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China FZN25-12D Series High Voltage Vacuum Load Switch - Reliable Suppliers and Factory for 12kV Solutions

The FZN25-12D Series is a cutting-edge indoor high voltage vacuum load switch specifically engineered for 12kV, 50Hz three-phase AC systems. As one of the leading products from China, this load switch is perfect for ring networks and terminal power supply applications. It boasts a reliable direct-acting mechanism that links the isolating fracture with a vacuum interrupter, ensuring effective load management. The composite apparatus model FZRN25 integrates a fuse to safely interrupt any current up to the rated short-circuit values. This compact and lightweight switch can be operated both manually and electrically, promoting user-friendly maintenance practices. Designed with interlocked grounding for enhanced safety and compliance with class II pollution standards, it exemplifies the quality manufacturing processes of top Suppliers and manufacturers in the industry

Product Details

Technical Specification

No.	Item		Units	Parameters
				FZN25-12D/T630-20	FZRN25-12D/T125-31.5
1	Rated voltage		kA	12
2	Rated frequency		HZ	50
3	Rated Current		A	630	125
4	Rated insulation level	1min frequency voltage	KV	Interrupter Fracture 30. On the ground, white 42. Isolation Fracture 48
		Lightning impulse withstand voltage	KV	On the ground, white 75. Isolation Fracture 85
5	Rated dynamic stability current (peak)		KA	50	-
6	4S thermal current		KA	20	-
7	Rated active load breaking current		A	630	125
8	Rated closed-loop breaking current		A	630	125
9	Rated cable charging breaking current		A	10	10
10	Breaking load transformer		KVA	1250	1250
11	Rated short-circuit breaking current		KA	-	31.5
12	Rated transfer current, rated current transfer		A		2000
13	Fuse Model			-	SDLAJ-12 / SFLAJ-12
14	Impact energy output		J	-	2–5 (medium)
15	Rated short circuit making current		KA	50
16	Ground switch rated dynamic current			50
17	Grounding switch 2S thermal current		KA	20
18	Secondary circuit rated voltage		V	AC/DC 220 / 110
19	Mechanical life		Times	1000

Product Model

Dimension

Frequently Asked Questions

Q1 What is the rated voltage of the FZN25-12D and FZRN25-12D switchgear?

Both the FZN25-12D/T630-20 and FZRN25-12D/T125-31.5 models are designed for a rated voltage of 12 kV, making them suitable for medium-voltage distribution systems.
Q2 What is the difference in rated current between the two models?

The FZN25-12D/T630-20 has a rated current of 630 A, while the FZRN25-12D/T125-31.5 has a rated current of 125 A. The FZRN25 model also includes a fuse combination unit for short-circuit protection up to 31.5 kA.
Q3 Does the FZRN25-12D model support short-circuit breaking capability?

Yes. The FZRN25-12D/T125-31.5 features a rated short-circuit breaking current of 31.5 kA, achieved through its integrated fuse (SDLAJ-12 / SFLAJ-12), which provides reliable fault interruption in demanding grid environments.
Q4 What is the mechanical life expectancy of these switchgear units?

Both models are rated for a mechanical life of 1,000 operations, ensuring long-term reliability and reduced maintenance requirements in substation and ring main unit applications.
Q5 What secondary circuit voltage does the switchgear support?

The secondary circuit supports both AC and DC operating voltages of 220 V and 110 V, providing flexibility for integration with various control and protection relay systems.
Q6 What is the lightning impulse withstand voltage level for these units?

The lightning impulse withstand voltage is 75 kV to ground and 85 kV across the isolation fracture, ensuring robust insulation performance against transient overvoltages in accordance with standard medium-voltage requirements.