Product Overview

The RHD Series Dead-Tank SF6 Circuit Breaker is engineered for 'customized high-voltage power system solutions', covering standard voltage grades from RHD-40.5 to RHD-550 and supporting 'non-standard voltage customization' to precisely match your unique grid upgrade or construction needs. As a dead-tank type, its grounded tank isolates high-voltage components, ensuring superior insulation performance and safety—making it the go-to choose for demanding high-voltage scenarios.

About customization

We offer full customization services for voltage classes, including single-phase, two-phase, and three-phase configurations, as well as non-standard voltage/current solutions. Examples of available voltage and current specifications include 1250 A 75 kV, 3200 A 46 kV, 60 kV, 69 kV, and 75 kV (we support customization ranging from 10 kV to 800 kV for voltage and 1250 A to 6300 A for current). Regardless of your power grid's voltage specifications, we tailor the circuit breaker for seamless integration.

All products are fully assembled and tested at our factory before being shipped directly to your site—no disassembly of key components is required. This eliminates the need for on-site high-voltage testing, significantly saving you time and costs.

Key features

 1. Superior Seismic Resistance

Adopting a low-center-of-gravity design, the breaker can withstand an earthquake intensity of up to 9 degrees, ensuring stable performance in seismic-prone areas—consistent with the RHD series’ proven anti-seismic capability.

2. Excellent Arc-Extinguishing Performance & Long Service Life

Leveraging the high arc-extinguishing efficiency of SF6 gas, the breaker achieves a rated short-circuit breaking current of ≥50kA. It boasts an electrical life of more than 20 operations and a mechanical life of up to 10,000 cycles, significantly reducing equipment replacement and maintenance costs.

3. Low SF6 Gas Leakage Rate

The hermetic metal tank structure minimizes SF6 gas leakage, with an annual leakage rate of ≤1%—far below industry averages. This design not only avoids safety hazards from gas leakage but also reduces environmental impact. 

4. Modular Design & Flexible Expansion

It supports on-demand configuration of built-in current transformers (CTs), with up to 15 CTs available for measurement or protection purposes. The standardized module interface allows flexible combination to meet diverse substation design and layout requirements, especially suitable for space-constrained scenarios.

5. Strong Environmental Adaptability

The breaker operates stably in extreme conditions: ambient temperature ranging from -40℃ to +55℃, maximum daily temperature difference of 32K, altitude up to 3,000m, and air pollution level up to Class IV. It also resists wind pressure of 700Pa (equivalent to 34m/s wind speed) and icing thickness of up to 20mm.

6. Comprehensive Safety Protection

Equipped with anti-mis operation interlocking devices, it effectively prevents accidents caused by incorrect operations. Before delivery, the breaker undergoes lightning impulse tests to eliminate insulation discharge risks from production and assembly, ensuring reliable quality.

7. Maintenance-Free Operating Mechanism

It adopts a spring-operated mechanism that is oil-free, gas-free, and maintenance-free. This mechanism delivers stable performance, low noise, and high reliability, reducing long-term operational workload.

Technology Parameters

Application Scenarios

1. Large Hub Substations

Ideal for 220kV+ key hub substations, the customized RHD breaker controls and protects main power circuits. Its non-standard voltage adaptability ensures seamless integration into existing or upgraded grid architecture.

2. New Energy Grid-Connection Systems

Suitable for high-voltage grid connections in wind and solar power bases. Custom voltage ratings ensure reliable integration of renewable energy into the main grid, even in projects with unique voltage requirements.

3. Industrial High-Voltage Power Systems

Perfect for heavy industries (metallurgy, chemicals) with specialized voltage needs. The breaker’s robust performance and customizability guarantee stable power supply for high-power industrial equipment.