Automatic Transfer Switch Buyer's Guide

A standby generator is basically brain dead without an automatic transfer switch.

Automatic transfer switches are similar to the thermostat in your house.

Instead of monitoring temperature, an automatic transfer switch monitors utility power.

When the power goes out, the automatic transfer switch tells the generator to start.

To select a switch, simply select the right amps and style.

Select Amps

Automatic transfer switches come in a variety of sizes, ranging from 100- to 200- to 400-Amps.

In most cases, you simply match the transfer switch to main breaker on your electrical panel.

For example, if you have a 200-amp main breaker, you'll need a 200-amp automatic transfer switch.

Select Style

There are basically two styles of automatic transfer switches.

1. Standard Installation
The most common option is to install it inside the home next to the main distribution panel. Your electrician will also need to install a sub-panel to manage the load properly.







2. Service Disconnect
A better option is to get a “service disconnect” automatic transfer switches instead.

These transfer switches are connected between your home’s utility meter and the main circuit panel.

While the initial cost for the service disconnect is higher, you don't need to buy a sub-panel, and they are typically easier to install.