Product information page

Digital Soft Starter is a Full Featured, Microprocessor-Based, for explosion proof Motors 8-1100A, 220-600V

This digital soft starter with a built in bypass is an evolution of our fourth generation of digital soft starters.The RVS-EX incorporates enhanced start-stop characteristics providing the best solutions for most of the applications. The comprehensive motor protection package guarantees long term reliability while the bypass design ensures excellent performance.

Advanced Starting and Stopping Characteristics

  • Reduced inrush current & mechanical shock
  • Soft, smooth, stepless acceleration and deceleration
  • Current Limit
  • Pump Control Program
  • Torque and Current Control Characteristics
  • Pulse Start, Dual Adjustment, Slow Speed with Electronic Reversing

Sophisticated Motor Protection from a Digital Soft Starter

  • Too many starts & start inhibit
  • Long start time (Stall protection)
  • Electronic shear-pin (Jam) with adjustable curves and delay
  • Electronic overload with selectable curves
  • Under current
  • Phase loss
  • Phase sequence and Under/Over frequency
  • Under/Over and No voltage
  • Load loss (motor not connected)
  • External fault
  • Shorted SCR
  • Starter over temperature protection
  • Motor insulation test option)
  • Motor thermistor (option)
  • Built-in Bypass while all protective functions remain active


  • LCD - Two lines of 16 characters each
  • Multilingual - English, German, French & Spanish
  • Four LEDs - On, Run, Ramp Up/Down & Fault
  • Statistical Data - Start, Stop & Fault parameters
  • Full script parameter settings


  • Opto-Isolated Inputs & outputs, two output relays.
  • Local and remote reset.
  • Optional Communication RS 485 with MODBUS RTU or MODBUS Plus protocols
  • Easily operated via keypad, allowing precise settings, LED and interactive LCD (4 languages), Statistical data.
  • Hardware and software allows starting from diesel-generator


  • Normal duty rated design (ambient 40oC)
  • Compact, light weight, aluminum, small foot-print and book type design

Typical Applications for the RVS-EX

  • Pumps (Water utilities, Industry)
  • Compressors
  • Conveyors & monorails
  • Mixers & Agitators
  • Fans & Centrifuges
  • Hydraulic pumps
  • Starting from weak Mains supply

Unique Features of the RVS-EX

  • Maximum Starting Time: 15 seconds
  • Under voltage: 90%
  • Under voltage delay: 4 Seconds
  • Over voltage: 107%
  • Over voltage delay: 1 Second
  • Overload protection: 110%
  • Starting current: 400%
  • Staring voltage: 40% - 50%

The RVS-EX is the only Soft Starter certifide for Ex-E, Ex-N, Ex-D, Ex-P Explosion Proof motor