Thermal Magnetic Circuit Breaker Vs Electronic Trip. Electronic trip units electronic trip units typically consist of a current transformer ct for each phase a printed circuit board and a shunt trip. Their primary functions are to provide a means to manually open a circuit and automatically open a circuit under overload or short circuit conditions.
Thermal magnetic circuit breakers will meet the requirements of the electrical system design. A magnetic hydraulic circuit breaker suitably calibrated could be better choice hands down. The second component used in a thermal magnetic circuit breaker is a thermal bimetallic strip that responds to prolonged low level electrical surges or overloads of electrical currents.
Their primary functions are to provide a means to manually open a circuit and automatically open a circuit under overload or short circuit conditions.
Electronic trip circuit breakers can prov ide the additional features needed in those cases. Go back to cb tripping units electronic tripping units the electronic trip units instead use a microprocessor to process the current signal and operate the circuit breaker opening in case of fault in addition to this electronic tripping units offer more tripping criteria which are not feasible with electromechanical releases. Figure 2 tm thermal magnetic and ma magnetic tripping units. As a guideline b c d labelled circuit breakers trip at 3 to 5 times 5 to 10 times and 10 20 times the rated current respectively.
