Motortronics MVC4 series medium voltage soft starters:


The MVC4 Medium Voltage Series Soft Starter is designed to start AC motors in any fixed speed application. It provides maximum protection with “True Thermal Modelling,” while allowing smooth, stepless control of acceleration and deceleration. The MVC4 Series guarantees power control and protection for your most important assets.


MVC-ARC-A&MVC-ARC-B are arc resistant designs


AC Supply Voltage

2300, 3300, 4160, 6000/7200V, 11-15kV

VAC +10% to -15%, 50/60 Hz line voltages


HP Ratings

Up to 10,000HP @ 7.2kV (800 Amps max)

Up to 20,000HP @ 15kV (800 Amps max))

SCR Overload Ratings

500% – 60 seconds, 600% – 30 seconds


Contact us for higher rating requirements




  • Advanced motor protection relay and ramp features programmable via the keypad or a laptop computer.
  • Fiber optically isolated low voltage compartment with up to 110kV BIL rating for safety and reliability.
  • Built-in 120V control power transformer*; voltage and current metering.
  • Load-break / fault-make rated disconnect switch with door safety interlocking.*
  • Visible grounding bar for safe operation.
  • Coordinated motor fuses with blown fuse indicators.
  • Line isolation vacuum contactor.*