The Schneider Electric VW3A58734 is a dynamic brake resistor from the Altivar 58 accessory range, designed specifically for the U54N4 and U72N4 drive frames. Its job is to dissipate regenerative energy from decelerating motor loads — essential for vertical conveyors, centrifuges, or any application where the load overhauls the motor and the DC bus would otherwise trip on overvoltage.
Key Ratings & Fit
Rated operational voltage is 110 V AC at 0.3 A and 24 V DC at 0.01 A. That dual-voltage rating means the resistor's control circuit can be driven from either an AC or DC supply, but the power dissipation path is through the resistor element itself — the 0.3 A AC figure is the control signal, not the braking current. The physical envelope is 2.6 in (65 mm) deep, 3.3 in (85 mm) wide, and 13.07 in (332 mm) tall, which fits the mounting provisions inside the U54N4 and U72N4 drive enclosures.