The quality 11KV Indoor LBS Air Load Switches manufactured by Wzonpa factory in China, are designed for 12kV medium-voltage distribution systems (10kV–12kV networks).
11KV Indoor LBS Air Load Switches are medium-voltage indoor switchgear device used in 12kV power distribution systems (commonly 11kV networks) to safely control and isolate electrical circuits.
Reliable Current Interruption
Capable of disconnecting working current, overload current, and short-circuit current through coordinated load switch and fuse operation.
Compact Modular Design
Load switch, grounding switch, fuse, and operating mechanism are integrated into a single frame, reducing installation space and simplifying maintenance.
Enhanced Safety Structure
The 11KV Indoor LBS Air Load Switches made in China are equipped with insulated static contact covers and phase-isolated structure to minimize internal arc risks and improve insulation reliability.
High Stability Performance
Direct-acting contact structure ensures strong dynamic and thermal stability under high current conditions.
Mechanical Interlocking System
Built-in interlock between load switch, grounding switch, and fuse complies with “five-prevention” safety requirements.
Flexible Operation Modes
Supports manual operation and electric operation (AC/DC dual power), meeting modern power system remote control requirements.
Protective Valve Design
Unique valve mechanism automatically isolates the contact after opening, enhancing operational protection.
This 11kV indoor LBS switch is designed for stable operation under harsh industrial environments:
Ambient temperature: -25°C to +40°C
Altitude: ≤1000 m
Relative humidity: ≤95% daily / ≤90% monthly
Seismic intensity: ≤8 degree
Pollution level: Class II
Environment: No explosive gas, corrosive chemical, or severe vibration
The 11KV Indoor LBS Air Load Switches is widely used in:
Medium voltage switchgear systems (KYN28, HXGN)
Ring Main Units (RMU) for urban grids
Industrial power distribution substations
Renewable energy collection systems (solar / wind substations)
Transformer primary protection systems
Underground and cable distribution networks
| SN | Item | Unit | FKN12A-12D | FKRN12A-12D | ||
| 1 | Rated voltage | KV | 12 | 12 | ||
| 2 | Rated frequency | Hz | 50 | 50 | ||
| 3 | Rated current | A | 630 | 125 | ||
| 4 | Rated insulation level | 1-minute power frequency withstand voltage | To the ground,phase to phase | KV | 42 | 42 |
| Isolation fracture | 48 | 48 | ||||
| Lightning impulse withstand voltage(peak value) | To the ground,phase to phase | 75 | 75 | |||
| Isolation fracture | 85 | 85 | ||||
| 5 | Load switch | KA | 20 | |||
| Grounding switch | 20 | 20 | ||||
| 6 | Load switch | S | 4 | - | ||
| Grounding switch | 2 | 2 | ||||
| 7 |
Rated short-circuit closing current (peak) |
KA | 50 | - | ||
| 8 | Rated breaking current | Active load breaking current | A | 630 | - | |
| Closed loop breaking current | 630 | |||||
| 5%active load breaking current | 31.5 | |||||
| Cable charging current | 10 | - | ||||
| Disconnect the capacity of the no-load transformer | KVA | 1250 | 1250 | |||
| 9 | Rated short-circuit breaking current(current limiting fuse) | KA | - | 31.5 | ||
| 10 | Rated transfer current | A | - | 1200 | ||
| 11 | Mechanical lifespan | Times | 2000 | 2000 | ||
| 12 | Impactor output energy | J | 1+0.5 | |||
| SN | Item | Unit | Parameters |
| 1 | Fracture distance | ≥175 | |
| 2 | Interphase center distance | 210±2 | |
| 3 | Interphase air gap | mm | ≥125 |
| 4 | Travel | 210±4 | |
| 5 | Overtravel | ≥40 | |
| 6 | Three phase closing at different stages | ≤10 | |
| 7 | Three phase opening at different stages | ms | ≤5 |
| 8 | Inherent opening time of the shunt release | ms | 40~65 |
| 9 | Main circuit resistance | μΩ | ≤130 |
Q1: What is an Indoor LBS Air Load Switch used for?
It is used to switch load currents and isolate circuits in medium-voltage distribution systems (10–12kV), especially in RMU and indoor switchgear.
Q2: What is the difference between FKN12 and FKRN12?
FKN12 is a standard load switch, while FKRN12 includes a fuse combination system for full short-circuit protection.
Q3: Can it be used in Ring Main Units (RMU)?
Yes, it is widely used in RMU systems for urban and rural power distribution networks.
Q4: Can it be motor-operated?
Yes, electric operation (AC/DC motor mechanism) is optional for remote control systems.
Q5: What industries use this load switch?
Utilities, substations, industrial plants, renewable energy systems, and distribution networks.
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No. 58 Binhainan Fourth Road, Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province, China
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