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ATC Molded Case Circuit Breaker & Molded Case Switch Automatic Transfer Switch

ATC Molded Case Circuit Breaker & Molded Case Switch Automatic Transfer Switch

Cat® transfer switches are designed for a variety of standby power applications. They provide flexibility, reliability and value in a compact package. The open transition breaker-based Automatic Transfer Switch (ATS) will provide fully functioning transfer in applications where a momentary loss of power is acceptable on retransfer from emergency to normal power supply. The Cat Open Transition MCCB & MCS types of ATS also permits periodic testing of the emergency source without interrupting power to the loads and are available from 30 to 1000 amperes.

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Rating Range30-1000A

Transfer TypeOpen transition

Switch TypeMolded Case

Control Power30-1000A 2, 3, or 4 Pole, 100% Rated

System Voltage Application120 - 600 Vac, 50/60 Hz

Withstand100,000 amps withstand/closing/ interrupting at480 Vac

Applicable TestingCSA C22.2 No. 178 certified
IBC 2006, CBC 2007 and OSHPD


All controls relays and industrial grade relays are totally encapsulated to minimize exposure to dust and dirt. Lugs are 90º rated and all control wire is #16 AWG, type XLPE with a 125º temperature rating.


Durable powder-coated steel NEMA 1, NEMA 3R and NEMA 12 are available with ATC-100 and ATC-300+ controllers. NEMA 4 is only available with the ATC-800 controller. The enclosures are Seismic Qualified (BOCA, CBC, IBC, UBC). The hinges have removable hinge pins to facilitate door removal for easy wall mounting or service and are supplied with pad-lockable latches.


Suitable for service entrance

Load sequencing contacts

Selectable automatic or non-automatic operation

Controller availability: ATC-100, ATC-300+,and ATC-800

Field selectable, multi ratio, control voltage transformer 50/60 Hz

Surge suppression

Multi-meter options available

Integral overcurrent protection

Space heaters

Remote communications

Communications for the ATC-300+ Controller via RS-232 or Modbus through an integrated RS-485 port

2- or 4-position test switch


Pre-transfer signal with 1 N.O. and 1 N.C. contacts

Time delay neutral



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