Eaton's Cutler-Hammer Automatic Transfer Switches are reliable, rugged, versatile and compact assemblies for transferring essential loads and electrical distribution systems from one power source to another.

Transfer switches can be supplied in separate enclosures for standalone applications, or can be supplied as an integral component in the following equipment:

• MagnumT DS Switchgear
• Pow-R-Line CT Switchboards
• Motor Control Centers
• Panelboards

Application Description
A transfer switch is a critical component of any emergency or standby power system. When the normal (preferred) source of power is lost, a transfer switch quickly and safely shifts the load circuit from the normal source of power to the emergency (alternate) source of power. This permits critical loads to continue running with minimal or no outage. After the normal source of power has been restored, the re-transfer process returns the load circuit to the normal power source.
Transfer switches are available with different operational modes including:

• Manual
• Automatic
• Non-Automatic
• Bypass/Isolation

The power switching operation of transfer switches may be separated into the three (3) key categories of:

• Open Transition - Break-before-Make operation.
• Closed Transition - Make-before-Break operation.
• Closed Transition Soft Load - Both sources are paralleled and can remain so indefinitely.

The three (3) basic components of a transfer switch are:

• Power switching device to shift the load circuits to and from the power source.
• Transfer Logic Controller to monitor the condition of the power sources and provide the control signals to the power switching device.
• Control power source to supply operational power to the controller and switching device.

All Eaton transfer switches are designed to meet the requirements set forth by UL 1008, however, all transfer switches are not created equal. You can be assured of safe and reliable operation from all types of transfer switches that Eaton offers.

Residential
Residential Transfer Switches (100-200A)

Agricultural
Wall Mount Transfer Switches (30-1000A)

Construction
Wall Mount Transfer Switches (30-1000A)
Magnum Floor Mount Transfer Switches (200-5000A)
Magnum Bypass/Isolation Transfer Switches (200-5000A)

Industrial
Wall Mount Transfer Switches (30-1000A)
Magnum Floor Mount Transfer Switches (200-5000A)
Magnum Bypass/Isolation Transfer Switches (200-5000A)

Aftermarket and Support
Aftermarket and Renewal Parts
Vintage and Other Products
Application and Startup Support