12kV Pneumatic Load Break Switch-Fuse Combination

Designed by Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd., the 12kV Pneumatic Load Break Switch-Fuse Combination combines a load break switch, high-voltage fuse, and pneumatic operating mechanism in one unit. It is available in FZN25-12D/T630-20 (630A) and FZRN25-12D/T125-31.5 (125A, 31.5kA fuse protection) configurations. The pneumatic mechanism uses compressed air to drive switching, making the unit suitable for remote control, frequent operation, or installation sites without stable control power.

Pneumatic Operation Advantages

• No control power dependency: operates normally without DC power or with unstable power.
• Remote and centralized control: pneumatic piping allows operation from a safe distance.
• Fast and stable action: large output force and fast switching for frequent operations and harsh environments.

The 12kV Pneumatic Load Break Switch-Fuse Combination is designed for these scenarios.

Technical Specifications

Pneumatic Parameter Confirmation Checklist

• Working air pressure range (e.g., 0.5-0.7MPa)
• Air consumption per switching operation
• Cylinder specifications and pneumatic connection dimensions
• Operating speed requirements
• Air storage tank requirements, if any
• Control method, such as solenoid valve control voltage

If parameters are not available, technical assistance can be provided for pneumatic system matching.

Configuration Selection Guide

For the 12kV Pneumatic Load Break Switch-Fuse Combination, if transformer capacity is 1250kVA or below with load current within 125A, choose FZRN25 (fuse short-circuit protection). If load current is within 630A and short-circuit level does not exceed 20kA, choose FZN25. Both support 1250kVA no-load transformer breaking.

Customization and Pneumatic Matching

• Provide working air pressure, connection dimensions, control voltage, and operating frequency.
• Technical team provides matching solution within 1 working day, confirming cylinder and solenoid valve configuration.
• Pneumatic mechanism is integrated on the production line.
• Pneumatic operation testing is completed before shipment.
• Operation and maintenance manuals are provided with the shipment.
• Customization for the 12kV Pneumatic Load Break Switch Fuse Combination is supported.

Applications

• Distribution transformer protection (1250kVA and below)
• Industrial distribution lines (630A load lines)
• Outdoor box substations
• Ring main units and medium-voltage switchgear
• Replacement and retrofit projects

After-Sales Service Support

• Pre-sales: product selection and technical consultation; customized solutions according to drawings or specifications; product drawings, test reports, and qualification documents provided.
• During sales: dedicated order tracking; standard products 10-15 days, customized 15-30 days; OEM private labeling; 100% performance inspection before shipment; certificates of conformity provided.
• After sales: installation and maintenance guidance via remote support or on-site assistance; standard warranty; free repair and spare parts replacement for non-human quality issues during warranty; response within 24 hours; spare parts stocked.
• Value-added: one-stop procurement for switchgear and electromagnetic coils; flexible customization for voltage levels, dimensions, and performance parameters.

Usage Notes

• Ensure compressed air supply is clean and dry. Moisture and impurities may damage cylinder and solenoid valve.
• Regularly check seal aging and replace in time.
• Operate within rated electrical parameters and working air pressure range.
• Cut off power supply and air source before maintenance.
• Stop operation immediately if abnormal noise or slow action occurs.
• Periodically perform mechanical operation tests and insulation checks.
• For outdoor installations, protect pneumatic components from rain, dust, and direct sunlight.

FAQ

Q1: What information is needed for a quotation?

A: Provide rated current, short-circuit requirements, fuse model, auxiliary voltage, pneumatic parameters (air pressure, connection, air consumption), application, and quantity for the 12kV Pneumatic Load Break Switch-Fuse Combination.

Q2: What is the MOQ and lead time?

A: Standard products support MOQ 1 unit. Lead time is 7-15 working days for standard products, 15-30 working days for customized configurations.

Q3: What are the advantages of a pneumatic mechanism compared with a spring mechanism?

A: No dependence on control power, suitable for remote control, fast action, large output force. Requires a compressed air system.

Q4: Do you support customization?

A: Yes. Pneumatic parameters, mounting dimensions, auxiliary circuit voltage, and configuration can be adjusted.

Q5: Are you a factory? Do you support factory audits?

A: We are a manufacturer with our own factory in Yueqing, Zhejiang, founded in 2012. Factory audits are supported.

Q6: What tests are done before shipment?

A: Resistance test, mechanical operation test, withstand voltage test, vacuum degree inspection, and pneumatic operation testing.