OTM_C20D Compact ABB Automatic Transfer Switch

The OTM_C20D ABB Automatic Transfer Switch can be used as a source transfer switch in a three-phase or single-phase networks. Monitored conditions are, no- voltage and phase-loss. You can operate the switch, either manually with the handle or automatically by the AUTO mode. The automatic operation modes include Line 1 priority and no line priority.

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Features of ABB Automatic Transfer Switch

  • Reasonable structure, small volume, nice appearance, provided with protective shield, safer and more reliable power supply.
  • Complete protective functions, including short circuit, overload, open phase, and loss-of-voltage protection.
  • Noiseless, energy saving, simple installation, easy operation, reliable and stable performance.

Applications of ABB Automatic Transfer Switch

  • Fire-fighting equipment
  • Smoke Extract Fans
  • Sprinkler pumps
  • Emergency lights

Specification of ABB Automatic Transfer Switch

ABB Automatic transfer switch Parameters
Rated operational voltage U e 220~240VAC(2P) 380~415VAC(3P/ 4P)

50~60 Hz

Operating voltage range 0.8~1.2 U e
Accuracy ±5%
Operating angle 90° ( O-I, I-O, O-II, II-O) 180° ( I-O-II, II-O-I)
OFF time 610 ms ± 10%
Electromagnetic compatibility Class B
Ingress Protection Rating IP20, front panel
Rated impulse withstand voltage U imp 8 kV (6 kV for the control circuit, disconnect the power line of the control circuit before the

dielectric voltage withstand test)

Operating temperature -25~55℃
Transportation and storage


-40~70 ℃
Altitude Max. 2000 m

Dimensions of ABB Automatic Transfer Switch

dimensions of OTM_C20D Compact ABB Automatic Transfer Switch