OEM FK(R)N12-12 High Voltage Air Load Breaker Fuse Switch Supplier, Companies

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OEM FK(R)N12-12 High Voltage Air Load Breaker Fuse Switch Supplier, Companies

The FKN12-12D load switch and FKRN12-12D switch-fuse combination are designed for 12kV three-phase distribution systems, suitable for transformer, cable, and line control. With rated currents of 630A (FKN) and 125A (FKRN), they feature high insulation, spring-operated mechanisms, and reliable arc extinction in bell-shaped covers. Compact and interlocked, they offer 2000 mechanical operations and withstand harsh environments (–25°C to +40°C, ≤2000m). Ideal for substations and ring networks, these GB/T and IEC-compliant switches ensure safe load switching, overload protection, and short-circuit interruption in urban and industrial applications.

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Product Description

Type & Meaning

Code	Specification Meaning
1	Rated short-time withstand current (kA)
2	Rated current (A)
3	Spring mechanism
4	Earthing switch (optional)
5	Rated voltage (kV)
6	Design No.
7	Indoor
8	Air medium
9	Load switch

Code	Specification Meaning
1	Rated short-circuit breaking current (kA)
2	Rated current of the maximum fuse equipped (A)
3	Spring mechanism
4	Earthing switch (optional)
5	Rated voltage (kV)
6	Design No.
7	Indoor
8	With fuse holder
9	Air medium
10	Load switch

Ambient Conditions

Ambient temperature: -25℃ ~ +40℃
Altitude: ≤ 2000m
Ambient humidity: Daily mean relative humidity ≤ 95%, monthly mean ≤ 90%
Seismic intensity: ≤ Ms8
Anti-fouling level: Class Ⅱ
Operating environment: Free of flammable or explosive hazards, chemical corrosive gases, water vapor, and violent vibration.

Note: Please negotiate with the manufacturer if environmental conditions exceed the above parameters.

Product Display

HV Load Breaker Fuse Switch - Right View

Technical Parameters

☆ Technical parameters of FKN12-12D series switch and FKRN12-12D series switch-fuse combinations are shown in Table 1

No.	Item			Unit	FKN12-12D	FKRN12-12D
1	Rated voltage			kV	12	12
2	Rated frequency			Hz	50	50
3	Rated current			A	630	125
4	Rated insulation level	1min power-frequency withstand voltage	To-ground, phase-to-phase	kV	42	42
		1min power-frequency withstand voltage	Isolating distance		48	48
		Lightning impulse withstand voltage (peak)	To-ground, phase-to-phase		75	75
		Lightning impulse withstand voltage (peak)	Isolating distance		85	85
5	Rated short-time withstand current		Load switch	kA	25	-
5	Rated short-time withstand current		Earthing switch	kA	20	-
6	Rated short-circuit duration		Load switch	S	4	-
6	Rated short-circuit duration		Earthing switch	S	2	-
7	Rated short-circuit making current (peak)			kA	50	-
8	Rated breaking current		Active load breaking current	A	630	-
			Closed loop breaking current		630	-
			Cable charging current		10	-
			Breaking capacity of no-load transformer	kVA	1250	-
9	Rated short-circuit breaking current (current-limit fuse)			kA	-	31.5
10	Rated transfer current			A	-	1200
11	Mechanical endurance			times	2000	2000

☆ Mechanical properties are shown in Table 2

No.	Item	Unit	Parameter
1	Isolating distance	mm	≥175
2	Phase-to-phase central distance		210±2
3	Phase-to-phase air clearance		≥125
4	Travel		210±4
5	Overtravel		≥40
6	Out of simultaneity of three-phase closing	ms	≤10
7	Out of simultaneity of three-phase opening		≤15
8	Inherent opening time of shunt release		40~65
9	Main circuit resistance	μΩ	≤130

☆ For the current-limiting fuse in switch-fuse combinations, the rated current of the fuse-link is selected based on the transformer capacity (Table 3):

Transformer capacity (kVA)	100	125	160	200	250	315	400	500	630	750/800	1000	1250
Rated current of fuse (A)	10	12.5	16	20	25	31.5	40	50	63	80	100	125

Outline and Installation Dimensions

Frequently Asked Questions

1. What is the difference between the FKN12-12D and FKRN12-12D models?

The FKN12-12D is a high-voltage air load break switch, whereas the FKRN12-12D is equipped with an integrated fuse base to accommodate current-limiting fuses, providing enhanced short-circuit breaking capability up to 31.5 kA.

2. What are the standard ambient operating conditions for this switchgear?

Standard operation requires an ambient temperature between -25°C and +40°C, an altitude not exceeding 2000 meters, relative humidity averaging ≤95% daily (≤90% monthly), seismic tolerance up to Ms8, and an environment free of corrosive gases, water vapor, or explosive hazards.

3. What is the rated mechanical endurance of the switch?

Both the FKN12-12D switch and FKRN12-12D fuse-switch combination have a tested mechanical endurance rating of 2,000 operation cycles.

4. Which fuse rating is recommended for a 500 kVA transformer?

According to the technical selection table (Table 3), a 50 A rated current-limiting fuse link is recommended for a 500 kVA transformer application.

5. Can this equipment be installed in environments higher than 2000m above sea level?

Standard configurations are rated for altitudes up to 2000m. For higher altitudes or specialized environmental requirements, technical parameters must be negotiated directly with the manufacturer for custom adaptation.

6. What is the insulation performance level for this 12 kV equipment?

It features a 1-minute power-frequency withstand voltage of 42 kV (phase-to-phase and to-ground) / 48 kV (isolating distance), and a lightning impulse withstand peak voltage of 75 kV (to-ground/phase-to-phase) / 85 kV (isolating distance).