24kV SF₆ Load Break Switch Manufacturer
FLN36-24D/T630-20-230 24kV SF₆ Load Break Switch
Product Introduction
The Changyun Intelligent FLN36-24D/T630-20-230 SF₆ Load Break Switch (LBS) is a high-performance medium-voltage switching device designed for 24kV, three-phase AC 50Hz distribution systems. Utilizing SF₆ gas as the insulation and arc-extinguishing medium, it provides excellent electrical insulation, reliable load switching performance, and long-term operational stability.
Designed for ring main units (RMUs), compact substations, pad-mounted substations, and industrial power distribution systems, the FLN36-24D series is capable of switching normal load currents, closed-loop currents, transformer magnetizing currents, and cable charging currents. Its compact structure, low maintenance requirements, and high mechanical endurance make it an ideal solution for modern medium-voltage distribution networks.
The switch is equipped with a spring-operated mechanism, pressure gauge, and comprehensive anti-misoperation mechanical interlocking system to ensure safe and reliable operation. Optional motor-operated mechanisms are available for remote operation and distribution automation applications.
Manufactured under a strict quality management system, the FLN36-24D complies with IEC 62271-103:2021, IEC 62271-102:2022, and relevant SPLN03.0201-1.2019 technical specifications, making it suitable for utility, industrial, commercial, and renewable energy projects.
Key Features
Excellent Switching Performance
The FLN36-24D is designed to safely make and break normal load currents, closed-loop currents, transformer no-load currents, and cable charging currents, ensuring reliable operation in medium-voltage distribution networks.
High Reliability
The sealed SF₆ gas chamber provides outstanding insulation and arc-extinguishing capability while maintaining stable performance throughout the product's service life.
Compact Design
Its compact structure allows easy installation in Ring Main Units (RMUs), compact substations, prefabricated substations, and other space-constrained applications.
Comprehensive Safety Protection
The switch incorporates a complete anti-misoperation mechanical interlocking system that enhances operator safety and prevents incorrect switching operations.
Optional Motor Operation
Motor-operated mechanisms can be supplied to support remote operation, SCADA systems, and distribution automation projects.
Low Maintenance
The sealed gas tank minimizes maintenance requirements while providing long-term operational reliability and low lifecycle costs.
Product Benefits
Choosing the Changyun Intelligent FLN36-24D Load Break Switch provides several advantages:
- Reliable medium-voltage load switching
- Excellent insulation performance
- Long mechanical service life
- Compact and lightweight construction
- Easy integration into RMUs
- Maintenance-free sealed gas tank
- Improved operational safety
- Flexible manual or motor-operated control
- Suitable for smart distribution systems
- Lower operating costs over the equipment lifecycle
Working Principle
The FLN36-24D Load Break Switch uses SF₆ gas as both the insulation and arc-extinguishing medium. During switching operations, the contacts open and close inside the sealed gas chamber, where the SF₆ gas rapidly extinguishes the electrical arc and restores insulation between the contacts.
The switch is capable of safely interrupting normal load currents, transformer magnetizing currents, and cable charging currents without damaging the contacts. When integrated into a Ring Main Unit, it enables reliable sectionalizing and load transfer while ensuring continuous power supply within the distribution network.
Optional motor-operated mechanisms allow remote switching and seamless integration into modern distribution automation systems.
Typical Applications
The FLN36-24D SF₆ Load Break Switch is widely used in:
- Ring Main Units (RMUs)
- Compact substations
- Pad-mounted substations
- Utility distribution networks
- Industrial power distribution systems
- Commercial buildings
- Renewable energy projects
- Solar photovoltaic power stations
- Wind farms
- Mining operations
- Airports
- Railway infrastructure
- Smart grid projects
- Urban distribution networks
Service Conditions
The FLN36-24D Load Break Switch is designed for reliable operation under the following conditions:
- Altitude: Up to 1000 m
- Maximum ambient temperature: +40°C
- 24-hour average temperature: ≤35°C
- Minimum ambient temperature: –25°C
- Daily average relative humidity: ≤95%
- Monthly average relative humidity: ≤90%
- Suitable for environments free from excessive dust, corrosive gases, flammable gases, salt spray, and severe vibration.
Standards & Compliance
The FLN36-24D is designed and manufactured in accordance with internationally recognized standards, including:
- IEC 62271-103:2021
- IEC 62271-102:2022
- SPLN03.0201-1.2019 (Applicable Requirements)
Each unit undergoes comprehensive factory testing before shipment to ensure consistent quality, electrical performance, and operational reliability.
Technical Specifications
| NO. | Item Name | Unit | Parameter | |
|---|---|---|---|---|
| 1 | Rated Voltage | kV | 24 | |
| 2 | Rated Current | A | 630 | |
| 3 | Rated Frequency | Hz | 50 | |
| 4 | 1min Power Frequency Withstand Voltage | kV | Phase-to-phase, Phase-to-ground, Switch Break: 50 / Isolation Break: 60 | |
| 5 | Lightning Impulse Withstand Voltage | kV | Phase-to-phase, Phase-to-ground, Switch Break: 125 / Isolation Break: 145 | |
| 6 | Rated Short-time Power Frequency Withstand Voltage of Auxiliary and Control Circuits | kV | 2 | |
| 7 | Rated Active Load Breaking Current | A | 630 | |
| 8 | Rated Closed-loop Making and Breaking Current | A | 630 | |
| 9 | Rated Cable Charging Breaking Current | A | 16 | |
| 10 | Rated Short-circuit Making Current | kA | 50 | |
| 11 | Rated Short-time Withstand Current and Duration | kA/s | 20-1 | |
| 12 | Mechanical Endurance | Times | SF₆ Load Switch / Earthing Switch 5000/2000 | |
| 13 | Circuit Resistance | μΩ | ≤65 | |
| 14 | Rated SF₆ Gas Pressure (at 20℃) | kPa | 40～60 (see specific product requirements) | |
| 15 | Minimum Functional Pressure (at 20℃) | kPa | 20 | |
| 16 | Rated Voltage of Motor | V | DC 48 | |
| 17 | Annual Leakage Rate of Gas Tank Sealing Test | ≤0.025% | ||
| 18 | SF₆ Gas Moisture Measurement Test (at 20℃) | μL/L | ≤200 | |
| 19 | Partial Discharge (1.1Ur) | pC | ≤20 | |
| No. | Item Name | Unit | Parameter | |
|---|---|---|---|---|
| 1 | Center Distance Between Poles | mm | 230±1 | |
| 2 | Three-phase Opening and Closing Asynchronism | ms | ≤5 | |
| 3 | Average Opening Speed (6ms after Opening) | m/s | >3.2 | |
| 4 | Average Closing Speed (6ms before Closing) | m/s | >3.2 | |
| 5 | Opening Time | ms | 20-70 | |
| 6 | Maximum Torque for Manual Operation | N.m | 160 | |
| No. | Item Name | Unit | Parameter | |
|---|---|---|---|---|
| 1 | Rated Voltage | V | DC 48 | |
| 2 | Rated Closing Energy Storage Operation Time | S | ≤10 | |
| 3 | Motor Power | W | 60 | |
| 4 | Opening Coil Resistance | Ω | 6 | |
Frequently Asked Questions
What is an SF₆ Load Break Switch?
An SF₆ Load Break Switch is a medium-voltage switching device designed to make and break normal load currents. It uses SF₆ gas as the insulation and arc-extinguishing medium, providing reliable switching performance, compact dimensions, and long service life for power distribution systems.
What is the difference between a Load Break Switch and a Circuit Breaker?
A Load Break Switch is designed for switching normal load currents and isolating circuits during maintenance, while a Circuit Breaker can interrupt both normal load currents and fault currents. In many Ring Main Units, both devices are used together to provide complete protection and operational flexibility.
Can the FLN36-24D be installed in Ring Main Units?
Yes. The FLN36-24D is specifically designed for integration into Ring Main Units (RMUs), compact substations, and pad-mounted substations, providing reliable load switching and distribution network control.
Do you provide OEM and customized solutions?
Yes. Changyun Intelligent offers OEM and ODM services, including customized operating mechanisms, motor voltages, panel configurations, branding, nameplates, packaging, and technical documentation according to customer requirements.
What is the delivery time?
The standard production lead time is generally 20–35 days, depending on the order quantity and customization requirements.
Do you provide technical support?
Yes. We provide technical consultation, product selection assistance, installation guidance, operation manuals, troubleshooting support, and after-sales service to help customers achieve reliable long-term operation.
Why Choose Changyun Intelligent?
- 17+ Years of Manufacturing Experience
- Professional Medium-Voltage Switchgear Manufacturer
- Factory-Direct Pricing
- OEM & ODM Services
- IEC-Compliant Products
- Strict Quality Control
- Reliable Export Experience
- Fast Delivery
- Professional Technical Support
- Long-Term Partnership
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