 |
The RH-A series outdoor porcelain type disconnect switch is a distribution-grade isolation device designed for 15kV, 27kV and 38kV power distribution systems, with rated current ranging from 200A to 630A. It is engineered for circuit switching operations under no-load voltage conditions, supporting safe isolation for equipment maintenance and adjustment in outdoor power facilities. This model fits standard distribution network designs and supports flexible configuration based on system voltage and current requirements.
In electrical distribution and substation systems, a disconnect switch (also called an isolator switch) ensures a circuit is fully de-energized before service or maintenance work begins. This porcelain type model uses porcelain insulators as the core insulating structure, which maintains stable dielectric performance in outdoor environments with varying temperature and humidity conditions.
This device is not intended for regular circuit control, but for safety isolation of electrical apparatus. Unlike load switches and circuit breakers, disconnect switches do not include arc suppression mechanisms. As off-load devices with low breaking capacity, they must be opened only after the circuit current has been interrupted by other dedicated control devices such as circuit breakers.
The RH-A series disconnect switches support both manual and motor-operated actuation to fit different site operation needs. They can be paired with earthing switches to ground the isolated circuit section, which creates a safe working state for on-site personnel and prevents accidental energization of the circuit under maintenance. These switches are widely deployed in scenarios where driving power must be fully removed for equipment adjustment, repair or retrofit work.
Kv | Amperes | (kA/Is) | Dimensions | |||||
Nominal voltage | Maximum voltage | BIL | Nominal Current | Transient Current | A | B | C | D |
(mm) | (mm) | (mm) | (mm) | |||||
13.8 | 15 | 95 | 200/630 | 16 | 305 | 270 | 580 | 186 |
13.8 | 15 | 95 | 630 | 25 | 305 | 313 | 595 | 230 |
13.8 | 15 | 110 | 200/630 | 16 | 381 | 270 | 650 | 186 |
13.8 | 15 | 110 | 630 | 25 | 381 | 313 | 670 | 230 |
24.2 | 27 | 125 | 200/630 | 16 | 381 | 310 | 650 | 228 |
24.2 | 27 | 125 | 630 | 25 | 381 | 340 | 670 | 260 |
34.5 | 38 | 150 | 630 | 25 | 381 | 368 | 670 | 290 |
34.5 | 38 | 170 | 630 | 25 | 381 | 400 | 670 | 316 |
High-voltage isolation switches serve as core safety devices in electrical substations and distribution networks. This porcelain type outdoor model is built for permanent installation in outdoor power distribution systems across 15kV to 38kV voltage classes.
Common application scenarios include isolation of circuit breakers, power transformers, and overhead transmission lines for scheduled maintenance, fault repair or equipment replacement. They are suitable for use in public utility distribution networks, industrial plant internal power systems, commercial facility distribution stations, and outdoor pole-mounted distribution setups.
For utility operators and facility management teams, these switches create a visible isolation point that confirms a de-energized state for maintenance crews. They allow targeted de-energization of specific equipment sections without shutting down entire distribution networks, which helps reduce overall maintenance downtime. With porcelain insulator construction, the switches adapt to conventional outdoor ambient conditions and align with standard distribution system design requirements for equipment isolation.
Standardized operation is critical to ensure on-site personnel safety and long-term equipment integrity. As off-load isolation devices, these disconnect switches follow strict usage rules that must be followed during all operations.
First, the switches must only be operated when the circuit carries no load current. Operators must confirm the circuit has been fully de-energized by upstream circuit breakers or load switches before opening or closing the disconnector. Direct interruption of active load current or fault current with this device may cause arc hazards and permanent equipment damage.
Second, the series supports both manual and motor-operated mechanisms, allowing selection based on site automation requirements. For motor-operated models, control units can be integrated into existing substation automation systems for remote operation. When paired with earthing switches, operators must follow standard interlock procedures to ensure correct operation sequence between the disconnector and earthing switch.
Third, the devices are designed for safety isolation use only, not for frequent switching operations in daily circuit control. Regular visual inspection of insulator condition and contact components is recommended to maintain stable performance over the service life.
The RH-A series covers nominal voltage levels of 13.8kV, 24.2kV and 34.5kV, corresponding to maximum system voltages of 15kV, 27kV and 38kV. Rated current options include 200A and 630A, with short-time transient current withstand capacity of 16kA or 25kA depending on the specific configuration.
No. Disconnect switches do not have built-in arc suppression structures, so they cannot interrupt running load current or system fault current. They are classified as off-load devices and must only be operated after the circuit current has been cut off by other protective switching devices. They serve exclusively for creating a safe isolation point during maintenance work.
The switches offer multiple basic insulation level (BIL) options, including 95kV, 110kV, 125kV, 150kV and 170kV, each matched to corresponding voltage class requirements. Porcelain insulators provide the main dielectric insulation between live components and the grounded mounting structure for outdoor operation.
Yes, this series is specifically designed as outdoor distribution-type disconnect switches. The porcelain insulator structure is engineered for outdoor installation environments, supporting deployment in open-air substations, overhead pole-mounted lines and other outdoor distribution facilities.
