2 Pole Mcb Electrical Symbol

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit its basic function is to interrupt current flow after a fault is detected.

2 pole mcb electrical symbol. Fuses and electrical protection symbols. Circuit breakers symbols for use in electrical pneumatic and hydraulic schematic diagrams. Cad name description symbol nen b 45a single pole switch nen b 45b two pole switch nen b 45c three pole switch nen b 45d two pole switch with switched neutral conductor nen b 45f four pole switch with switched neutral conductor. I know the symbol library i use show the cb as a contact with a cross on the.

Unlike a fuse which operates once and then must be replaced a circuit breaker can be reset either manually or automatically to resume. The disadvantage of all fuses is that when they have operated they must be replaced. Horizontal symbol vertical symbol description hcb2 vcb2 circuit breaker 2nd pole hcb21th vcb21th thermal 2nd pole hcb21thi vcb21thi current limit thermal 2nd pole hds21 vds21 disconnect 2nd pole hds21aux vds21aux disconnect normally open auxiliary contact hds22aux vds22aux disconnect normally closed auxiliary contact hcb2120f vcb2120f auto return hcb2121f vcb2121f with mechanical block and. Fuses are devices containing a small piece of special wire that melts when the intensity of the current flowing through it for a certain period of time exceeds a set value thus protecting the rest of the electrical circuit overloads.

Unless the mcb is a special type rcd or something else just use the standard cb block. An mcb or miniature circuit breaker is an electromagnetic device that embodies complete enclosure in a molded insulating material. 1 if the direction of change is not obvious it may be indicated by an arrowhead on the outline of the symbol. The main function of an mcb is to switch the circuit i e to open the circuit which has been connected to it automatically when the current passing through it mcb exceeds the value for which it is set.

Symbol for key diagram m v. Its basic function is to interrupt current flow after a fault is detected. May be inserted in each half of the general symbol to show the nature of change. One line diagrams company document ns 501 502.

Changer general symbol converter general symbol notes. Horizontal symbol vertical symbol description hcb1 vcb1 circuit breaker 1 pole hcb11th vcb11th thermal circuit breaker hcb11thi vcb11thi current limit thermal hcb11q9 vcb11q9 magneto thermal hcb11q13 vcb11q13 magneto thermal with differential hcb11q17 vcb11q17 differential hcb11q29 vcb11q29 with current protection hcb11q33 vcb11q33 with current protection and lack of voltage protection. Mcb is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. 2 a symbol or legend indicating the input or output quantity waveform etc.

Also keep in mind that sometimes the image shown in the symbol library is not 100 accurate.