Redefining soft starters.

Like its predecessor, the EMX4 Soft Starter sets new standards for soft start technology. The EMX4 is not only smaller, more powerful and packed with new control and protection features, it also introduces the game-changing Smart Card capability. Fitting a Smart Card to the EMX4 transforms it from super smart motor controller to complete system controller. This is truly a starter for the future.

Why not make life easier?

Smart does not have to mean complex. While the EMX4 offers more functionality than ever before, it has been designed to make your life easier. By enhancing the display and connectivity functions, and making them intuitive, it is easier to access the right information when you need it, enhancing your overall efficiency.

The EMX4 includes starter, motor and system protection functions, complete with alarms to alert you to any potential issues. In the event that the worst does happen, Power Through and Emergency Run functions give you the power to choose to keep running.

Now you can start smart.

The EMX4 Smart Card redefines the role of a soft starter. With the appropriate Smart Card installed the EMX4 is able to operate as an entire system controller. Smart Cards deliver industry or application specific functionality and are easily inserted into the EMX4, simplifying system design, installation and set-up.

By transforming your EMX4 with an industry specific Smart Card, your system can be  purpose-built around one central point of intelligent control and communications. Utilising this technology will improve overall efficiency of your system, and put you firmly in control.

Efficiency starts with us.

Design of energy efficient systems requires consideration of the system as a whole. Using energy efficient components is important but selection of the correct motor control mode (fixed or variable speed) is also critical. Approximately 80% of motor applications are most efficiently operated at a fixed speed. Using a Variable Speed Drive (VSD) with such a system is hugely inefficient, regardless of the efficiency of the motor you are running.

The use of IE3 motors offers the opportunity to maximise efficiency and save on operating costs. We have developed the EMX4 Soft Starter to be an ideal partner for running IE3 motors.


Motor Control

  • Two motor sets
  • Constant current & current ramp start
  • Adaptive control starting/stopping
  • Kickstart
  • Coast to stop and TVR stop
  • DC brake
  • Soft brake
  • Jog (forward and reverse)
  • Inside delta (6 wire) control
  • Soft trip
  • Pump clean
  • Reversing contactor control


  • Motor thermistor
  • Current imbalance
  • Under/Overcurrent
  • Under/Overvoltage
  • Under/Overpower
    (dry pump protection)
  • Phase sequence
  • Phase loss
  • Power loss
  • Fail safe relay
  • Shunt trip relay

Integration and Management

  • Multi-language graphical display
  • I/O and network expansion options
  • USB port and data logging
  • Voltage measurement
  • Analog output
  • Emergency run
  • SCR fail PowerThrough operation
  • Daily on/off scheduling
  • Run simulation


Communications options

  • Multi-language graphical display
  • I/O and network expansion options
  • USB port and data logging
  • Voltage measurement
  • Analog output
  • Emergency run
  • SCR fail PowerThrough operation
  • Daily on/off scheduling
  • Run simulation

Smart Card Options

  • Pumping Smart Card

Other Accessories

  • Remote HMI


Current Range  24 A ~ 1250 A (nominal)
Motor connection In-line or inside delta
Bypass Integrated internal


Mains Voltage (L1, L2, L3)  
 EMX4i-xxxx-V5 200 VAC ~ 525 VAC (± 10%)
  EMX4i-xxxx-V7 380 VAC ~ 690 VAC (± 10%)
Control Voltage (A1, A2, A3)  
  EMX4i-xxxxB-xx-C1 (A1, A2) 110 VAC ~ 120 VAC (+10%/-15%), 600 mA
  EMX4i-xxxxB-xx-C1 (A2, A3) 220 VAC ~ 240 VAC (+10%/-15%), 600 mA
EMX4i-xxxxB-xx-C2 (A1, A3) 24 VAC/VDC (± 20%), 2.8 A
Mains Frequency 45 Hz to 66 Hz
Rated insulation voltage to earth 600 VAC
Rated impulse withstand voltage 6 kV
Form designation Bypassed or continuous, semiconductor motor starter form 1

Short circuit capability

Coordination with semiconductor fuses Type 2
Coordination with HRC fuses Type 1
 Electromagnetic capability  (compliant with EU Directive 2004/108/EC)
EMC Immunity IEC 60947-4-2
EMC Emissions IEC 60947-4-2 Class B


Input rating  Active 24 VDC, 8 mA approx.
Motor thermistor (B4, B5) Trip >3.6kΩ, reset <1.6kΩ


Relay outputs  10 A @ 250 VAC resistive, 5 A @ 250 VAC, AC15 pf 0.3
 Main contactor (33, 34) Normally open
  Relay output A (41, 42, 43) Changeover
  Relay output B (53, 54) Changeover
Analog output (21, 22)  
 Maximum load 600Ω (12 VDC @ 20 mA)
  Accuracy  ± 5%


Operating temperature -10 °C ~ 60 °C, above 40 °C with derating
Operating altitude 0 - 1000 m, above 1000 m with derating
Storage temperature -25 °C ~ 60 °C
Humidity  5% to 95% Relative Humidity
Pollution degree Pollution Degree 3
Vibration IEC 60068-2-6
  EMX4i-0024B ~ EMX4i-0135B IP20
EMX4i-0184B ~ EMX4i-0580B  IP00

Heat dissipation

During start 4.5 watts per ampere
During run   
 EMX4i-0024B ~ EMX4i-0052B ≤ 35 watts approx.
EMX4i-0064B ~ EMX4i-0135B ≤ 50 watts approx
EMX4i-0184B ~ EMX4i-0250B ≤ 120 watts approx.
EMX4i-0352B ~ EMX4i-0580B ≤ 140 watts approx.


CCC GB 14048.6
CE EN 60947-4-2
C-UL C22.2 No. 60947-4-2
UL 60947-4-2
  Lloyds Lloyds Marine No 1 Specification
 ABS Steel Vessel Rules 2010
RCM IEC 60947-4-2

EMX4 Soft Starter Documentation