Unwavering in our dedication to customers and delivering cutting-edge innovations,Bepto stands as your steadfast ally on the journey ahead.
NALF FN18-24 Load Break Switch: 24kV 630A ABB compatible LBS, 50kA withstand, 900A fuse breaking, puffer arc extinguishing, modular design, metal-enclosed/pad-mounted, -15°C to +40°C.
Advanced NALF/FN18-24 Modular Load Break Switch Series: Premium FN18-24D three-pole general purpose load break switch offering switchgear owners and assemblers advanced interrupting technology and proven dependable performance in compact design, based on ABB NAL/NALF modular principle with frame insulators and current-carrying parts, featuring unique puffer-type arc extinguishing system, heavy-duty steel frame with stand-off insulators, blade-type interrupters with cast hinges and jaw connectors, delivering 630A rated current with 50kA rated short-circuit closing and peak withstand current (dynamic steady), 25kA (1s/2s) and 16kA (3s) short-time withstand (thermally stable), providing 900A maximum breaking capacity with fuse cooperation and 200A maximum fuse current.
Metal-Enclosed Switchgear Ready: NALF FN18-24 incorporates snap-action mechanism type K or stored spring energy mechanism type A, optional fuse bases type F with tripping mechanism, earthing switch type E/EB for direct/free-standing mounting, 65kV power frequency withstand (ground/phase), 125kV lightning impulse, suitable for -15°C to +40°C environments at altitudes ≤1000m, providing reliable modular load break switching solution for 12-40.5kV metal-enclosed and pad-mounted switchgear applications requiring ABB-compatible advanced interrupting technology.
| NALF FN18-24 Load Break Switch Specifications | FN18-12 | FN18-24 | Unit |
|---|---|---|---|
| Model Number | FN18/NAL/NALF-12 | FN18/NAL/NALF-24 | – |
| Brand | Bepto Insulation Systems | Bepto Insulation Systems | – |
| Product Type | ABB Compatible Modular Load Break Switch | ABB Compatible Modular Load Break Switch | – |
| Design Principle | Modular Principle (Based on ABB NAL/NALF) | Modular Principle (Based on ABB NAL/NALF) | – |
| Pole Configuration | Three-Pole | Three-Pole | – |
| Rated Voltage | 12 | 24 | kV |
| Rated Frequency | 50/60 | 50/60 | Hz |
| Rated Current | 630 | 630 | A |
| Rated Short-Circuit Closing Current | 67 | 50 | kA |
| Rated Peak Withstand Current (Dynamic Steady) | 67 | 50 | kA |
| Rated Short-Time Withstand Current (1s) | 31.5 | 25 | kA |
| Rated Short-Time Withstand Current (2s) | 25 | 25 | kA |
| Rated Short-Time Withstand Current (3s) | 20 | 16 | kA |
| Max Breaking Capacity (with Fuse Cooperation) | 1600 | 900 | A |
| Max Fuse Current | 200 | 200 | A |
| 1min Power Frequency Withstand (Ground/Phase) | 42 | 65 | kV |
| Power Frequency Withstand (Isolating Distance) | 48 | 79 | kV |
| Lightning Impulse Withstand (Ground/Phase) 1.2/50μs | 75 | 125 | kV |
| Lightning Impulse Withstand (Isolating Distance) | 85 | 145 | kV |
| Arc Extinguishing System | Unique Puffer-Type | Unique Puffer-Type | – |
| Frame Structure | Heavy-Duty Steel Frame with Stand-Off Insulators | Heavy-Duty Steel Frame with Stand-Off Insulators | – |
| Interrupters | Blade-Type with Cast Hinges and Jaw Connectors | Blade-Type with Cast Hinges and Jaw Connectors | – |
| Operating Mechanism Options | Snap-Action Type K / Stored Spring Energy Type A | Snap-Action Type K / Stored Spring Energy Type A | – |
| Fuse Bases | Type F (with/without Fuse Tripping Mechanism) | Type F (with/without Fuse Tripping Mechanism) | – |
| Earthing Switch | Type E/EB (Direct Mounting / Free Standing) | Type E/EB (Direct Mounting / Free Standing) | – |
| Optional Accessories | Operating Handles, Motor Operator, Auxiliary Switches, Shunt Trip, Mechanical Interlocking | Operating Handles, Motor Operator, Auxiliary Switches, Shunt Trip, Mechanical Interlocking | – |
| Ambient Temperature | -15 to +40 (24h avg ≤+35) | -15 to +40 (24h avg ≤+35) | °C |
| Relative Humidity (Daily/Monthly Average) | ≤95% / ≤90% | ≤95% / ≤90% | – |
| Altitude | ≤1000 | ≤1000 | m |
| Application | Metal-Enclosed Switchgear, Pad-Mounted Switchgear (12-40.5kV) | Metal-Enclosed Switchgear, Pad-Mounted Switchgear (12-40.5kV) | – |
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.
Bepto focuses on the global market and provides our clients with products suitable for the local market:
Unwavering in our dedication to customers and delivering cutting-edge innovations,Bepto stands as your steadfast ally on the journey ahead.
