It mounts on DIN rail and is rated for 277 VAC with a 6 kA interrupting capacity, or 125 VDC with 10 kA interrupting capacity.
Curve D trips between 10× and 20× rated current, so a 2 A breaker holds through a 20–40 A surge for a few cycles. The 6 kA interrupting rating at 277 VAC covers most commercial panel fault-current levels; the 10 kA DC rating handles battery-backed or rectifier-fed circuits. Both poles switch together, so it's a single-pole-switched pair — not a two-pole common-trip for 240 V split-phase, but fine for 277 V line-to-neutral or 125 VDC.
No rewiring or panel rework needed if you're swapping out an older S200 series or a competitor's 2-pole MCB on 35 mm DIN.
Strip length 8 mm. Pitch matches standard 35 mm DIN-rail terminal blocks; the toggle handle clears adjacent breakers in a multi-row panel.