MCCB for line protection — 20 A, 121 kA interrupting
Its interrupting capacity hits 121 kA at 240 V, tapering to 75.6 kA at 415 V and 52.5 kA at 440 V — that's the short-circuit current it can safely clear without welding contacts or rupturing the case.
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — that's a compact 3-pole MCCB that fits standard SENTRON mounting bases and busbar systems.
Rated current holds at 20 A from 40 °C through 55 °C, then derates to 19 A at 60–70 °C. That's a generous thermal margin — most MCCBs start derating at 40 °C. Insulation voltage rated 800 V, so it's fine on 480/600 V systems with headroom.