Views: 16 Author: Site Editor Publish Time: 2022-10-08 Origin: Site
The selection of the circuit breaker should be based on the specific use conditions, select the use category, select the rated working voltage, rated current, the setting current of the release and other parameters, refer to the protection characteristic curve provided by the product sample to select the protection characteristics, and need to be short-circuit characteristics and sensitivity coefficients.
Molded case circuit breakers are also known as device circuit breakers. The outer contacts of the grounding terminal, the arc extinguishing chamber, the release and the operating mechanism are all installed in a plastic shell, auxiliary contacts, undervoltage releases and The shunt release is mostly modularized and has a very compact structure.
Generally, maintenance is not considered, and it is suitable for the protection switch of the branch circuit. Molded case circuit breakers usually contain thermal-magnetic trip units, and larger models are equipped with solid-state trip sensors.
There are two types of overcurrent releases for molded case circuit breakers: electromagnetic and electronic.
Generally, electromagnetic molded case circuit breakers are non-selective circuit breakers with only long-time delay and instantaneous protection. Electronic molded case circuit breakers have four protection functions: long delay, short delay, instantaneous and ground fault. Some new products of electronic molded case circuit breakers also have a regional selective interlock function.
It is generally used for the control and protection of distribution feeders, the main switch of the low-voltage side outlet of small distribution transformers, the control of power distribution terminals, and the power switch of various production machinery.
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Rated Current: 6A-1250A
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Miniature circuit breakers are the most widely used terminal protection devices in the construction of electrical terminal distribution devices. It is used for single-phase and three-phase short circuit, overload and overvoltage protection below 125A, including single-pole 1P, 1P+N, two-pole 2P, three-pole 3P, 3P+N, and four-pole 4P.
Miniature circuit breakers are composed of operating mechanisms, contacts, protection devices (various releases), and arc extinguishing systems.
The main contact is manually operated or electrically closed; after the main contact is closed, the free release mechanism locks the main contact in the closing position; the coil of the overcurrent release and the thermal element of the thermal release In series with the main circuit, the coil of the undervoltage release is connected in parallel with the power supply.
In the electrical design of civil buildings, miniature circuit breakers are mainly used for the protection and operation of overload, short circuit, overcurrent, voltage loss, undervoltage grounding, leakage, automatic switching of dual power sources, and infrequent starting of motors.
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Rated Current: 4A-63A
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