The 5SN6450-8CP: This 4-pole breaker occupies 4 modular width units (4 MW) on a standard DIN rail, with an installation depth of 70 mm behind the panel escutcheon. Overall dimensions are 72 mm wide, 90 mm high, and 76 mm deep — the depth includes the front toggle throw, so allow clearance for the handle arc when the panel door is closed. Solid conductor cross-section up to 35 mm² is accepted per pole, which is generous for a 4-pole MCB — enough for sub-feed or tap conductors in a distribution board without needing a reducer.
Voltage and duty ratings
Rated for multi-phase operation at 440 V AC maximum, and single-phase at 440 V AC. DC-side capability tops out at 72 V — this is a line-voltage AC breaker, not a DC string combiner box part. The 50 Hz frequency rating is fixed; it is not a 50/60 Hz dual-rated unit like some SENTRON siblings. Power loss per pole at rated current in hot operating state is 3.7 W, so a 4-pole assembly dissipates roughly 14.8 W internally. In a sealed, low-ventilation enclosure, that heat must be factored into the thermal budget — derating may apply above 40 °C ambient.