It carries a TM240 thermal-magnetic overcurrent release, rated 125 A continuously at 40 °C ambient, with no derating needed up to 50 °C — the same 125 A holds at 45 °C and 50 °C, then steps down to 122 A at 55 °C and 114 A at 70 °C. That thermal curve means it can serve a full 125 A load in a well-ventilated enclosure without oversizing the frame. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — sufficient for high-fault utility feeds or transformer secondaries in most industrial installations.
These dimensions match the standard SENTRON 3VA molded case footprint — it drops into the same panel cutout and bus-bar spacing as other 3VA1 frame breakers. Maximum power dissipation is 28.1 W at rated load — a figure to include in thermal calculations for sealed or high-density enclosures.