FZ(R)N25-12 load break switch and combination appliance is a three-phase high voltage switch equipment with a rated voltage of 10kV and a rated frequency of 50Hz. It is suitable for power distribution centers and substations of industrial and mining enterprises. This product is designed to protect and control breaking/making load current, closing loop current, no-load transformer and cable charging current, and combine short-circuit current. The load switch equipped with a grounding switch can withstand short-circuit currents. It is available with both manual and electric operating mechanisms, facilitating the implementation of "Three Remote" (remote control, remote signaling, and remote measurement) requirements in power system engineering.

FZ(R)N25-12 load break switch and combination

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	10
2	Rated Frequency	Hz	50/60
3	Rated Current	A	≤630
4	Rated Power Frequency Withstand Voltage	kV	48(Across the Contact Gaps) / 42(To Ground)
5	Rated Lightning Impulse Withstand Voltage	kV	75
6	Rated Prospective Short-Circuit Breaking Current (Fuse)	kA	31.5
7	Rated Short-Time Withstand Current (Peak)	kA	50
8	Rated Short-Time Withstand Current	kA	20
9	Rated Duration of Short-Time Withstand Current	s	2
10	Rated Breaking Take-over Current	A	3150
11	Mechanical Endurance	Times	10000

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	6~7
2	Contact Overtravel	mm	2±0.5
3	Average Closing Speed	m/s	0.6±0.2
4	Average Opening Speed	m/s	0.9±0.2
5	Contact Bouncing Duration at Closing Operation	ms	≤3
6	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤3
7	Maximum Manual Operating Torque	N.m	≤160
8	Isolation Fracture Distance of Contact	mm	≥130

Product Advantages

FZ(R)N25-12 load break switch and combination appliance has many advantages:

Reliable performance：

The product adopts a vacuum interrupter for arc extinguishing, ensuring stable and reliable performance, long electrical life, high breaking frequency, strong making and breaking capabilities, and easy operation and maintenance.

Compact design:

Integrates the switch body and operating mechanism into one unit, combining an isolating switch, load switch, and grounding switch, resulting in a compact and small structure.

High stability:

Features a direct-acting isolation fracture and a vacuum interrupter arranged in series, with high dynamic and thermal stability current parameters; unique operation procedure linkage ensures that operations are completed in one step.

Safety interlock:

The vacuum load switch, grounding switch, shutter, and switchgear door are strictly interlocked according to the "Five Prevention" mechanical interlock system, preventing misoperation and ensuring safety and reliability.

Versatile operation:

The spring-operated mechanism can perform both electrical and manual switching operations, facilitating the implementation of "Three Remote" (remote control, remote signaling, and remote measurement) requirements.

Product Applications

FZ(R)N25-12 load break switch and combination appliance has many applications:

Industrial and mining enterprise distribution substations and transformer stations

Box-type transformer station user terminals

Urban community distribution systems

Products Picture show

FZRN25-12 Load Break Switch and Combination Appliance 1

Product Outline Drawing

FZRN25-12 Load Break Switch and Combination Appliance manufacturer

Figure 1: FZ(R)N25-12 right-side vertical mounting

FZRN25-12 Load Break Switch and Combination Appliance factory

Figure 2: FZ(R)N25-12 left-side vertical mounting

Remarks:

1. Besides the two standard configurations mentioned, the FZ(R)N25-12 series can be installed in an inverted position depending on the application.

2. The FZ(R)N25-12 can also be provided without a grounding knife or fuse.

Secondary Wiring Diagram

FZRN25-12 Load Break Switch and Combination Appliance supplier

Figure 3: Electric operation wiring diagram

No.	Code	Name	Quantity	Note
1	DL	Auxiliary Switch	1	F10-10
2	U1, U2	Single-Phase Rectifier Bridge	2	KBPC2510
3	CK	Micro Switch	1	Grounding Knife Micro Switch
4	TQ	Opening Electromagnet	1
5	M	Energy Storage Motor	1	ZYJ-66-01(F25)
6	JX	Terminal Block	1	TD660V-15A

FZRN25-12 Load Break Switch and Combination Appliance in stock

Figure 4: Manual operation wiring diagram

No.	Code	Name	Quantity	Note
1	DL	Auxiliary Switch	1	F10-10
2	U1	Single-Phase Rectifier Bridge	1	KBPC2510
3	TQ	Opening Electromagnet	1
4	JX	Terminal Block	1	TD660V-15A

Applictaion of FZ(R)N25-12 Load Break Switch

Where FZ(R)N25-12 Load Break Switch is used?

The FZN25-12D is mainly used in ring main units, prefabricated substations, dual-radial power supply units, and distribution cabinets in industrial and mining enterprises and high-rise buildings. It is one of the most commonly used load switches in 10kV power distribution systems.

FZN25-12D Load Break Swith can be used in these Switchgears: HXGN-12,XGN15-12 series, KYN28 series, YBW and ZGS.

Application Area	Specific Use Cases
Industrial & Commercial	Industrial and mining enterprises, distribution substations, and transformer stations for electrical equipment protection and control
Urban Power Distribution	Ring network units (RMU) and terminal power supply stations in urban areas
Substation Infrastructure	Dual-radial power supply units and compact/prefabricated substations (box-type substations)

Functional Capabilities of FZ(R)N25-12 Load Break Switch

Function	Description
Load Current Switching	Making and breaking normal load currents (up to 630A)
Closed-Loop Current Switching	Capable of switching closed-loop currents in ring networks
Transformer & Cable Switching	Switching magnetizing currents of no-load transformers (up to 1600kVA) and charging currents of cables (up to 10A)
Short Circuit Protection (Combination Unit)	The FZRN25 model (with fuse) can interrupt any current up to the rated short-circuit current (31.5kA) , making it ideal for protecting transformers
Isolation & Grounding	Integrated earthing switch capable of closing onto a short-circuit current, ensuring safe maintenance