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FN7-24R Load Break Switch 24kV 630A – Indoor LBS with Fuse Holder 50kA Breaking Capacity IEC62271-105

Description：

FN7-24R Load Break Switch: 24kV 630A indoor LBS with fuse holder, 50kA breaking capacity, IEC62271-105, load/short-circuit breaking, three-phase 50/60Hz, -25°C to +40°C operation.

Applications：

Advanced FN7-12/24DR Load Break Switch Series: Premium FN7-24R indoor high voltage load break switch designed for three-phase power supply systems with rated voltage 12/24kV and AC 50/60Hz, manufactured per IEC62271-105 standard, featuring integrated fuse holder for switching on/off load-breaking current and short-circuit current, delivering 630A rated current with 50kA rated short-circuit closing current and peak withstand current, capable of 25kA rated short-time withstand current (1s/2s) and 16kA (3s), providing maximum breaking capacity 900A in cooperation with fuse (200A max fuse current), designed for -25°C to +40°C ambient temperature operation at altitudes up to 1000m.

Three-Phase Distribution System Ready: FN7-24R incorporates 65kV power frequency withstand voltage (phase to earth/between poles) and 125kV lightning impulse withstand voltage (1.2/50μs), suitable for environments free from inflammables, explosives, corrosives with 95% daily humidity and earthquake intensity 8 degree, providing reliable indoor load break switching solution for three-phase distribution systems, substations, industrial facilities requiring IEC-compliant high-voltage load break switch with fuse holder and proven 50kA breaking performance.

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Specifications

Main Specification
Type Model DS DX L R RA F
Earthing Switch at Input Terminal Earthing Switch at Output Terminal Interlock Device Fuse Impact Release Power Closing Device
No Release FN7-12/24 – – – – – –
FN7-12/24DSL △ – △ – – –
FN7-12/24DXL – △ △ – – –
FN7-12/24R – – – △ – –
FN7-12/24DSLR △   △ △ – –
FN7-12/24DXLR – △ △ △ – –
With Impact Release FN7-12/24RAF – – – – △ △
FN7-12/24DSLRAF △ – △ – △ △
FN712/24DXLRAF – △ △ – – –
Note: (-)without (△)with
Rated Data
Rated Voltage（kV） Max Voltage

（kV）

 Rated Current

（A）

 1min P.F Withstand Voltage

（kV）

 4s Thermal Stable Current

（virtual）（kA）

 Dynamic Stable Current

（peak）（KA）

 Short Circuit Making Current

（kA）

 Rated Breaking Current

（A）

 Rated Transfer Current

（A）
12 12 400 42/48 12.5 31.5 31.5 400 1000
630 42/48 20 50 50 630 1000
20 24 400 50/60 16 40 40 400 1000
630 50/60 20 50 50 630 1000

Features

FN7-24R Load Break Switch Specifications FN7-12 FN7-24R Unit
Model Number FN7-12 FN7-24R –
Brand Bepto Insulation Systems Bepto Insulation Systems –
Product Type Indoor AC High Voltage Load Break Switch with Fuse Holder Indoor AC High Voltage Load Break Switch with Fuse Holder –
Standard Compliance IEC62271-105 IEC62271-105 –
Rated Voltage 12 24 kV
Rated Frequency 50/60 50/60 Hz
Rated Current 630 630 A
Rated Short-Circuit Closing Current 50 50 kA
Rated Peak Withstand Current (Dynamic Steady) 50 50 kA
Rated Short-Time Withstand Current (1s) 31.5 25 kA
Rated Short-Time Withstand Current (2s) 20 25 kA
Rated Short-Time Withstand Current (3s) 18 16 kA
Max Breaking Capacity (with Fuse) 1600 900 A
Max Fuse Current 200 200 A
Power Frequency Withstand Voltage (Phase to Earth) 42 65 kV
Power Frequency Withstand Voltage (Isolating Distance) 48 79 kV
Lightning Impulse Withstand (Phase to Earth) 1.2/50μs 75 125 kV
Lightning Impulse Withstand (Isolating Distance) 85 145 kV
Altitude ≤1000 ≤1000 m
Ambient Temperature -25 to +40 -25 to +40 °C
Relative Humidity (Daily/Monthly Average) 95% / 90% 95% / 90% –
Earthquake Intensity 8 degree 8 degree –
Application Three-Phase Power Systems, Substations, Industrial Facilities Three-Phase Power Systems, Substations, Industrial Facilities –

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Bepto is a leading Chinese company in electrical insulation, focused on developing advanced solutions for future power systems. We support transmission and distribution safety and growth, with long-term partners including State Grid, ABB, Schneider, Siemens, and GE. Our services reach clients in over 22 countries.

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