EMX4 Soft Starter

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.

EMX4 Soft Starter

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

Integration and Management

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


  • Motor thermistor
  • Current imbalance
  • Under/Overcurrent
  • Phase sequence
  • Phase loss
  • Power loss

Communications options

  • Modbus RTU
  • Profibus
  • DeviceNet
  • Modbus TCP
  • ProfiNET
  • Ethernet IP

Smart Card Options

  • Pumping Smart Card

Other Accessories

  • Remote HMI

Start Pumping Smart

Installing the Pumping Smart Card allows applicable sensors to be directly connected to the EMX4. This removes the need for extra components normally required to provide this level of specific information and control for your system.

Banishing Water Hammer

There are multiple causes of water hammer and each pump system has unique characteristics. For these  reasons, ensuring a pump system is  free of water hammer can be a complicated task.

Pumping engineers around the world are relying on AuCom’s unique XLR-8 technology to help tune pump starting and stopping for optimal results. XLR-8 provides a choice of ramp profiles to  deal with the different causes of water  hammer. So whether you are trying to prevent rapid changes in flow rate, flow direction, or water column separation  and closure, XLR-8 puts the right start  and stop profile at your fingertips.

Conveyor Control

An energy audit of a quarry identified a VSD controlled 132 kW conveyor that always operated at full speed. An EMX4 Soft Starter offered this fixed speed application savings of > €1,750 p.a. as well as a reduction in site harmonics.

Correctly identifying this conveyor as a fixed speed application at installation would have substantially reduced the capital costs. Using an EMX4 with a fixed speed application delivers superior acceleration and deceleration performance, advanced motor protection and communications functions.

Spray Irrigation

EMX4 starters fitted with Pumping Smart Cards are providing farmers with improved control of their spray irrigation.

  • Built in timers and scheduling functions enable operation to be tailored to match water restrictions and optimal electrical tariffs.
  • Travel to the pump shed is reduced by the Sleep Mode and Automatic Restart functions. These automatically restart operation after irrigators are shifted or temporary electrical disturbances interrupt irrigation.
  • All this and more without the cost and complexity of separate control logic and wiring.


Current Range 24 A ~ 580 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 ~ 600 VAC (± 10%)
EMX4i-xxxx-V7 380 VAC ~ 690 VAC (± 10%) [earthed star supply system only]
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-C1 (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 4 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.


RCM IEC 60947-4-2
CE IEC 60947-4-2

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