FLN36-40.5D SF6 Load Break Switch-Indoor Solution for Safe 36/40.5kV Distribution

FLN36-40.5D is an indoor high-voltage SF₆ load switch (or load switch-fuse combination) designed for 36/40.5kV power systems. It can be used as a standalone load switch or combined with a fuse for short-circuit protection.

1. Technical Specifications

2. Operating Environment

• Ambient Temperature: -25°C to +40°C (daily average ≤25°C)

• Altitude: ≤1000m (higher altitudes customizable via technical consultation)

• Relative Humidity: Daily average ≤95%; Monthly average ≤90%

• Vibration Resistance: No frequent violent vibration

3. Key Application Notes

• Standalone Load Switch (FLN36-40.5D/T630-16):
  Used for switching load current, closed-loop current, no-load transformer, and cable charging current. Ideal for RMUs and prefabricated substations in industrial power distribution.

• Load Switch-Fuse Combination (FLN36-40.5D/125-31.5):
  Combines load switching with fuse-based short-circuit protection. Recommended for transformer protection and terminal power supply stations.

4. Product Features

• Multifunctional Integration: Combines load switching, isolation, and grounding in one sealed SF₆-filled enclosure.

• High Reliability: Equipped with natural interlocking to prevent misoperation; safety diaphragm with backward pressure relief.

• Maintenance-Free Design: SF₆ insulation allows long-term stable operation.

• Flexible Operation Modes: Supports manual and electric operation; optional shunt trip coil, overcurrent release, auxiliary switch, and pressure gauge.

• Wide Application: Suitable for industrial, commercial, and residential power distribution systems.

5. Maintenance Guidelines

• Conduct annual inspections of mechanical and electrical components.

• Check SF₆ gas pressure regularly; refill if below threshold.

• Inspect contacts, springs, and seals for wear and replace if necessary.

• Ensure enclosure integrity; no visible damage or leakage.

• Operate the switch according to the manual to avoid misoperation.

6. Frequently Asked Questions (FAQ)

Q1: What is the service life of the SF₆ gas?
A1: Typically 20 years under normal conditions. Refill when pressure drops below the threshold.

Q2: Can FLN36-40.5D be used outdoors?
A2: No. Designed for indoor use. For outdoor applications, use the FLW series.

Q3: Is special training required?
A3: Basic electrical training recommended. Follow the interlocking and operation sequence in the manual.

Q4: What optional accessories are available?
A4: Shunt trip coil, overcurrent release, auxiliary switch, pressure gauge — for remote control and monitoring.

Q5: How is this different from a circuit breaker?
A5: Load switches cannot interrupt short-circuit currents; breakers can. Use FLN36-40.5D for load switching, isolation, and grounding.

Q6: What after-sales support is provided?
A6: 12-month warranty after installation (or 18 months after shipment). Technical support, spare parts, and on-site commissioning are available.

Q7: How to maintain the switch?
A7: Perform regular visual inspections, gas checks, and mechanical inspections to ensure long-term reliability.

Q8: Can it be used in RMUs or compact substations?
A8: Yes. Suitable for indoor RMUs, prefabricated substations, and industrial power distribution.

Q9: What are common failure modes?
A9: Gas leaks, contact wear, and mechanical faults. Early detection via pressure monitoring and inspection is recommended.

Q10: Are spare parts available?
A10: Yes. Provide model and serial number to order contacts, springs, and other wear parts.