SENTRON 3VM1450-4EE42-0AA0 — 500 A MCCB with TM220 Release
The TM220 designation means the thermal pickup (Ir) is adjustable up to 500 A, and the magnetic short-circuit pickup (Ii) is fixed at 5000 A — ten times the rated current — providing instantaneous trip on high fault currents without intentional delay. Breaking capacity varies by system voltage: 121 kA at 240 V, 76 kA at both 415 V and 440 V, and 53 kA at 500 V.
Above that, derate linearly: 488 A at 55 °C, 476 A at 60 °C, 464 A at 65 °C, and 452 A at 70 °C. For a panel with multiple breakers ganged in a confined enclosure, use the 60 °C column as the practical design limit unless forced-air ventilation is verified. Dimensions are 184 mm wide, 248 mm high, 110 mm deep — a 4-pole frame that occupies roughly 7.2 inches of DIN-rail width. Maximum power dissipation is 122.7 W at full rated current. Account for this in the enclosure thermal budget — at 500 A continuous, that heat must be removed to stay within the derating curve above.
It is a straight thermal-magnetic breaker for branch-circuit or feeder protection in distribution panels.