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ATC Contactor-Based Automatic Transfer Switch

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Overview

Cat® transfer switches are designed for a variety of standby power applications. They provide flexibility, reliability and value in a compact package. The open and delayed transition contactor-based Automatic Transfer Switch (ATS) provides fully functioning transfer in Applications where a momentary loss of power is acceptable during transfer and retransfers between normal and emergency power supply.

The closed transition contactor-based ATS is designed to Meet application requirements where emergency back up power is required with no momentary loss of power by connecting both sources before the transfer occurs. Closed transition also permits periodic testing of the emergency power source without interrupting power to the loads.

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Product Features

ATC-100, ATC-300+ or ATC-800 microprocessor-based controller
Voltage and frequency sensing
High withstand and closing ratings
Multiple field programmable set points
Status Display including switch position indication
Source availability indication

Technical Summary

Rating Range: 40-1600A
Transfer Type: Open / Closed Transition
Switch Type: Contactor Based
Rating Range: 40-3000A
Transfer Type: Open / Closed Transition
Switch Type: Contactor Based

Ratings

Control Power: Wall Mount 40-600A 2 or 3 Pole
Floor Standing 600A 4 Pole & 800-1200A 2, 3, or 4 Pole
Two-Position Contactors: Two-position contactors 40-400A
Three-Position Contactors: Three-position contactors 40-1200A
System Voltage Application: Up to 600 Vac, 50/60 Hz
Applicable Testing: UL 1008 listed, CSA C22.2 No. 178 certified, IBC 2006, CBC 2007 and OSHPD

Standard/Optional Features

Standard Equipment:

Contact Composition
- Caterpillar utilizes silver composition contacts designed to meet the stringent requirements of UL 1008. All contactors are designed so that the contacts can be visually inspected without major disassembly and are protected by arcing contacts.
Controls And Wiring
- 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.
Enclosure
- 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.

Optional Equipment:

Available Options
- 2- or 4-position test switch
- Controller availability: ATC-100, ATC-300+,and ATC-800
- Delayed transition or closed transition
- Multi-meter options available
- Surge suppression
- Space heaters
- Field selectable, multi ratio, control voltage transformer 50/60 Hz
- Selectable automatic or non-automatic operation
- Remote communications
- Load shed from emergency
Optional Delayed Transition Includes:
- Pre-transfer signal with 1 N.O. and 1 N.C. contacts
- Time delay neutral

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