FN7-12/24 DR 12kV 24kV Indoor Load Break Switch (LBS)

分类 High Voltage Disconnect Switch, Earthing Switch, Load Break Switch

FN7-12/24 DR indoor load break switch is designed for medium-voltage distribution systems up to 24kV.

It features compact structure, reliable load switching performance, optional fuse protection, and safe operation for switchgear and transformer applications.

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Product Details:

The FN7-12/24 DR Indoor Load Break Switch (LBS) is a medium-voltage indoor switching device designed for 12kV and 24kV power distribution systems.

It is widely used in switchgear panels, RMU systems, substations, industrial plants, and transformer protection applications. The “DR” type generally refers to a load break switch combined with fuse protection.

Key Features

Rated voltage: 12kV / 24kV
Rated current: 400A / 630A
Frequency: 50/60Hz
Indoor installation type
Compact structure for switchgear cabinets
Reliable arc-extinguishing performance
Fuse combination available for transformer protection
Optional earthing switch
Mechanical interlock system for safety
IEC standard compliant (IEC 62271-105)

Main Applications

Medium voltage distribution panels
Ring Main Units (RMU)
Transformer feeder protection
Industrial substations
Commercial building power systems
Renewable energy distribution systems

Technical Specifications

Item	FN7-12DR	FN7-24DR
Rated Voltage	12kV	24kV
Rated Current	400A / 630A	630A
Rated Frequency	50/60Hz	50/60Hz
Short-Circuit Making Current	31.5kA / 50kA	50kA
Short-Time Withstand Current	20kA	25kA
Lightning Impulse Withstand Voltage	75/85kV	125/145kV
Fuse Combination Breaking Capacity	1600A	900A
Mechanical Life	2000 operations	2000 operations

Model Meaning

Typical model examples:

FN7-12DR/400-31.5
FN7-12DR/630-20
FN7-24DR/630

Meaning:

FN7 = Indoor AC high-voltage load break switch
12 / 24 = Rated voltage
D = Earthing switch
R = Fuse combination
400 / 630 = Rated current
20 / 31.5 = Short-time withstand current (kA)

Product Advantages

Compact and Reliable

Suitable for compact switchgear designs and medium-voltage cabinets.

Fuse Protection Combination

The DR version works with current-limiting fuses to protect transformers against overload and short-circuit faults.

High Safety Performance

Interlocking structure prevents incorrect operation and improves operator safety.

Long Service Life

Mechanical endurance typically reaches 2000 operations.

Outline&Drawing

1. Arc Extinguishing Knife 2. Arc Contact Part and Arc Extinguishing Chamber 3. Insulator 4. Base

5. Dynamic Contact Knife 6. Static Contact Knife 7. Spring energy storage device (inside the main axis sleeve) 8. Main knife turning arm

Drawing 1 FN7-12 load switch outline and installation size

1.Main axis 2.Insulating rod 3.Blade 4.Contact 5.Arc contact
6.Arc extinguish chamber 7.Spring stored energy mechanism
8.On/Off operating arm