The VW3A7801 is a braking resistor from the Schneider Altivar 71 drive family, rated 100 Ohm with an average power dissipation of 1.6 kW at 50 °C. It provides thermal protection via an integrated thermal overload relay, so the drive can monitor resistor temperature and shut down before the element fails — a practical safeguard for repetitive deceleration cycles on conveyors, hoists, or centrifuges where the DC bus would otherwise overvoltage.
Dimensions are 452 mm wide x 203.5 mm high x 202 mm deep. The M6 bar wire connection means it terminates directly to the drive's DC bus terminals with ring lugs — no crimp ferrules or spring-cage adapters. IP20 rating in any mounting orientation except horizontal, where it achieves IP23; that matters if the resistor is mounted flat under a panel lid where dripping condensation could enter. Ambient operating range is 0 to 50 °C; storage from -25 to 75 °C.