The VW3A58733 is an enclosed braking resistor for Schneider Altivar 11 variable-speed drives, rated at 68 Ohm with 32 W average power dissipation. The IP30 enclosure keeps the resistor body protected from accidental contact and falling debris inside a panel, but it is not sealed against washdown — mount it in a clean, dry cabinet or a ventilated enclosure bay.
Sizing and thermal management
The 32 W average power rating governs continuous braking duty on small inertial loads — a conveyor stop or spindle deceleration that cycles infrequently. For higher inertia or frequent stop-start profiles, the resistor will exceed its thermal capacity; the drive's braking transistor duty cycle or an external temperature control switch (the protection type listed) must interrupt the circuit before the resistor overheats. The 68 Ohm value matches the DC bus voltage of the Altivar 11 drive family, so the braking torque curve is correct for the drive's internal chopper.
The enclosure measures 2.4 in deep by 3.3 in wide by 13.07 in tall (61 x 85 x 332 mm). That is a tall, narrow profile — it fits into a vertical slot on a sub-panel or inside a wall-mounted enclosure, but the 332 mm height means a standard 400 mm deep cabinet is needed to leave clearance for wiring and airflow above the resistor. The IP30 rating means no gaskets; mount it away from any panel openings that could admit conductive dust or dripping water.