Circuit Breaker Type Automatic Transfer Switches
The above contactors are examples of breaker type automatic transfer switches.
A circuit breaker type transfer switch is adapted using available technology like a circuit breaker or lighting contactor rather than purpose built for its intended use.
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.
Breaker and lighting contactor switches do not allow for Fire code required inspection and maintenance.
They are not field accessible. These devices must be removed and sent to the manufacturer for service.
Click on this link for an excellent article on breaker switches.
For more information on transfer switches see my videos:
What is an Automatic Transfer Switch
Automatic Transfer Switch Annual Service
Automatic Transfer Switch Sequence of Operation
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