Circuit Breaker Information
MCBs are used to perform many functions such as local control switches, isolating switches against faults and overload protection devices for installations or specific equipments or appliances.
Circuit Breaker Dimension (Unit: mm)
Tips: How to select a miniature circuit breaker?1. Grid frequencyThe usable range of alternating current frequency is generally from 50 Hz to 60 Hz for a miniature circuit breaker.2. Rated current and rated voltage1) Rated current: The rated current of miniature circuit breaker mainly depends on the working current of protected load. The rated current of the miniature circuit breaker should be larger than the calculated load current of line within 125A. The rated current of miniature circuit breaker has different specifications including 6 A, 10 A, 16 A, 20 A, 40 A and 63A etc. There are several rated current values for over-current tripper under the same level of rating current. Therefore, the rated current of over-current tripper should approach to the actual current of electricity as possible as it could.2) Rated voltage: The rated working voltage of miniature circuit breaker should be larger than the rated voltage of line within 440V.3. Short circuit capacityShort circuit current that occurs between phase lines or between phase line and neutral line is very large, so it is required to have a certain short circuit breaking capacity, for example the rated short circuit breaking capacity of switch is equal to or less than the largest short circuit current that could occur. Because switch is not capable of arc blowout, the excessively high temperature caused by arcing makes contact point short-circuited, destroying distribution lines and equipment. Therefore, the maximum short circuit capacity should be taken full consideration into selecting miniature circuit breaker, and the rated short circuit capacity should be larger than the maximum short circuit current that could occur in line.