MDB_400/16 – 16Amp AC Inverter Output Choke, 3 Phase

The Block MDB-400 series motor chokes (output reactors) are designed to protect motors and improve performance in inverter-driven systems. Installed between the variable frequency drive (VFD) and the motor, they reduce voltage spikes, limit dv/dt, and minimise stress on motor windings caused by fast-switching power electronics.

By smoothing the PWM output waveform from the drive, MDB-400 motor chokes help reduce electromagnetic interference (EMI), lower motor heating, and extend the service life of both the motor and connected equipment. They are particularly beneficial in installations with long motor cable runs or where sensitive motors are used.

These output chokes also help to reduce bearing currents and acoustic noise, improving overall system reliability and operational stability in demanding industrial environments.

Typical applications include:

• Variable frequency drive (VFD) motor systems
• Installations with long motor cable lengths
• Industrial automation and process control systems
• HVAC and pump motor applications
• Environments requiring reduced motor stress and extended lifespan

Key Benefits

• Reduces dv/dt and voltage spikes at the motor terminals
• Protects motor insulation and extends motor lifespan
• Minimises electromagnetic interference (EMI)
• Reduces motor heating, noise, and bearing currents
• Improves overall system reliability and performance
• Ideal for inverter-driven motor applications