Unwavering in our dedication to customers and delivering cutting-edge innovations,Bepto stands as your steadfast ally on the journey ahead.
NAL FN18-12 Load Break Switch: 12kV 630A medium voltage LBS for RMU, ABB-compatible modular design, 67kA breaking, puffer-type arc extinguishing, snap-action/spring mechanism, compact proven performance.
Advanced NAL FN18-12 Load Break Switch: Premium NAL/NALF series featuring ABB-compatible modular principle design for 12kV 630A three-pole metal-enclosed and pad-mounted switchgear applications (12-40.5kV ratings available), delivering exceptional 67kA short-circuit closing capacity with 31.5kA/1s rated short-time withstand current (25kA/2s, 20kA/3s), utilizing unique puffer-type arc extinguishing system with heavy-duty steel frame and stand-off insulators, featuring snap-action mechanism type K or stored spring energy mechanism type A options, designed with blade-type interrupters with cast hinges and jaw connectors, offering 85kV lightning impulse withstand across isolating distance and 48kV power frequency withstand.
Modular RMU Building Block Ready: NAL FN18-12 incorporates flexible modular configuration with optional fuse bases type F (max 1600A breaking capacity with 200A fuse), earthing switch type E/EB, motor operator, auxiliary switches, shunt trip, mechanical interlocking, providing proven dependable compact solution for ring main units, metal-enclosed switchgear, pad-mounted switchgear, substations requiring advanced interrupting technology with ABB-similar performance and easy assembly.
| Type | A | A1 | A2 | A3 | B | H | H1 | H2 | K | K1 | M | N | N1 | P | R | S | U | V |
| NAL 12-A/K P=150 | 166 | 320 | 362 | 394 | 90 | 422 | 428 | 510 | 310 | 63 | 412 | 122 | 164 | 150 | 375 | 350 | 75 | 33 |
| NAL 12-A/K P=170 | 166 | 320 | 362 | 394 | 90 | 422 | 428 | 510 | 310 | 63 | 452 | 122 | 164 | 170 | 375 | 390 | 75 | 33 |
| NAL 12-A/K P=210 | 166 | 320 | 362 | 394 | 90 | 422 | 428 | 510 | 310 | 63 | 532 | 122 | 164 | 210 | 375 | 470 | 75 | 33 |
| NAL 17.5-A/K P=170 | 225 | 375 | 418 | 511 | 98 | 534 | 577 | 600 | 441 | 87 | 452 | 122 | 164 | 170 | 500 | 395 | 90 | 18 |
| NAL 17.5-A/K P=210 | 225 | 375 | 418 | 511 | 98 | 534 | 577 | 600 | 441 | 87 | 532 | 122 | 164 | 210 | 500 | 475 | 90 | 18 |
| NAL 24-A/K P=235 | 225 | 375 | 418 | 511 | 98 | 534 | 577 | 600 | 441 | 87 | 582 | 186 | 202 | 235 | 500 | 525 | 90 | 18 |
| NAL 24-A/K P=275 | 225 | 375 | 418 | 511 | 98 | 534 | 577 | 600 | 441 | 87 | 662 | 186 | 202 | 275 | 500 | 605 | 90 | 18 |
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*1250 A: dimension A +2 mm |
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| NAL FN18-12 Load Break Switch Specifications | Technical Parameters | Unit |
|---|---|---|
| Model Number | NAL/NALF FN18-12 (FN18-24 available) | – |
| Brand | Bepto Insulation Systems | – |
| Product Type | Medium Voltage Load Break Switch for RMU (ABB-Compatible) | – |
| Design Principle | Modular Principle (Similar to ABB NAL/NALF) | – |
| Rated Voltage | 12 (24/40.5 available) | kV |
| Rated Current | 630 (up to 1250 available) | A |
| Rated Frequency | 50 / 60 | Hz |
| Number of Poles | Three-Pole | – |
| Arc Extinguishing System | Unique Puffer-Type | – |
| Operating Mechanism Options | Snap-Action Type K / Stored Spring Energy Type A | – |
| Frame Type | Heavy-Duty Steel Frame with Stand-Off Insulators | – |
| Interrupter Type | Blade-Type with Cast Hinges and Jaw Connectors | – |
| Rated Short-Circuit Closing Current | 67 (FN18-12) / 50 (FN18-24) | kA |
| Rated Peak Withstand Current (Dynamic Steady Current) | 67 (FN18-12) / 50 (FN18-24) | kA |
| Rated Short-Time Withstand Current (1s) | 31.5 (FN18-12) / 25 (FN18-24) | kA |
| Rated Short-Time Withstand Current (2s) | 25 (FN18-12) / 25 (FN18-24) | kA |
| Rated Short-Time Withstand Current (3s) | 20 (FN18-12) / 16 (FN18-24) | kA |
| Max. Breaking Capacity in Cooperation with Fuse (NALF) | 1600 (FN18-12) / 900 (FN18-24) | A |
| Max. Fuse Current | 200 | A |
| 1 Min Power Frequency Withstand Voltage (to Earth and Between Poles) | 42 (FN18-12) / 65 (FN18-24) | kV |
| 1 Min Power Frequency Withstand Voltage (Across Isolating Distance) | 48 (FN18-12) / 79 (FN18-24) | kV |
| Lightning Impulse Withstand Voltage (to Earth and Between Poles) Peak | 75 (FN18-12) / 125 (FN18-24) | kV |
| Lightning Impulse Withstand Voltage (Across Isolating Distance) Peak | 85 (FN18-12) / 145 (FN18-24) | kV |
| Ambient Temperature Range | -15°C to +40°C (Maximum 24h average +35°C) | – |
| Maximum Altitude | ≤1000 | m |
| Relative Humidity | Daily ≤95%, Average ≤90% | – |
| Optional Accessories | Motor Operator, Auxiliary Switches, Shunt Trip, Fuse Bases Type F, Earthing Switch Type E/EB, Mechanical Interlocking | – |
| Application | RMU, Metal-Enclosed Switchgear, Pad-Mounted Switchgear, Substations | – |
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.
