What is an RMU used for?

An RMU is used for medium-voltage secondary distribution, especially loop-feed networks, compact substations, transformer protection and urban distribution points where space and installation speed matter.

What module combination should I request?

Please provide the incoming, outgoing, transformer protection and metering functions. Common RMU layouts include load-break switch modules, fuse-switch modules, vacuum breaker modules and metering modules.

How is RMU different from KYN28 switchgear?

RMU is compact and modular for secondary distribution and transformer feeders. KYN28 is a metal-clad withdrawable switchgear system used when the project needs higher feeder current, more protection functions and a larger primary distribution lineup.

Can RMU be installed inside a YB prefabricated substation?

Yes. RMU is commonly used as the medium-voltage section in compact substations, together with a distribution transformer and low-voltage switchgear.

What documents can be provided before delivery?

General arrangement drawings, single-line diagram confirmation, routine test report, packing list and nameplate data can be prepared according to the confirmed project scope.

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Home/Products/Medium Voltage Switchgear/Ring Main Units/RMU Series

RMU Series

12kV Ring Main Unit

Compact MV distribution layout

RMU is suitable for secondary distribution rooms, compact substations and utility distribution nodes where panel footprint is limited.

Loop-feed network configuration

Incoming and outgoing ring network modules can be arranged with transformer protection or metering modules according to the single-line diagram.

Transformer protection options

Fuse-switch or vacuum breaker protection can be reviewed according to transformer capacity, fault level and project specification.

Automation-ready by project

Motor operation, auxiliary contacts, RTU interface, CT/PT and communication options can be added when distribution automation is required.

RMU ring main unit for 12kV secondary distribution, 630A loop-feed networks, compact substations and transformer protection. Module combinations for incoming, outgoing, metering and fuse protection. IEC 62271 project configuration for utility, industrial and renewable-energy distribution.

Send RFQ for RMU Series WhatsApp Specs

Rated Voltage: 12 kV
Rated Capacity: 630 A
Frequency: 50Hz / 60Hz
Standard: IEC 62271 medium-voltage switchgear reference standard
Application: Utilities, Commercial Buildings, Solar, Infrastructure, Industrial Plants
Protection Level: Project configured
Installation Type: Project configured

RMU ring main unit is a compact medium-voltage switchgear solution for 12 kV secondary distribution, loop-feed networks, compact substations and transformer protection. Compared with a full metal-clad switchgear lineup, an RMU is usually selected when the project needs a smaller footprint, simpler feeder arrangement and fast installation. Buyers should confirm module combination, load break switch or vacuum breaker function, fuse protection, automation requirement, cable direction, enclosure condition and routine test scope before production.

What Buyers Should Confirm

Rated voltage, rated current, short-circuit level and system earthing method.
Module quantity and function: incoming, outgoing, transformer protection, metering or busbar section.
Load-break switch, fuse-switch or vacuum breaker requirement and relay or automation scope.
Cable entry direction, enclosure environment, routine test report and packing requirement.