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FZRN21-12D Indoor AC High Voltage Vacuum Load Break

Summary
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 urban power supply sys tems 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.

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Product name:
FZRN21-12D Indoor AC High Voltage Vacuum Load Break
Switch and Fuse Combination Apparatus

Summary
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 urban power supply sys tems 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.

Ambient condition
1. Altitude: 1000m;
2. Ambient temperature: -25 ~+40 ;
3. Relative humidity: daily average 95 , monthly average 90 ;
4. Earthquake intensity: 8 degree;
5. Applicable occasions should fre e from inflammables, explosives, corrosives
and severe vibration.

Product feature

The load-breaking switch is an interlock device of three-phase. The VCB is operated by electric spring or dependen t manu al. The opening operation is of both dependent manual and dependent power. There is reliable interlock between vacuum arc-extinguish chamber, disconnect blade and grounding blade. When the fuse breaks down, the load-breaking switch opens by the interlock mechanism. The load break switch can be mounted in switchgear and hang-on the wall to protect transformers.


No. HRC Fuse Unit Data
1 Rated voltage kv 12
2 Rated frequency hz 50/60
3 Rated maxim current of fuse A 125
4 Transfer current A 1550
5 Opening duration of switch activated by fuse MS 40+-5
6 Rated short-circuit breaking current KA 31.5
7 Rated short-circuit making current (peak) KA 80
8 1min. PF withstand voltage 
(phase to phase/to earth, across open contacts)
KV 42/49
9 Lightning impulse withstand voltage 
(phase to phase/to earth, across open contacts)
KV 75/85
10 Fuse impinger model KV MIDDLE
No. LBS
1 Rated voltage KV 12
2 Rated frequency HZ 50/60
3 Rated current A 630
4 Rated active load breaking current A 630
5 Rated closed-loop breaking current A 630
6 5% of active load breaking current A 31.5
7 Rated breaking current of charging cable A 10
8 Rated breaking current of no-load transformer A No-load current of 
1250kVA transformer
9 1min. PF withstand voltage(phase to 
phase/to earth, across open contacts)
KV 42/49
10 Lightning impulse withstand voltage 
(phase to phase/to earth, across open contacts)
KV 75/85
11 4s rated short-time withstand current KA 31.5
12 Rated peak withstand current KA 80
13 Rated short-circuit making current KA 80
14 Mechanical life TIMES 10000
15 Permissible corrosion thickness of contact MM 2
16 C/O operating moment N*M ≤200

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