation per IEC 60947-2 — it provides visible isolation when open (flag indicator for auxiliary contact presence). For a commissioning engineer, that means it can serve as a disconnecting means in the panel without a separate isolator, saving panel space.