MR3_400/61 – 61Amp AC Inverter Output Choke, 3 Phase

The Block MR3-400 series motor chokes (output reactors) are designed to provide reliable motor protection and performance improvement in inverter-driven systems. Installed between the variable frequency drive (VFD) and the motor, they help 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, MR3-400 motor chokes assist in reducing electromagnetic interference (EMI), lowering motor heating, and supporting stable operation of both the motor and connected equipment. Their compact design makes them particularly well suited to installations where panel space is limited and a cost-effective solution is required.

These output chokes also contribute to reduced bearing currents and acoustic noise, helping maintain dependable system performance across a wide range of standard industrial applications.

Typical applications include:

• Variable frequency drive (VFD) motor systems
• General industrial automation and machinery
• Space-constrained control panels
• HVAC and pump motor applications
• Standard duty environments requiring reliable motor protection

Key Benefits

• Reduces dv/dt and voltage spikes at the motor terminals
• Protects motor insulation and supports longer service life
• Helps minimise electromagnetic interference (EMI)
• Reduces motor heating, noise, and bearing currents
• Compact design optimises panel space
• Cost-effective solution for standard inverter applications