It carries a continuous current rating of 20 A across the 40 °C to 55 °C band, derating to 19 A at 60 °C through 70 °C. Breaking capacity is 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — figures that define the available fault current the breaker can safely interrupt at each voltage level. Panel builders sizing for high-fault installations will use the 415 V or 480 V column for typical industrial distribution. Front face IP40. Insulation voltage rated 800 V. Maximum power loss 12 W.
Deployment Context
As a panel-mount MCCB, it integrates into switchboards and distribution panels via screw-clamp terminals. The 101.6 mm width (4 in) and 70 mm depth (2.76 in) determine the DIN-rail or mounting-plate footprint — critical when retrofitting into an existing panel layout or sizing a new enclosure. The TM220 release is a fixed thermal-magnetic trip, not electronic, so no auxiliary power or communication module is required for basic overcurrent protection.