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ARD3 motor protection switch

The Acrel ARD3 intelligent motor protection switches can protect motors from numerous faults during operation and display the operating status clearly and intuitively via the LCD. The protection switch features an RS485 remote communication interface and a DC 4-20mA analog output, making it easy to form a network system with control devices such as PLCs and PCs.

  • U, I, P, S, PF, F, EP, leakage, PTC/NTC
  • 16 protective functions
  • Start control
  • 9 programmable DIs
  • 5 programmable DO
  • Modbus RTU or Profibus DP communication
  • 1 DC4-20mA analog output
  • 20 fault records
  • Anti-shaking function

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Product info

Accuracy:U, I: Class 1.5
Frequency range:45–65 Hz
Auxiliary power supply:AC85V–265V/DC100V–350V
SOE Event Recorder:Recording of eight fault messages
Dimensions (L x W x H):81.5 mm x 86 mm x 90 mm
Installation:Main body: DIN 35 mm
Display unit: panel mounting

Technical data

Technical parameters  index
Protector auxiliary power supply AC85-265V/DC100-350V, power consumption 15VA
Rated operating voltage of the motor AC380V / 660V, 50Hz / 60Hz
Rated operating current of the motor 1 (0.1A-5000A) Small special current transformers
5 (0.1A-5000A)
25 (6.3A-25A)
100 (25A-100A)
250 (63A-250A) Special current transformers
800 (250A-800A)
Contact capacity of the relay output Impedance load AC250V, 10A
Relay output contactor 5 channels, AC 250 V 6 A
Nominal capacity negative
Switching input 9 channels, optocoupler isolation
communication RS485 Modbus_RTU, Profibus_DP
Environment working temperature -10ºC～55ºC
Storage temperature -25ºC～70ºC
Relative humidity ≤95﹪No condensation, no corrosive gas
Height ≤2000m
degree of contamination Class 2
Degree of protection Main body IP20, split display module IP54 (installed on the cabinet panel)
Plant category Stage III

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