Three-phase dv/dt limiting reactor ED3du

Limiting reactors are basic elements for motor protection. Insulation system of the motor is protected against high steepness of PWM voltage pulses generated by a frequency converter. ED3du reactors are the most effective with short to medium length of motor cables. They are the minimum necessary that the user should provide for the purpose of long, failure-free operation of the AC motor.
Benefits Application
  • Reduction of the steepness of voltage rise dv/dt
  • Lower motor temperature
  • Prolonged motor life
  • High control precision with simultaneous motor protection
  • Limiting EMC disturbances caused by transistors switching
  • Drive systems with frequency converters
  • AC motors with lowered insulation strength
  • Motor cables of short to medium length

Typical application schematic

Special execution
Products with parameters exceeding the catalogue card can be made upon prior contact.

Download catalog card in PDF

Product for:


Rated current 6-2250 A
Rated voltage

380-500 V

Rated frequency 50/60 Hz
Switching frequency ≥2kHz
Overload capability 110% In (continuous)
160% In 1 min/h (momentary)
Cooling AN – air natural
Ambient temperature 40°C – land design
45°C – maritime design
≥50°C –  heavy duty design or derating
Insulation class F (155°C)
Winding material Aluminium, copper
Standard equipment NC temperature switch
Mounting Standing, vertical
Degree of protection IP00
Standards compatibility PN-EN 61558-20,
PN-EN 60076-6

*- UL approved insulation system

Obudowa leżąca IP 23 dla urządzeń trójfazowych

for horizontal mounting IP23

Obudowa naścienna IP 23 dla urządzeń trójfazowych

wall mounted IP23

Obudowa stojąca IP 23 dla urządzeń trójfazowych

for vertical mounting IP23

Obudowa stojąca IP 44 dla urządzeń trójfazowych

vertical design IP44

Obudowa stojąca IP 54 dla urządzeń trójfazowych

vertical design IP54

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