It is the line-protection version, meaning it is designed to protect cables and distribution buswork from overload and short-circuit faults — not motor or generator protection, which would use a different release curve. The TM240 release provides an adjustable long-time pickup (Ir) up to 1000 A and a fixed magnetic instantaneous trip.
Interrupting capacity — where it clears faults
This MCCB delivers 121 kA interrupting capacity at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Thermal derating — what 100 A means at panel ambient
Above that, derating kicks in: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. Plan the load at 91 A if the enclosure ambient hits 70 °C, not the nameplate 100 A. Maximum power loss is 25 W. That's the heat the breaker dumps into the panel at full rated current — a factor for enclosure thermal calculations, especially in sealed cabinets.
The 4-pole width of roughly 4 inches (101.6 mm) is standard for this frame size.