ODM FZN25-12 Indoor AC High-Voltage Vacuum Load Switch Supplier, Manufacturer

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ODM FZN25-12 Indoor AC High-Voltage Vacuum Load Switch Supplier, Manufacturer

The FZN25-12 indoor AC high-voltage vacuum load switch is designed for 12kV, 50Hz three-phase networks, capable of switching load currents and closing short-circuit currents. Rated at 630A with 20/25kA short-time withstand capacity, it features reliable vacuum arc-extinguishing technology. This load switch supports both manual and motorized operation, making it ideal for harsh environments requiring long maintenance intervals and frequent operation. Compliant with GB/T and IEC standards, it provides stable performance in temperatures from -25℃ to +40℃ and altitudes up to 2000m.

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Product Description

Type & Meaning

F	Load Break Switch
Z	Vacuum
N	Indoor
25	Design Serial Number
12	Rated Voltage (kV)
D	Earthing Switch (Optional)
T	Spring Operating Mechanism
630	Rated Current (A)
20	Rated Short-time Withstand Current (kA)

Basic Structure

The FZN25-12 is a frame-assembled load break switch. Moving/fixed contacts in each phase are enclosed in a vacuum interrupter, mounted with conductors on an integral insulator. The interrupter connects to a rear vertical disconnector via conductors. The disconnector is housed in a semi-enclosed insulator fixed to the metal frame. A side-mounted spring operating mechanism extends service life. A removable fuse assembly forms a switch-fuse combination. The frame includes an earthing arm, mechanism, and interlocks. A transparent flame-retardant shield ensures safety, and a bottom earthing contact enables integrated earthing switch versions.

Uses vacuum interrupter for strong arc extinction, reliable and safe performance.
Integrated load break switch, disconnector, and mechanism for simple one-step operation with visible break; optional earthing switch with interlock.
Supports manual/motorized operation with reliable interlocks, simplifying switchgear design.
Fully insulated design (SMC supports) with conical insulators and transparent shield, ideal for armored switchgear.
Flexible installation (front/side mount), easy maintenance and fuse replacement.

1 Upper contact base of disconnector

2 Insulating support frame

3 Transparent glass shield

4 Metal frame

5 Conductive tube of disconnector

6 Lower contact base of disconnector

7 Vacuum interrupter

8 Lower outlet base of vacuum interrupter

9 Drive unit of vacuum load break switch

10 Fuse

11 Tripping unit

12 Earthing switch

13 Operation hole for earthing switch

14 Cabinet door lock pin

15 Manual trip button

16 Operation hole for charging & closing

Product Display

Technical Parameters

1. Main Electrical Technical Parameters

Parameters		Unit	Model
Parameters		Unit	FZN25-12D/T630	FZRN25-12D/T200
Rated Voltage		kV	12	12
Rated Frequency		Hz	50	50
Rated Current		A	630	200
Rated Breaking Current	Active Load Current	A	630	-
	Closed-loop Current	A	630	-
	No-load Transformer Capacity	kVA	1600	-
	Cable Charging Current	A	10	-
Rated Transfer Current		A	-	1700
Rated Short-time Withstand Current (4s)		kA	20(25)	-
Rated Peak Withstand Current		kA	50(63)	-
Rated Short-circuit Breaking Current		kA	-	31.5
Rated Short-circuit Making Current		kA	50(63)	-
Rated Short-time (1min) Power Frequency Withstand Voltage		kV	42/48
Rated Lightning Impulse Withstand Voltage (Peak)		kV	75/85

Notes:
1) The rated short-circuit duration for the earthing switch is 2 seconds.
2) The 1min power frequency withstand voltage across the interrupter break is 35kV.

2. Main Mechanical Characteristic Parameters

Parameters	Unit	Value	Note
Vacuum interrupter contact gap	mm	6+(1to 0)	-
Vacuum interrupter contact stroke	mm	-2+(1 to 0)	Measured contact spring compression stroke
Disconnector break gap	mm	≥130	-
Phase-to-phase center distance	mm	210±1	-
3-pole closing non-synchronism of vacuum interrupter	ms	≤3	-
Allowable contact closing bounce time of vacuum interrupter	ms	≤3	-
Average closing speed of vacuum interrupter	m/s	0.6±0.2	-
Average opening speed of vacuum interrupter	m/s	0.9±0.2	-
Conductive loop resistance per pole	μΩ	≤180	-
Maximum operating torque for manual operation	Nm	≤160	-
Mechanical life	times	10000	-

3. Motor Technical Parameters

Rated Voltage	Rated Output Power	Normal Operating Voltage Range
≈220V	70W	85%-100% of rated voltage

4. Shunt Trip Unit Parameters

Rated Voltage	Normal Operating Voltage Range
DC 220V / DC 110V	80%-120% of rated voltage

5. Current-Limiting Fuse Selection Reference

For the current-limiting fuse in the load break switch-fuse combination unit, the rated current of the fuse link shall be selected according to the transformer capacity. The reference parameters for selection are as follows:

Transformer Capacity (kVA)	100	125	160	200	250	315	400	500	630	750/800	1000	1250	1600	2000
Fuse Rated Current (A)	10	12.5	16	20	25	31.5	40	50	63	80	100	125	160	200

Outline and Installation Dimensions

Frequently Asked Questions

What is the primary function of the FZN25-12 vacuum load break switch?

The FZN25-12 is designed for medium-voltage indoor power distribution systems. It is primarily used to close, carry, and break load currents, closed-loop currents, no-load transformer charging currents, and cable charging currents.

What are the main differences between the FZN25-12D and FZRN25-12D models?

The FZN25-12D is a basic vacuum load break switch unit, whereas the FZRN25-12D includes an integrated current-limiting fuse assembly to provide short-circuit breaking capability up to 31.5 kA for transformer protection.

How does the integrated visible break enhance operational safety?

The combination of a vacuum interrupter with a series-connected disconnector creates an overt, visible air gap isolation break, ensuring clear confirmation of circuit disconnection before maintenance.

What operating mechanisms are supported by this series?

The switch supports both manual spring operating mechanisms and motorized mechanisms (typically AC/DC 220V), equipped with robust interlocks to prevent mal-operation in switchgear cabinets.

What is the mechanical operating life of the switch?

The FZN25-12 offers a durable mechanical endurance rated for up to 10,000 operations under specified standard conditions.

How is the fuse size selected for transformer protection?

The fuse rated current corresponds directly to the transformer's kVA rating, ranging from 10A for a 100 kVA transformer up to 200A for a 2000 kVA transformer, according to the selection table provided.

ODM FZN25-12 Indoor AC High-Voltage Vacuum Load Switch Supplier, Manufacturer

Product Description

Type & Meaning

Basic Structure

Product Display

Technical Parameters

Outline and Installation Dimensions

Frequently Asked Questions

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