Breaker Type Switch

The transfer switches pictured here is a breaker type transfer switch. Breaker switches use two circuit breakers to switch the load. One for utility and one for emergency power.

The breakers are interlocked so that they both cannot close together.

Cannot be serviced properly because you cannot access the contacts. NFPA 110, 2010 edition, 8.3.5 (4)
Damaged contacts cannot be replaced.

Click on this link for an excellent article on breaker switches.

Watch this detailed video on Transfer Switches, What is an Automatic Transfer Switch

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