Automatic Transfer Switches (ATS)

Automatic Transfer Switches (ATS) equipped with switches that provide increased reliability and reduced maintenance compared to solenoid operated ATS. Integrated overcurrent protection is an option with a switching mechanism in either 3 or 4 poles.

Includes a Woodward/IEM DTSC/XFER-200 controller with a friendly-use interface and different communication options, specially designed for emergency systems, in critical and non-critical loads.


  • Current: 3200A max
  • Voltage: 208/240/480/600VAC
  • Short-circuit withstand: 65/85/100/150kA
  • Shot-time withstand: 65/85kA
  • Breakers/Switches: Siemens WL 3200AF, 3P/4P
  • Access/Entry: Rear top or bottom
  • Open-, delayed-, or closed-transition operation
  • Automatic or non-automatic (manual) control
  • Seamless integration with IEM LV switchboards and switchgear

Advantages of IEM’s ATS:

  1. Fully rated bus is based on density ratings, not UL heat rise tests, resulting in more bus and lower operating temperatures.
  2. All enclosures are designed for specific applications with improved dimensional flexibility and finished using a state-of-the-art powder coating system, providing an indoor finish that exceeds the 1500-hour salt spray testing requirement for outdoor equipment to 3000 hours.

ATS Briggs & Stratton

This device stands guard and senses when utility power flowing to your home is interrupted, then automatically turns on your Briggs & Stratton standby generator.

ATS Terasaki

The most important input of a transfer switch is its switching mechanism, and TERASAKI ELECTRIC manufactures different types of mechanisms that can be used to produce these devices, either manual or automatic:

  • Molded Case Circuit Breakers (MCCB), from 125 to 2000 amperes.
  • Air circuit breakers (ACB), from 800 to 6300 amperes.
  • Contactors, from 9 to 800 amperes.

Depending on the application, different mechanisms can be chosen:

Switch/Molded Case Switch:

  • Link type mechanical locking: used between switches of the same frame (size), motorized or single, with the possibility of combination between 3-pole and 4-pole switches at the same time.
  • Cable type mechanical interlock: used especially when interlocking between breakers of different frame (size) is required.
  • Front mechanical interlock: designed for use in manual mechanisms that do not require automation.

Air break switch:

  • Key interlocking: using less key than the number of switches, reliable and effective interlocking can be achieved.
  • Cable interlocking: system of cables or rods that simultaneously maneuver 2 or 3 switches, horizontally (fixed and withdrawable types) and vertically (withdrawable type only). Can be combined with any size of the ACB range.


  • A two contactor system can be interlocked using a mechanical interlock, whereby both devices are prevented from being operated at the same time, which, together with an electrical interlock using their auxiliary contacts, provides the greatest reliability to the system.