It carries a 400 A thermal-magnetic trip unit (TM-D) at 40 °C, with LI protection — L for overload (thermal) and I for short-circuit (magnetic).
Fixed-mount breaker, backplate mounting with a 40 mm connection pitch. Front connections top and bottom, screw terminals. Dimensions: 205 mm high, 120 mm wide, 105 mm deep. IP20 finger-safe protection on the front face. Pollution degree 3 (IEC 60664-1) means it's rated for conductive environments — think unsealed enclosures in industrial or solar fields where dust and condensation are present.
Rated insulation voltage (Ui) of 1250 V AC gives headroom above the 800 V operational rating — the breaker's internal clearances and creepage are designed for that higher stress, so it holds up over time in high-voltage solar arrays. Electrical durability: 4000 cycles at 800 V at full rated current — that's the expected life under load switching. Mechanical durability: 20,000 cycles. Ambient storage range: -35 to 85 °C.
Category A utilization — not intended for selectivity under short-circuit conditions without specific coordination study. The toggle control and thermal memory (which retains heat history after a trip for accurate re-trip timing) are standard.