• Standards.
  

  Automatic. Camsco. Transfer. Switch. Produced in IEC 60947-6-1 standards. Low-voltage switchgear and controlgear Part 6: Multiple function equipment. Section 1: Automatic transfer switching equipment.

  Contactor. Transfer. System. Produced in IEC 60947-4-1 standards. Low-voltage switchgear and controlgear Part 4-1: Contactors and motor-starters electromechanical contactors and motor-starters.

  
  

  Structural. Features.

  It has a compact and integrated body structure / Consists of two contactors.

  It has CO auxiliary contact for positions I and II / Each contactor has either an open or closed contact. External auxiliary contacts can be attached.

  It has mechanical interlocking within itself / Mechanical lock must be placed between two contactors.

  It has electrical interlocking within itself.

  
  

  Operation. Mode.

  The switch has the feature of working both manually and automatically.

  When set to the ‘manuel’ position, the switch only accepts intervention with the winding handle on it, and does not respond to any signal or command from outside.

  When set to the ‘automatic’ position, the switch provides transition based on signals from the mains or generator. Even if the mains and generator are active at the same time, the switch always switches to the mains position.

  
  

  Connection. And. Contact. Details.

  or coil connections; Group A (mains); contains AR – Phase, AN – Neutral connection. Group B (generator); contains BR – Phase, BN – Neutral connection.

  For both sides auxiliary contact, ‘C’ is used as common terminal, ‘ON’ as open contact, ‘OFF’ as closed contact.

  Power contacts are silver and tungsten plated over copper. Since silver is a soft material, its micron degree is coated with tungsten to ensure hardening.

  The switch has 50kA and 100kA short circuit capacity. In case of a possible arc, the arc formed at the contacts is thrown out of the switch with the arc extinguishing cells it has.

Comparison Table of Automatic Transfer Switches and Contactors

Electrical interlocking is done through auxiliary contacts. It has priority source selection within itself. Even if the mains and generator are active at the same time, the switch always sets itself to the mains position. An extra control circuit with relays must be made for priority source selection. Its contacts do not stick and never conflict. There is a possibility of its contacts sticking and conflicting. It is controlled both manually and automatically. It is only controlled automatically. It is self-bridged, no bridging busbar is required. It is not self-bridged, it requires a bridging busbar. It has LEDs showing the energized coil. It does not have LEDs showing the energized coil. Position can be observed both with a mechanical position indicator and a latch. Position can only be understood from the slots showing the coil pulling. It has arc extinguishing cells. It does not have arc extinguishing cells. Short circuit breaking capacities are 50kA at 63A, and 100kA at 125A and 250A. Short circuit breaking capacities are 50kA.