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ATC Contactor Based Bypass Isolation Automatic Transfer Switch

ATC Contactor Based Bypass Isolation 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. A Bypass Isolation Automatic Transfer Switch (ATS) provides fully functioning transfer in applications where emergency power to critical loads must be maintained at all times with no interruption. This type of design allows for inspection, maintenance or replacement of the power switching mechanisms with no interruption in electrical service. Contactor -based Bypass Isolation ATS are available from 100A to 1200A.

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Rating Range100 to 3000A

Transfer TypeBypass Isolation

Switch TypeContactor Based

Control Power100-1200A 2-, 3-, 4-pole

System Voltage Application120 - 600 Vac, 50/60 Hz

WithstandUp to 65 kAIC withstand

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, 3R or 12 enclosures with three door hinges to ensure proper support of the door and door mounted devices. The hinges have removable hinge pins to facilitate door removal for easy wall mounting or service and are supplied with pad-lockable latches.


Space heaters

2- or 4-position test switch

Multi-meter options available

Open, closed or delayed transition

Drawout capabilities on both ATS bypass portions and power switching devices completely interchangeable between ATS and bypass units

Load sequencing contacts

Dual drawout type is field configurable for top or bottom conduit entry

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

Seismic Zone 4 Qualified (BOCA, CBC, IBC, UBC and OSHPD)

Remote communications

Surge suppression

Selectable automatic or non-automatic operation


Time delay neutral

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



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