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Fzrn21-with Fuse Combination Unit High Voltage Load Break Switch

Basic Info

Model No.:  FZRN21-12D/T125-31.5

Product Description

Model NO.: FZRN21-12D/T125-31.5

Usage: Breaking&Making Load Current

Number of Switch: Multi Control Switch

Environment: Indoor High Voltage

Application: Indoor Power Distribution

Trademark: YF

Function: Industry

Pole: 3

Certification: SGS, ISO9001, CE

Test Equipment: IEC Standard

Protection: Circuit-Break Failure Protection

Origin: Jiangyin Yunfeng, China

Product Overview

YFZN21(FZN21)-12 indoor AC HV load switch and load switch-fuse combination unit is applied in the indoor power distribution net with the rated voltage of 12kV and frequency of 50Hz for breaking and making the load current. It has advantages of compact structure, long electrical endurance, availability for frequent operation, basically no maintenance, strong breaking and making capacity, safety, reliability and obvious isolating fracture, ect. Its performance meets requirements of GB 3804-2004 High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5kV and GB 16926-2009 High-voltage alternating current switch-fuse combinations.

Model Specification

Fzrn21-with Fuse Combination Unit High Voltage Load Break Switch

Fzrn21-with Fuse Combination Unit High Voltage Load Break Switch


---compact structure

---long electrical endurance

---availability for frequent operation

---basically no maintenance

---strong breaking and making capacity

---safety, reliability and obvious isloating fracture

Service Conditions


2.Ambient temperature-25ºC-+ 40ºC;

3.The daily average of relative humidity shall not be larger than 95% and the monthly average shall not be larger than 90%:

4.The ambient air shall not be subject to the obvious pollution such as corrosive or combustible gas and steam;

5.The site without fire hazards and explosion hazards;

6.The site that the seismic intensity does not exceed degree 8; the gradient shall not exceed 5°

Main Technical Paramenters

Serial No. Item Unit YFZRN21-12 Load Switch-Fuse Combination Unit
1 Rated voltage kV 12
2 Rated frequency Hz 50
3 Rated current A Max.rated current of fuse 125A;
4 Rated short-circuit breaking current of fuse kA 31.5;
5 Rated breaking-transfer(handover)current A 2000
6 Rated active load breaking current A 630
7 5% rated active load breaking current A 31.5
8 Rated closed loop breaking current A 630
9 Rated cable charging breaking current A 10
10 Rated line charging breaking current A 1
11 Rated earthing fault breaking current A 30
12 Rated cable charging breaking current under earthing fault conditions A 17.4
13 Rated short-time withstand current(thermal ---Load switch(including disconnector) kA/s 20/4
stability current) ---Earthing Switch kA/s 20/2
14 Rated short-circuit making current kA 50
15 Rated peak withstand current(dynamic current) kA 50
16 1 min power-frequency withstand voltage(effective value)to earth,phase-to-phase,vacuum fracture/isolating fracture kV/kV 42/48
17 Full-wave lightning impluse withstand voltage(peak) to earth,phase-to-phase,vacuum fracture/isolating fracture kV/kV 75/85
18 Main loop resistance μΩ ≤120
19 Mechanical life Time 10000
20 Clearance between open contacts mm 9±1
21 Overtravel(compression length of contact spring) mm
22 Gross thickness of contact wear mm 3
23 Average opening speed m/s 0.8~1.2
24 Average closing speed m/s 0.45~0.85
25 Rated contact pressure N 900±200
26 Connact closing bounce time ms ≤2
27 Three-phase opening and closing asynchronization ms ≤1
28 Inter-pole center distance mm 210±3
29 Distance between live parts and of phase to earth mm ≥125
30 Closing operation torque of vacuum arc-extinguishing chamber N.m ≤80
31 Opening operation force of vacuum arc-extinguishing chamber N ≤10
32 Rated closing operation voltage V ≌220/110
33 Rated opening operation voltage V ≌220/110
34 Time of switch opening triggered by breaking of fuse ms 35±5
35 Impact output energy at breaking of fuse J(Joule) 1

Note: The sensor with live display can be used for the Switch Insulator

Fzrn21-with Fuse Combination Unit High Voltage Load Break Switch

Selection of HV current-limiting fuse

Transformer capacity(kVA) 100 125 160 200 250 300/315 400 500 630 750/850 1000 1250 1600 2000 2500
Rated current of fuse(A) 16 16 16 20 25 31.5 40 50 63 80 80 100 125 160 200

The model of recommended fuse is XRNT-12HV current-limiting fuse;

The impact output energy of recommended fuse is:1J(Joule) middle-sized.

Fzrn21-with Fuse Combination Unit High Voltage Load Break Switch

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