FZRN21-12D indoor vacuum load break switch and fuse combination apparatus applies to power system of rated voltage 12KV, AC 50/60Hz. It distributes power, control and protect electric apparatus. The apparatus replace expensive VCB to service in electricity network. It can also be used in rural and unban power supply systems to break and make under rated current and short-circuit current when the circuit breaks down. It is also applicable to control and protect transformers.
1、The load-breaking switch is an interlock device of three-phase.
2、The VCB is operated by electric spring or dependent manual.
3、The opening operation is of both dependent manual and dependent power.
4、There is reliable interlock between vacuum arc-extinguish chamber, disconnect blade and grounding blade.
5、When the fuse breaks down, the load-breaking switch opens by the interlock mechanism.
6、The load break switch can be mounted in switchgear and hang-on the wall to protect transformers.