What is a DC rated battery circuit breaker (BCB)?

These can be equipped with a monitoring device connected to the UPS or BMS to warn if a fuse has tripped or is disconnecting the battery from the UPS. The DC rated Battery Circuit Breaker (BCB) provides still overcurrent protection, if correctly coordinated, even though it is not as fast as the fuses.

Should I use a standard AC circuit breaker in a DC application?

A common but dangerous mistake is using a standard AC circuit breaker in a DC application to save costs. This should never be done. The fundamental difference lies in how they handle an electrical arc—the dangerous surge of energy that forms when a circuit is interrupted.

What is the Eaton DC breaker family?

The Eaton DC breaker family is engineered to address the highest performance requirements while providing numerous accessories to fit different site specifications.

Which breaker is best for a battery energy storage system?

Battery Energy Storage Systems (BESS) are bidirectional, meaning current flows out during discharge and in during charging. This makes the choice of breaker critical. Polarized Breakers: These breakers use permanent magnets and work only when current flows in one direction (from the “+” to the “-” terminal).

How do Eaton DC Breakers work?

Eaton DC breakers have a contact design that forces the contact arms apart with magnetic repulsion during fault conditions. Thermal-magnetic trip units provide reliable overload and superior short-circuit protection and are engineered to protect the wire and the equipment downstream of the circuit breaker from damage.

Why is a circuit breaker important?

The circuit-breakers have a major role in an installation but their importance often appears at the time of accidental events which are not frequent. The best sizing of UPS and the best choice of configuration can be compromised by a wrong choice of only one circuit-breaker. Figure N25 shows how to select the circuit-breakers.