Its TM120M thermal-magnetic release gives a fixed 125 A rating across the 40 °C to 50 °C ambient range, then derates gradually to 114 A at 70 °C. The interrupting capacity is 220 kA at 240 V, 154 kA at 415 V, and 75.6 kA at 440 V — figures that put it in the high-fault-current class for industrial distribution.
The 125 A continuous rating at 40-50 °C means this MCCB can carry a full 125 A load without derating in a typical ventilated enclosure. Above 55 °C, the thermal curve pulls back — at 70 °C it's good for 114 A. For a motor starter circuit, the TM120M release provides the magnetic short-circuit trip plus thermal overload curve matched to motor protection profiles. The 3-pole configuration handles three-phase loads.
Integration notes — auxiliary switches and basic switch
The auxiliary switches are wired separately from the main power path.