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AT1K series controller is an automatic transfer switch controller with user friendly interface and controls. In auto mode, ATS controller monitors voltage and frequency of incoming AC supply from two different sources namely S1(Mains) and S2 (Genset). In event of S1 failure, it issues a start command to S2 and transfers load on it. When S1 is available again, the controller restores the load back to S1.

In manual mode, the controller allows the operator to manually control the transfer of load using transfer keys available on front facia. Various timers available ensure the precise switching among sources by distinguishing between actual failure and momentary transients.

  • AT1K series controller is provided with immediate phase reversal detection feature which allows user to configure the action
  • It is equipped with a USB port for communication with PC via configuration utility
  • Backlit and full graphics LCD with power saving feature provides prolonged battery life


  • Full graphics back-lit LCD display with power save mode
  • Monitors 1ph/3ph voltage, frequency & load current for mains and generator; monitors 1ph/3ph power factor for generator
  • Offers automatic & manual modes of operation
  • Offers "Auto exercise mode" (2 events) to start and stop the genset for preconfigured time
  • Versatile software capable of saving "events" during operation; event log for 100 events with real time clock (RTC) stamps and engine run hour information
  • Access to each parameter through PC Software or control keys on front fascia of AT1K series controller
  • Immediate phase reversal detection with configurable action
  • Communicates with PC via configuration utility through a USB port
Feature DSE331 DSE335 AT1K series Comments
Configurable Inputs 4 12 9
Configurable Volt free O / P 4 6 0
Configurable DC output 4 6 7
Preconfigured parameter profile support x x 10 Available in the next revision
Flexibility to choose S1 / S2 as mains or generator x Available in the next revision
Three phase voltage monitoring
Three Phase power monitoring x
Switches power when mains ( utility ) supply fails and switches back when mains ( utility ) supply returns
Check sync feature ( closed transition ) x Available in the next revision
Configuration Suite PC Software
Load Inhibit
Start Inhibit
Icon or text LCD display
Phase rotation detection x
RS485 x x Available in the next revision
LED Indications x

Environmental Specifications

  • Operating/Storage temperature: -20°C to 65°C as per IEC 60068-2-1, 2
  • Vibration: 2G in X,Y,Z axis for 8-500 Hz as per IEC 60068-2-6
  • Humidity: 0 to 95% RH as per IEC 60068-2-78
  • EMI/EMC: Compliance as per IEC 61000-6-2, 4
  • Power Supply: 8V - 32V continuous
  • Ingress Protection: IP65 for front face with optional gasket as per IEC 60529
  • Shock: 15 g for 11 mS, compliance as per IEC 60068-2-27

Technical Specifications

  • Power Consumption: ~0.08A @ 12V or 24V DC (Standby mode)
  • Crank-Start Dropout Survival Period: 50 mS for a drop from 12V DC
  • Digital Output: 7 x 0.75A high-side drivers configurable outputs
  • Digital Input: 9 switch-to-ground configurable inputs
  • Mains / Genset Voltage Measurement: 20V-385V AC RMS @ 3-75 Hz for Ph to N
  • Load Current Measurement: 0A - 5A AC RMS for current transformer (CT) secondary
  • Dimensions:
    External dimensions: 139 mm x 114 mm x 37.5 mm
    Mounting panel cut: 118 mm x 93 mm