Schneider Electric VW3A7703 Braking Resistor

Description

The Schneider Electric VW3A7703 is a high-capacity braking resistor designed to safely dissipate regenerative energy in demanding motor control applications. It is an essential accessory for Altivar variable frequency drives (VFDs), preventing overvoltage faults on the DC bus during motor deceleration. This ensures smooth, controlled stopping and protects the drive from damage.

Specifications

• Manufacturer: Schneider Electric
• Model: VW3A7703
• Product Type: Braking Resistor
• Power Rating: 200 W
• Resistance Value: 28 Ohm
• Maximum Voltage: 600V
• Series Compatibility: Altivar (e.g., ATV31, ATV312, ATV32)

Label Info

• Brand: Telemecanique (a brand of Schneider Electric)
• Part Number: VW3 A7 703
• Code: 02 31226 2 8028
• Date Code: 1539 (Week 39, 2015)

Application

This resistor is ideal for applications involving high inertia loads, frequent start/stop cycles, or rapid deceleration, such as conveyors, elevators, cranes, and machine tools. It is used in conjunction with a VFD to manage the energy returned by the motor during braking.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this refurbished component, you help avoid approximately 18 kg of CO2 emissions associated with the production of a new one. This is a significant contribution to a more sustainable industrial environment.

Availability

This is an obsolete item but is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

No, the VW3A7703 is specifically designed as an accessory for certain older Altivar drive series, such as the ATV31, ATV312, and ATV32. It is crucial to consult the drive's technical manual to verify compatibility and ensure the resistor's power and resistance values are appropriate for your specific motor and application load profile.

It is strongly recommended to mount this resistor outside the control cabinet or in a well-ventilated enclosure. During operation, braking resistors can generate a significant amount of heat (up to its 200W rating). Inadequate ventilation can lead to overheating, which can damage the resistor and other nearby components and pose a fire risk.

The PA/+ and PB terminals are the connection points for the braking resistor on the corresponding Altivar drive. The drive's internal braking chopper circuit switches this resistor across the DC bus to dissipate regenerative energy. Always ensure correct and secure wiring to these terminals as specified in the drive's installation manual.

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Last Update: Friday, March 13, 2026