Ring Main Unit (RMU)

Electrical Overhead Corporation is a trusted provider of high-quality Ring Main Units (RMU) in Ahmedabad, Gujarat, India. We supply robust and reliable RMU systems designed for efficient power distribution and network protection.


Ring Main Units are compact, sealed switchgear systems used in medium-voltage distribution networks. They ensure uninterrupted power supply and allow safe isolation of faults. Depending on application requirements, RMUs can be designed with different insulation types such as air, oil, or gas.


These units are equipped with advanced switching and protection mechanisms, including fusible switches or circuit breakers (vacuum or gas-insulated), along with protective relays to automatically operate during fault conditions.


Ring Main Units Key Features

  • Compact and space-saving design
  • Available in air-insulated, oil-insulated, and gas-insulated variants
  • High reliability and operational safety
  • Maintenance-free or low-maintenance operation
  • Equipped with vacuum or gas circuit breakers
  • Quick fault isolation with integrated protection system
  • Long service life with durable construction
  • Suitable for indoor and outdoor installations

Applications of RMU

  • Medium-voltage power distribution networks
  • Industrial plants and manufacturing units
  • Commercial complexes and residential townships
  • Utility substations and power grids
  • Renewable energy distribution systems
  • Infrastructure projects and urban power supply systems

Ring Main Unit (RMU) Technical Specifications

  • Voltage Range: Up to 36 kV
  • Rated Frequency: 50/60 Hz
  • Insulation Type: Air / Oil / Gas (SF6)
  • Switch Type:
    • Fusible Switch
    • Vacuum Circuit Breaker
    • Gas-Insulated Circuit Breaker
  • Protection System: Protective relays for automatic fault operation
  • Configuration: Modular and compact design
  • Installation Type: Indoor / Outdoor
  • Application: Medium-voltage distribution networks