Functions of the accessories of MCCB(molded case circuit breakers) and how to use the accessories of MCCB

Functions of the accessories of MCCB(molded case circuit breakers) and how to use the accessories of MCCB

 

accessories of MCCB(molded case circuit breakers)
accessories of MCCB(molded case circuit breakers)

The accessories of the MCCB(molded case circuit breakers) as a derivative and supplement of the function of the MCCB(molded case circuit breakers) have added more control means for the MCCB(molded case circuit breakers) and also expanded the protection function. Therefore, it has become an integral part of the MCCB(molded case circuit breakers).

1.Types of MCCB(molded case circuit breakers)accessories

The types of accessories of MCCB(molded case circuit breakers)  are divided into two types: internal accessories and external accessories.

The internal accessories are the attachments installed inside the MCCB(molded case circuit breakers), including the shunt release, under voltage release, auxiliary switch and alarm switch. External accessories are accessories attached to the exterior of MCCB(molded case circuit breakers), including auxiliary handles, external operating handles, electric operating mechanisms, handle locking devices, mechanical interlocking devices, electrical interlocking devices, rear board connection devices, and plug-in mountings. Taiwan and auxiliary contact devices.

2.Accessories representing the state ofMCCB(molded case circuit breakers)

The accessories that represent the state of the MCCB(molded case circuit breakers)  mainly include the auxiliary switch and the alarm switch. The difference between the auxiliary switch and the alarm switch is:

The auxiliary switch is mainly used for the display of the state of the MCCB(molded case circuit breakers), and the control circuit is used to control or interlock the other relevant electric devices through the combination of the MCCB(molded case circuit breaker). The alarm switch is mainly used when the MCCB(molded case circuit breaker)is disconnected due to a fault. The status shows that when the load of the MCCB(molded case circuit breaker) fails, it can be controlled or interlocked with other related electrical appliances in a timely manner.

3.Accessories to achieve undervoltage protection of MCCB(molded case circuit breakers)

The accessories for the undervoltage protection function of the MCCB(molded case circuit breakers) are mainly undervoltage release devices.The undervoltage release is a protective accessory. When the supply voltage drops to 35% to 70% of the undervoltage release's rated voltage, the undervoltage release can trip the MCCB(molded case circuit breakers); when the supply voltage is low The undervoltage release ensures that the MCCB(molded case circuit breakers)does not close at 35% of the rated voltage of the undervoltage release. When the supply voltage is higher than 85% of the rated voltage of the undervoltage release, the undervoltage release can be Ensure that the MCCB(molded case circuit breaker)is working properly.

4.Accessories for MCCB(molded case circuit breakers)Operational Functions

Accessories for the operation of MCCB(molded case circuit breakers) include shunt release, electric actuator, auxiliary handle and external operating handle.

(1)The shunt release is an accessory for realizing the remote opening of a MCCB(molded case circuit breaker). It is usually used to perform long-distance opening operation of a MCCB(molded case circuit breaker)and protection device such as a leakage relay in an emergency state. element.

(2) The electric operation mechanism is also an external accessory for the remote operation of the MCCB(molded case circuit breaker), which can be used to realize the remote tripping operation of theMCCB(molded case circuit breaker) and the closing operation of the MCCB(molded case circuit breaker).

(3) The auxiliary handle is generally used on large-capacity MCCB(molded case circuit breakers) of 600A and above for manual opening and closing operations.

(4) The external operating handle is an external accessory that has the function of converting the upper and lower toggle operations of the MCCB(molded case circuit breaker) into a rotary operation function.

5.accessories to realize the locking function and interlocking function of MCCB(molded case circuit breakers)

The accessories for the locking function and interlocking function of the MCCB(molded case circuit breakers)  mainly include a handle locking device, a mechanical interlocking device and an electrical interlocking device (also called an automatic power switching device).

(1) The handle locking device is a kind of device that enables the MCCB(molded case circuit breaker) operating handle to be reliably in the open or closed position (ie the opening or closing lock), but does not affect the mechanical protection of the free release of the MCCB(molded case circuit breaker). Device.

(2) The mechanical interlocking device is also a kind of protection device, which is mainly used in the case that the two MCCB(molded case circuit breakers) in the dual power supply circuit cannot be energized at the same time.

(3) The electrical interlock device (also called the automatic power supply switching device) is a dual power supply protection device that automatically switches.

6.Achieving accessories for multiple installation wiring ways of MCCB(molded case circuit breakers)

In addition to the most common pre-board wiring methods, there are post-board wiring methods and plug-in wiring methods for installing MCCB(molded case circuit breakers).

(1) After the board connection method, the board rear connection device is used.

(2) Plug-in wiring system adopts plug-in mounting table.

  1. Others

The auxiliary contact device is an accessory device specially designed for plug-in wiring with organic accessories.

The electric operation mechanism is not only an external accessory for the long-distance operation of MCCB(molded case circuit breakers), but it is also commonly used for on-site operation of switches above 630A (manipulation of large switches is more laborious).

MCCB(molded case circuit breakers)installation and wiring is not the same thing. According to the installation method, there are fixed type (applicable to the drawer cabinet), plug-in/draw-out type (applicable to the fixed cabinet), and according to the wiring method, both the fixed type and the plug-in/pull-out type have the front board wiring and the rear board wiring. Some products have dedicated front or rear terminals for cables or busbars.

Author Details
Sorry! The Author has not filled his profile.