Transfer Switch Types

Contactor, power frame, molded case

System Voltage

Low-voltage: Up to 600 Vac

System Current

Up to 5000 A

Core features

Advanced supervision, monitoring and control
Comprehensive diagnostics
Simple user interface
Field adaptable to changing facility needs
Remote management
Industry standard communications

View design guide (layouts, technical data and application information)

Learn about power system design basics

Manual transfer switch (MTS), molded case type
(DOCX 575 KB)
Automatic transfer switch (ATS), contactor type, ATC 300
(DOCX 339 KB)
Automatic transfer switch (ATS), contactor type, ATC 300 all frames
(DOCX 334 KB)
Automatic transfer switch (ATS), molded case type ATC 900 all frames
(DOCX 594 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, power frame type
(DOCX 600 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 300
(DOCX 343 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 900
(DOCX 356 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 900 1600 A frame and below
(DOCX 607 KB)

spacer

ATS Health & Maintenance Watch

Eaton’s ATC-900 controller is equipped with innovative features that manage maintenance tasks and report transfer switch condition making it easy for facility personnel to comply with maintenance program requirements and proactively plan corrective action in critical power applications. The intelligent ATC-900 firmware:

Monitors and reports equipment condition
Schedules routine inspection, maintenance, and test activities
Generates maintenance due notifications and equipment condition alerts
Provides maintenance task guidance per NFPA^® 110 – the standard for emergency and standby power systems
Maintains a record of completed activities

Download brochure

Automatic transfer switches

Reliable, rugged, versatile and compact assemblies for transferring essential loads and electrical distribution systems from one power source to another.

Watch the following videos to learn more:

What is WCR in automatic transfer switches?
Choosing a transfer switch
Recent change to National Electric code
UL1008 Short-circuit WCRs

Monitor and control transfer switches from a single intuitive touch screen interface.

Find out how

The switch to Eaton should be automatic

Learn about Eaton’s wide range of ATS solutions that provide backup power to the world

Specifications

View design guide (layouts, technical data and application information)

Learn about power system design basics

Manual transfer switch (MTS), molded case type
(DOCX 575 KB)
Automatic transfer switch (ATS), contactor type, ATC 300
(DOCX 339 KB)
Automatic transfer switch (ATS), contactor type, ATC 300 all frames
(DOCX 334 KB)
Automatic transfer switch (ATS), molded case type ATC 900 all frames
(DOCX 594 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, power frame type
(DOCX 600 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 300
(DOCX 343 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 900
(DOCX 356 KB)
Automatic transfer switch (ATS) & bypass isolation ATS, contactor type, ATC 900 1600 A frame and below
(DOCX 607 KB)

spacer

Ratings

SYSTEM VOLTAGE	Low voltage: Up to 600 Vac
SYSTEM CURRENT	Up to 5000 A
SYSTEM FREQUENCY	50 or 60 Hz

Standards

THIRD PARTY APPROVAL / RECOGNITION

Download Links

Brochures

ATS Health & Maintenance Watch brochure

This document provides an overview of how to optimize transfer switch reliability through equipment condition monitoring and efficient maintenance.

(PDF 2 MB , 06/14/2023)
Automatic transfer switch (ATS) family brochure

This brochure provides an overview of Eaton's broad range of low voltage transfer switch product offerings available for use in today's critical power market..

(PDF 8 MB , 01/09/2025)
Automatic transfer switch controller, ATC-300+, product aid

This document reviews the features and benefits of the ATC-300+ controller

(PDF 231 KB , 12/06/2021)
Automatic transfer switch controller, ATC-900, product aid

This document reviews the features and benefits of the ATC-900 controller

(PDF 93 KB , 07/10/2023)
HMi remote annunciator controller (7-inch), product aid

This document reviews the features and benefits of the hmi remote annunicator controller

(PDF 2 MB , 05/01/2017)

Design guides

Automatic transfer switch (ATS) controllers and remote annunciators design guide

This design guide provides dimensions, layout examples, technical specifications and application information for ATS controllers and annunciators. The information in this document supersedes section 25 of the Consulting Application Guide (CAG).

(PDF 4 MB , 11/26/2024)

Installation instructions

Automatic transfer switch controller, ATC-100 operation and maintenance manual

This document contains operation and maintenance instructions for ATC-100 automatic transfer switch controllers.

(PDF 1 MB , 01/01/2012)
Automatic transfer switch controller, ATC-300+ operation and maintenance manual

This document contains operation and maintenance instructions for ATC-300+ automatic transfer switch controllers.

(PDF 1 MB , 11/01/2024)
Automatic transfer switch controller, ATC-600/800 to ATC-900 field kit instruction leaflet

This document contains field upgrade instructions for replacing an ATC-600/800 controller with an ATC-900 controller.

(PDF 1 MB , 09/01/2015)
Automatic Transfer Switch Controller, ATC-900 Operation and Maintenance Manual

Eaton, automatic transfer switch controller, ATC-900, operation and maintenance manual

(PDF 7 MB , 04/02/2024)
Ethernet HMi RAC and Gateway Setup Instructions

This document contains setup instructions for a 7-inch HMi remote annunciator controller (RAC) for use with automatic transfer switches equipped with an ATC-300+ or ATC-900 controller.

(PDF 772 KB , 11/22/2024)
HMi remote annunciator controller (RAC) for use with automatic transfer switch controllers, instruction booklet

This document contains operation instructions for a 7-inch HMi remote annunciator controller (RAC) for use with automatic transfer switches equipped with an ATC-300+ or ATC-900 controller

(PDF 690 KB , 01/15/2023)

Product specification guides

Software, firmware, and applications

ECISoft V1.00.08

This softwares allows the user to configure an ELC-CAENET communication module

(ZIP 8 MB , 10/01/2021)
Transfer switch controller, setpoint editor (EASE v1.14)

This software allows the user to easily create, edit and save setpoint configuration files for upload to an ATC-900 controller.

(ZIP 502 KB , 08/01/2023)

Technical data sheets

Automatic transfer switch controller, ATC-900, technical document

This document reviews the technical features, specifications and configuration information for the ATC-900 controller

(PDF 3 MB , 05/15/2023)
Modbus communication guide, ATC-300+ controller

This document contains Modbus communication information for the ATC-300+ controller

(PDF 1 MB , 04/15/2020)
Modbus, ATC-900 controller communication guide

This document contains Modbus communications information for ATC 900 controllers

(PDF 1 MB , 07/11/2023)
Transfer Switch Communications

Transfer Switch Communications

(PDF 2 MB , 01/22/2025)

White papers

3-pole and 4-pole transfer switch switching characteristics

This document provides a detailed discussion about switching the neutral connection in 3-pole and 4-pole transfer switches when transferring a load between two three-phase sources.

(PDF 3 MB , 09/08/2021)
Enhance reliability and uptime of data centers with intelligent automatic transfer switches

This documents discusses how an intelligent automatic transfer switch can help solve challenges in data center applications.

(PDF 994 KB , 07/06/2023)
Monitoring the integrity of the engine generator remote start circuit in an emergency system

This paper provides an overview of recent changes in the National Electrical Code (NEC) pertaining to a generator remote start circuit for use in an emergency system and provides a code-compliant solution that can be implemented with one or more transfer switches using common technology.

(PDF 100 KB , 09/01/2019)
Transfer switch 101

This document provides an introductory guide to picking the right transfer switch for your environment.

(PDF 165 KB , 03/01/2015)

Informational videos

Learn about the fundamentals of automatic transfer switches.

Learn more

Contact me form

Phone

877-277-4636 or 877-ETN-CARE

Sales support email

salessupportATS@eaton.com

Locate a channel partner

Tech support email

atstechsupport@eaton.com

Automatic transfer switch controllers and remote annunciators

Core features

View design guide (layouts, technical data and application information)

Learn about power system design basics

Guide specs

ATS Health & Maintenance Watch

Automatic transfer switches

Remotely manage multiple transfer switches

The switch to Eaton should be automatic

View design guide (layouts, technical data and application information)

Learn about power system design basics

Guide specs

Ratings

Standards

Brochures

Design guides

Installation instructions

Product specification guides

Software, firmware, and applications

Technical data sheets

White papers

Informational videos

New to ATS?

Automatic transfer switch controllers and remote annunciators

Core features

View design guide (layouts, technical data and application information)

Learn about power system design basics

Guide specs

ATS Health & Maintenance Watch

Automatic transfer switches

Remotely manage multiple transfer switches

The switch to Eaton should be automatic

Related products

View design guide (layouts, technical data and application information)

Learn about power system design basics

Guide specs

Ratings

Standards

Brochures

Design guides

Installation instructions

Product specification guides

Software, firmware, and applications

Technical data sheets

White papers

Informational videos

New to ATS?

Let's talk big ideas