The Schneider Electric DOMF01220 is a Domae-series miniature circuit breaker (MCB) rated 20 A with a C curve, designed for AC branch-circuit protection per IEC 60898-1. Its 2-pole (2P) construction with neutral on the left handles single-phase or split-phase loads up to 230 V AC at 50/60 Hz. The C curve means the magnetic trip fires at 5 to 10 times the rated current (100–200 A instantaneously), which suits moderate inrush loads like small motors, transformers, or lighting banks — not pure resistive heaters (B curve) and not heavy motor starts (D curve). Breaking capacity is Icn 6000 A per IEC 60898-1, adequate for most residential and light commercial distribution boards where the prospective fault current stays under 6 kA. Overvoltage category III means it's rated for fixed-installation downstream of the utility meter.
Clip-on mounting to a 35 mm DIN rail, 36 mm wide (2 x 18 mm modular pitches). Depth is 71.5 mm, height 81 mm — standard Domae footprint that fits most consumer units and sub-distribution boards without crowding the gland plate. Tunnel terminals accept 1–25 mm² rigid or 1–16 mm² flexible copper; strip 14 mm and torque to 2 N·m. The 18 mm phase-to-phase pitch aligns with standard comb busbars, and the manufacturer confirms comb busbar compatibility.