Features & Benefits

MVC4 Medium Voltage Soft Starter


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.*

Fully rated bypass contactor for increased thermal capacity and optional across-the-line starting.

Heavy duty SCR stack assemblies with ring transformer isolation for reliable SCR gate firing.

RTD Option accepts up to 12 RTD inputs.

Zero sequence ground fault protection option.

Top entry, bottom exit with room for stress cones.

Removable entry plates for easy connections.

NEMA 12 gasketed enclosure (NEMA 3R optional).

Advanced Protection

True Thermal Modeling monitors the motor for excessive thermal conditions due to starting, running and even ambient conditions.

Retentive Thermal Memory for continuous overload protection even after a complete power loss.

MVC Plus remembers the last thermal condition of the motor, observes the off time via a real-time clock and adjusts the thermal model accordingly.

Non-Volatile Memory stores the thermal memory without the need for batteries.

True Time Thermal Tracking adjusts the thermal model for different cooling rates based on motor temperature,running state or power loss.

Dynamic Reset Response Reset is only allowed after the motor has sufficient thermal capacity for a successful restart.

Thermal Model Biasing adjusts for heating effects of phase current imbalance or optional RTD inputs.

Flexible Setup Choose the level of overload protection.

Programmable Trip Classes selectable from NEMA/UL Classes 5 - 30.

Dual Mode Protection separate trip curves for start and run modes (example: Class 20 for start, Class 10 for run).

Warning Levels can be programmed and assigned to one of six built-in output relays.

Custom Trip Curve programmable based on the motor manufacturer’s data

Remote or Automatic Overload Reset can be activated for unattended operations.

Where to Buy

Sales Managers


Peter Boyle


Giacomo Raggi


Gemma Gaunt

Europe, Middle East, Africa & India

Motortronics UK Ltd
Bristow House, Gillard Way, Lee Mill Industrial Estate, Ivybridge, PL21 9GG, UK

T : +44 (0) 1752 894554
E : [email protected]

Asia & Australasia

Motortronics International Korea
#601, 632, Seobusaet-gil, Geumcheon-gu, Seoul

T : +82 (0) 2 867 5808
E : [email protected]

Motortronics International Korea
41, Cheoyongsaneop 4-gil, Cheongnyang-eup, Ulju-gun, Ulsan

T : +82 (0) 52 237 5805
E : [email protected]

The Americas

Motortronics Inc
1600 Sunshine Drive, Clearwater
FL, 33765

T : +1 727 573 1819
E : [email protected]


M & P Machinery & Electronics Control
32 Jiaxin Road, Jimo,, Qingdao, 266229

T : +86 53281 725028
E : [email protected]

Beijing Locensate Energy Saving Technology Co. Ltd (LV - Sales)
411 Guangyi Building B 5#, Guangyi Road, Beijing, 100053

T : +86 10 83 131799
E : [email protected]