3CJ2 Switch-Disconnectors

A switch-disconnector is to be understood as the combination of a switch and a disconnector, or a switch with isolating distance..

3CJ2 Switch-Disconnectors

The medium-voltage switch-disconnector 3CJ2 is designed according to the clear disconnector principle. Proven hard-gas flat arcing chambers provide a higher switching capacity than that of its competitors. Simple blade contacts and a torsion-bar spring-operated mechanism increase its making capacity and the mechanical endurance. While connecting consumers, making on an existing shortcircuit cannot be excluded. That is why, today, switchdisconnectors generally feature a short-circuit making capacity. In combination with fuses, switch-disconnectors can also be used to break short-circuit currents. The short-circuit current is interrupted by the fuses. Subsequently, the fuses trip the three poles of the switch-disconnector, disconnecting the faulty feeder from the power system.

without fuse assembly

A welded base frame carries the disconnector arrangement and the flat arcing chambers.
Furthermore it contains the spring-operated mechanism (high-speed closing and high-speed opening), or the stored-energy mechanism (storage of high-speed closing/opening, manual tripping and free tripping).
Optionally, the switch-disconnector can also be equipped with a make-proof earthing switch or a fuse assembly.

with fuse assembly

Switch-disconnectors are supplied according to category A (20 breaking operations at rated current).
A special version with category B (100 breaking operations at rated current) is possible. The 3CJ2 can be wall-mounted with the isolating contact side upwards or downwards, as well as on the floor or on the ceiling – in inverted position. For wall mounting, the preferred mounting position is with the isolating contact side upwards.

Technical Data

Product range overview

Rated
voltage
(kV)

Type of operating
mechanism

Rated normal current (A)

400

630

1000

12

Spring-operated (SPR)

Stored-energy (STO)

17.5

Spring-operated (SPR)

Stored-energy (STO)

24

Spring-operated (SPR)

Stored-energy (STO)

36

Spring-operated (SPR)

Stored-energy (STO)

□ 3CJ2 with fuse assembly
■ 3CJ2 without fuse assembly

Standards
The switch-disconnectors conform to the following standards and recommendations:

  • VDE 0671-102 (former VDE 0670 Part 2)

  • VDE 0670-301 (former VDE 0670 Part 3)

  • IEC 129

  • IEC 60265-1

  • IEC 60694 (VDE 0670 Part 1000)

  • IEC 62271-105 (VDE 0670 Part 303/9.94)


Dimensions


Sample for 12 kV

Sample for 12 kV

With fuse assembly

Rated voltage

Normal current

12 kV

400 A

 

Sample for 12 kV

With fuse assembly

Rated voltage

Normal current

12 kV

630 - 1000 A

Please find additional dimension drawings and data in our catalogue.