RING MAIN UNIT (RMU)
Compact, metal-enclosed RMU for safe, reliable MV distribution in urban networks and industrial estates. Factory-assembled bays with sealed interrupters, integrated protection, and remote-control readiness for fast commissioning and minimal downtime.
Standard: IEC 62271 series for metal-enclosed switchgear; internal-arc classified options for enhanced personnel safety.
Use: 11–36 kV ring networks, compact substations, smart grids, renewable evacuation, and campus/estate distribution where footprint and uptime matter.
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Product Description
Swastik’s Ring Main Unit (RMU) is a compact, metal-enclosed MV switchgear assembly engineered for secondary distribution in urban substations, compact kiosks, renewables, and campus networks. Factory-assembled with sealed interrupters, interlocks, and arc-safety options, it delivers high service continuity, fast fault isolation, and seamless integration with numerical protection, metering, and SCADA.
* Voltage class: 11–36 kV; 50 Hz.
* Configurations: 3-way to 5-way lineups; non-extensible or extensible bays for future feeders.
* Safety: internalarc classified enclosure, visible earthing, mechanical/key interlocks, IP-rated construction.
* Construction: Compact metal-clad cabinet with sealed tank technology (SF6 or eco/air options), front access, labeled mimic.
* Control and protection: numerical relays (OCR/EF/SEF), fault passage indicators, motorized operation options, event logs, timestamping.
Technical Specifications
Comprehensive technical details and performance parameters
Ring Main Unit comprises of one incomer feeder and one or more outgoing feeder. The incomer feeder is either Vacuum Circuit Breaker or SF6 Circuit Breaker with associated Disconnect Switch and Earth Switch. This incomer feeder is given with the provision of bushing protruding from the enclosure of RMU for supply cable connection.
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FAQ'S
An RMU is a compact, factory-assembled, metal-enclosed MV switchgear that connects load points in a ring-type network to improve reliability and enable quick isolation; it is widely used in urban substations, compact kiosks, renewables, and estate or campus distribution.
Configurations are available across 11–36 kV classes with common feeder ratings up to 630 A and fault withstand options sized to project needs, covering 3-way to 5-way non-extensible or extensible lineups.
Solutions integrate numerical relays for OCR/EF/SEF, fault passage indicators, multifunction metering, and SCADA/PLC connectivity via Modbus/IEC protocols for remote monitoring and control.
Designs offer internal-arc classification, interlocks, visible earthing, sealed-tank technology (SF6 or eco/air alternatives), and IP-rated enclosures, minimizing maintenance and reducing outage time during isolation and restoration.
Yes—modular bays (Incomer, Feeder, Bus Coupler) support extensible architectures, cable entry options, motorized operation, and project-specific accessories, allowing phased expansion without long outages.