Its 20 A continuous current (Iu) holds at ambient up to 50 °C without derating; above that the thermal curve drops to 19.2 A at 55 °C and 18 A at 70 °C — relevant if the panel runs hot near the top of a sealed enclosure. The TM240 overcurrent release is a fixed thermal-magnetic type — no adjustable trip curve, so it's a straight swap for a panel that already calls for a 20 A TM240 MCCB. Auxiliary contacts come as 2 HQ switches, which is enough to signal the breaker state back to a PLC or status lamp without an add-on module.
Breaking capacity — what the voltages mean
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA at 240 V is the headline number for North American 240/120 V split-phase or 240 V three-phase panels; the 121 kA at 415 V covers most European 400 V industrial grids.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures.