What this MCCB does and where it fits
Its TM240 thermal-magnetic release provides fixed overload and short-circuit protection without the need for an external trip unit. The 50 A continuous rating holds flat from 40 °C through 50 °C, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — so in a hot enclosure you lose 5 A by the time ambient hits 70 °C. Interrupting capacity is 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V; that 220 kA figure at 240 V means it can clear a fault on a high-capacity transformer secondary without upstream fuses, but at 690 V the 17 kA limit is the binding number for a 690 V line — verify your available fault current is below that.
The breaker measures 76.2 mm wide, 130 mm high, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. The TM240 release is fixed, so no field-adjustable trip settings — you select the breaker for the load and leave it. The two auxiliary switches (HQ) provide status feedback for the panel PLC or remote monitoring.