MVS Soft Starter

Integrated Control & Protection

MVS Soft Starter

AuCom's MVS medium voltage soft starters are an integrated solution for motor control and protection. MVS soft starters feature advanced soft start and soft stop functionality with extensive motor and system protection, plus a user-friendly interface and complete commissioning diagnostics.

MVS soft starters provide integrated motor starting and monitoring functions for the most demanding industrial situations. Advanced algorithms ensure ultra-smooth starting and stopping, and fully adjustable protection features maximise electrical and mechanical protection for your motor and system. A large-format display and detailed performance logs make setup and operation simple.

Model Light Duty Normal Duty Heavy Duty Severe Duty
MVS-0080 96 A 80 A 72 A 59 A
MVS-0159 190 A 159 A 143 A 117 A
MVS-0230 282 A 230 A 201 A 165 A
MVS-0321 393 A 321 A 279 A 229 A

MVS Soft Starter Key Features


Installing and commissioning medium voltage equipment can be an involved and complicated process, and may interrupt your normal operation. To minimise the disruption, the MVS incorporates extensive operating simulations and allows the starter to be tested with a low voltage motor, to confirm circuit integrity and identify any errors before full commissioning. As well as a comprehensive running simulation, the MVS can simulate each protection to ensure the starter is signalling as expected and interacting correctly with associated equipment.


The MVS incorporates extra features to ensure personnel safety when working in the dangerous MV environment. Air insulation assures long-term reliability, and communication between the low voltage controller and the high voltage power assembly is via fibre-optic cables, for complete electrical isolation. Enclosed units designed by AuCom include additional physical isolation and safety interlocks, for maximum safety.

Interface Features

The MVS has a large, real-language display, offering extensive feedback and performance information in an easy-to-read format. The controller can be mounted up to 3 metres away from the unit, reducing the need for separate meters and status indicators.

The MVS stores comprehensive information on the starter's operating history, in separate event and trip logs. Different status screens let you display the information most relevant to your application, or you can configure the programmable monitoring screen to show the information most relevant to your application.


A wide range of protection features ensure your equipment can operate safely in the most demanding environments. Each protection can be individually adjusted to the required sensitivity, or can be disabled if required to ensure vital equipment continues to operate even in the most challenging situations.

Trips and warnings are written to an eight-place trip log, together with information on motor and system status at the time, speeding up analysis of problems.

Installed Worldwide

MVS soft starters have been installed in high-profile locations worldwide. By integrating motor protection with soft start and soft stop control, the MVS provides a simple and cost-effective solution for most major applications.

Safe & Easy Operation

The MVS soft starter includes numerous user-friendly features to ensure safe and easy operation, and has the flexibility to meet the demands of all medium voltage situations.

Enclosure Options

MVS soft starters are available in IP54 enclosures, with options for line and bypass contactors, earthing and isolation switches. AuCom can also design and build enclosures to meet particular specifications, and we offer full applications engineering support at all stages of the design process. For customers who prefer to build their own enclosures, MVS soft starters can be supplied in IP00 format or as a kit for local assembly.

MVS Specification


Mains Voltage

3 x 2300 VAC (± 10%)
3 x 3300 VAC (± 10%)
3 x 4160 VAC (± 10%)
3 x 6600 VAC (± 10%)
3 x 7200 VAC (± 10%)
3 x 11000 VAC (± 10%)
3 x 13800 VAC (± 10%)

Control Voltage

110 VAC to 130 VAC (+ 10% / - 15%)
or 220 VAC to 240 VAC (+ 10% / - 15%)

All models

500 VA, single phase

Mains Frequency

45 Hz to 66 Hz

Rated Power Frequency Withstand Voltage (Ud)

MVSxxxx-V02 ~ MVSxxxx-V04
11450 VAC
MVSxxxx-V06 ~ MVSxxxx-V07
20000 VAC
MVSxxxx-V11 ~ MVSxxxx-V13
35000 VAC

Rated Lightning Impulse Withstand Voltage (BIL) - Overvoltage Category III (Up)

MVSxxxx-V02 ~ MVSxxxx-V07
45 kV
85 kV
95 kV

Form Designation

Bypassed semiconductor motor starter form 1

Control Inputs

Start (Terminals C23, C24)

24 VDC, 8 mA approx

Stop (Terminals C31, C32)

24 VDC, 8 mA approx

Reset (Terminals C41, C42)

24 VDC, 8 mA approx

Input A (Terminals C53, C54)

24 VDC, 8 mA approx

Input B (Terminals C63, C64)

24 VDC, 8 mA approx

Motor Thermistor (Terminals B4, B5)


Relay Outputs

10 A @ 250 VAC/ 360 VA
10 A @ 30 VDC resistive

Main Contactor (Terminals 13, 14)

Normally Open

Bypass Contactor (Terminals 23, 24)

Normally Open

Run Output/ PFC (Terminals 33, 34)

Normally Open

Output Relay A (Terminals 43, 44)

Normally Open

Output Relay B (Terminals 51, 52, 54)


Output Relay C (Terminals 61, 62, 64)


Analog Output (Terminals B10, B11)

0-20 mA or 4-20 mA


Degree of Protection

Power Assembly
IP54/ NEMA 12

Operating Temperature

-10 °C to + 60 °C

Storage Temperature

-25 °C to + 55 °C
-25 °C to + 70 °C (< 24 hours)

Relative Humidity

5% to 95% Relative Humidity

Pollution Degree

Pollution Degree 3


Designed to IEC 60068 Test Fc Sinusoidal
4 Hz to 13.2 Hz: ± 1 mm displacement
13.2 Hz to 200 Hz: ± 0.7 g

EMC Emission

Equipment Class (EMC)

Class A

Conducted Radio Frequency Emission

10 kHz to 150 kHz: < 120 - 69 dB µV
0.15 MHz to 0.5 MHz: < 79 dB µV
0.5 MHz to 30 MHz: < 73 dB µV

Radiated Radio Frequency Emission

0.15 MHz to 30 MHz: < 80-50 dB µV/m
30 MHz to 100 MHz: < 60-54 dB µV/m
100 MHz to 2000 MHz: < 54 dB µV/m

This product has been designed for Class A equipment. Use of the product in domestic environments may cause radio interference, in which case the user may be required to employ additional mitigation methods.

EMC Immunity

Electrostatic Discharge

6 kV contact discharge, 8 kV air discharge

Radio Frequency Electromagnetic Field

80 MHz to 1000 MHz: 10 V/m

Fast Transients

5/50 ns (main and control circuits)
2 kV line to earth, 1 kV line to line

Surges 1.2/50 µs (main and control circuits)

2 kV line to earth, 1 kV line to line

Voltage dip and short time interruption

5000 ms (at 0% nominal voltage)
(safe shutdown)

Short Circuit

Rated short-circuit current, symmetrical, fused (Class E2)

MVSxxxx-V02 ~ MVSxxxx-V07
48 kA
MVSxxxx-V11 ~ MVSxxxx-V13
75 kA

Power Assembly (SCRs bypassed)

20 W approx


10 W approx

Standards Approvals


EMC requirements


UL 508, UL 347


EMC EU Directive


Lloyd's Register

MVS Documentation