Electronic circuit breakers in economy or basic versions
Block electronic circuit breakers, available in economy and basic, offer advantages over mechanical breakers. High inrush currents can be handled without problems. Electronic measurement of each channel’s current allows designers to reduce the installed power of the power supply used.
Block's electronic circuit breakers are available in two variants, economy and basic. Economy follows a thermo-magnetic curve and behaves like a standard molded circuit breaker, but much faster and more accurately based on electronic detection. High inrush currents (>50.000 µF) can be handled without problems. Block Basic series of breakers have an active current limiting implemented, which avoids any drop on the output circuits other than those affected. Based on that 100% individual channel design and sequential switch-on functionality, high inrush currents are manageable without problems or shut downs, and one single-channel failure will not shut down outputs other than the affected channel, such as some of the current E-Breakers in the market.
Electronic measurement of each channel's current allows designers to reduce the installed power of the power supply used, because there is no need for backup power for letting circuit breakers trip in case of a short.
Benefits like two-wire communication, remote reset, or signaling contacts are standard for both. Lining up 8 mechanical breakers requires approximately 5.7 in.; a Block electronic breaker needs approximately 1.7 in. If the fully remote versions are used, only a two more wires are needed for 100% remote operation.
NEC Class II breakers can be used to establish a NEC Class II circuit being supplied by the same power supply like for the other circuits. Block's E-Breakers are available with 2, 4, and 8 channels with thermal-magnetic, active current limiting, and NEC Class II characteristic.
- Christoph Wesner, Dipl.-Ing. (FH), Block USA; edited by Mark T. Hoske, content manager, Control Engineering, firstname.lastname@example.org.