The VW3AP0551 is an enclosure heater accessory for Schneider Altivar Process ATV600 and ATV900 compact drive systems in the 110-315kW power range. It ships as a complete assembly: one enclosure heating element, one thermostat, and one 6 A circuit-breaker.
Sourcing constraint — cannot order standalone
This part carries a specific condition of use: it cannot be ordered alone. It is only available in combination with a standard enclosure for the drive system. If you are sourcing for a panel build or a replacement, the enclosure order must include this heater — it is not a separate line item you can add later without the base enclosure part number.
What it does in the drive system
The heater prevents condensation inside the drive enclosure when the drive is powered down or in a humid environment. The thermostat cycles the heating element to maintain internal temperature above the dew point. The 6 A circuit-breaker provides local overcurrent protection for the heating circuit. For a 110-315kW drive cabinet, this is a standard fit — without it, moisture can accumulate on power terminals and control boards, leading to tracking failures or corrosion over time.