For a 4-pole MCCB on a 415 V three-phase system, that rating gives solid selectivity headroom downstream of a transformer or main switchboard. The class M designation places it in the middle of the 3VA1 breaking capacity range, above standard (S) but below the high-performance (H) class. The TM220 thermal-magnetic trip unit provides fixed thermal overload protection adjustable from 14 A to 20 A (Ir) and a fixed magnetic short-circuit pickup at 16 x In (320 A). That 16x multiplier is typical for motor-starting applications where inrush must ride through without nuisance tripping. The nut keeper kit and DC Power OEM designation in the order code suffix indicate this variant is configured for Chinese OEM panel builders supplying DC power systems. The nut keeper kit simplifies busbar or cable lug termination in high-vibration environments like rail or solar inverter cabinets.
Panel Integration
Mounts in a standard IEC frame 160 footprint with 4-pole spacing. The nut keeper kit is pre-installed on the line and load terminals — no loose hardware to drop into a live panel. Accepts Cu/Al busbars or ring-tongue lugs up to the frame's rated cross-section.