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FN5-24 Load Break Switch 24kV 630A – Indoor MV LBS Fuse Combination Air RMU 50kA Closing 1250kVA

Description：

FN5-24 Load Break Switch: 24kV 630A indoor MV LBS with fuse combination, air RMU, 50kA closing, 31.5kA peak withstand, 1250kVA transformer, multiple breaking, -25°C to +40°C.

Applications：

Advanced FN5-24 Load Break Switch-Fuse Combination: Premium FN5-24 indoor high voltage load switch and fuse combination electrical appliance designed for AC 50Hz 24kV power distribution networks, providing breaking load current and closing short-circuit current capabilities for air RMU applications, featuring load switch with fuse cutting off short-circuit current for protection switching purposes, delivering 630A rated current with 50kA rated short-circuit closing current and 50kA rated peak withstand current (dynamic steady), capable of 20kA (2s) rated short-time withstand current (thermally stable), 630A rated closed-loop and active load breaking current, 10A rated cable charging breaking and 1250kVA rated no-load transformer breaking capacity.

Air RMU Distribution Ready: FN5-24 incorporates multiple load current breaking times—20 times (100% load), 35 times (60% load), 75 times (30% load), 80 times (5% load)—featuring 65kV power frequency withstand voltage (ground/phase), 79kV isolation gap withstand, 125kV lightning impulse (ground/phase) and 145kV isolation fracture impulse, suitable for -25°C to +40°C environments at altitudes ≤1000m, providing reliable indoor medium voltage load break switching solution for 24kV air RMU distribution networks requiring fuse combination protection.

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Features

FN5-24 Load Break Switch Specifications 400A Model 630A Model Unit
Model Number FN5-24/400 FN5-24/630 –
Brand Bepto Insulation Systems Bepto Insulation Systems –
Product Type Indoor High Voltage Load Switch and Fuse Combination Electrical Appliance Indoor High Voltage Load Switch and Fuse Combination Electrical Appliance –
Application Air RMU (Ring Main Unit) Air RMU (Ring Main Unit) –
Rated Voltage 24 24 kV
Rated Frequency 50 50 Hz
Rated Current 400 630 A
Rated Short-Time Withstand Current (Thermally Stable) 12.5 (4s) 20 (2s) kA
Rated Peak Withstand Current (Dynamic Steady) 31.5 50 kA
Rated Closed-Loop Breaking Current 400 630 A
Rated Active Load Breaking Current 400 630 A
5% Rated Active Load Breaking Current 20 31.5 A
Rated Cable Charging Breaking Current 10 10 A
Rated Breaking No-Load Transformer Capacity – 1250 kVA
Rated Short-Circuit Closing Current 31.5 50 kA
Load Current Breaking Times 20 (100% Load), 35 (60% Load), 75 (30% Load), 80 (5% Load) 20 (100% Load), 35 (60% Load), 75 (30% Load), 80 (5% Load) Times
1min Power Frequency Withstand Voltage (Ground/Phase) 65 65 kV
Power Frequency Withstand Voltage (Isolation Gaps) 79 79 kV
Lightning Impulse Withstand Voltage (Ground/Phase) 125 125 kV
Lightning Impulse Withstand Voltage (Isolation Fracture) 145 145 kV
Opening/Closing Operation Torque (Force) 90 N·m (180 N) 100 N·m (200 N) N·m (N)
Ambient Temperature -25 to +40 (Electric: -5 to +40) -25 to +40 (Electric: -5 to +40) °C
Altitude ≤1000 ≤1000 m
Relative Humidity (Daily/Monthly Average) ≤95% / ≤90% (+25°C) ≤95% / ≤90% (+25°C) –
Environment Free from Corrosive/Flammable Gas, Water Vapor, Severe Vibration Free from Corrosive/Flammable Gas, Water Vapor, Severe Vibration –
Application 24kV Power Distribution Networks, Air RMU 24kV Power Distribution Networks, Air RMU –

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