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RMU cabinet series
Ring Main Unit Cabinets for 12 kV and 24 kV Cable Ring Networks
RMU cabinets for 12 kV and 24 kV cable ring networks, secondary substations, branch boxes and distribution terminals. Select gas-insulated, solid-insulated, SF6 or common-box modules by voltage class, module sequence and fault level.
12 / 24 kVGas, solid and SF6 insulatedC / F / V / CB modules
12 / 24 kV RMU scopeRatings cover 12 kV core products plus 24 kV XRM/SRM and HXGN15 options.
Gas, solid and SF6 optionsSeparate sealed gas-insulated, solid-insulated, common-box and SF6 ring network cabinets before model selection.
C / F / V / CB modulesUse load switch, fuse-combination, vacuum switch and circuit-breaker modules to define each RMU bay.
Series and ratings
Ring Main Unit Cabinet Series for 12 kV and 24 kV Networks
Compare insulation method, module function, rated current and breaking duty before requesting GA and single-line drawings.
Gas-insulated RMU
JLSRM-12 Gas-Insulated Ring Main Unit
12 kV gas-insulated RMU for 6 kV and 10 kV distribution systems, using modular C/V units, sealed stainless-steel tank construction and expandable bus options.
12 kV630 A classC and V modules20 kA V module
Fits compact cable ring or distribution-terminal duty where fixed or expandable modular RMU combinations are required.
Solid-insulated RMU
JLGTRM-12 Solid-Insulated Ring Main Unit
Solid-insulated RMU for 3.6-12 kV three-phase AC 50/60 Hz single-bus-section systems and distribution terminals.
12 kV630/1250 A25/31.5 kAIP4X
Use where a solid-insulated, fully sealed and shielded RMU cabinet is preferred for compact secondary distribution.
Common-box sealed RMU
XRM/SRM 12/24 Fully Insulated Common-Box RMU
Fully insulated and fully sealed common-box RMU for compact secondary power stations and medium-voltage distribution nodes.
12/24 kVC/F/V/CB modulesSF6 1.4 barGB3906
Use when a sealed common-box RMU with C, F, V or CB modules fits the site standard and cable interface.
SF6 ring network cabinet
HXGN15-12 SF6 Ring Network Cabinet
SF6 load-switch-based metal-enclosed ring network cabinet with an air-insulated cabinet structure and automation option.
12/24 kV1250/630 A bus20 kA / 3 sIP3X
Use for compact and expandable ring network cabinets where SF6 load-switch duty and interlocking need to be confirmed.
Solid-insulated switchgear
GTXGN-12V Solid-Insulated Switchgear
Modular full-insulation and full-sealing 12 kV solid-insulated switchgear with an independent low-voltage room.
12 kVLoad / combination / breaker20 kA breakerIP67
Use when modular solid-insulated switching, protection and metering functions need to share a compact cabinet assembly.
Voltage class
12 kV or 24 kVConfirm system voltage first. JLSRM, JLGTRM and GTXGN are 12 kV options; XRM/SRM and HXGN15 include 12/24 kV ratings.
Module sequence
C / F / V / CBDefine load switch, fuse-combination, vacuum switch, circuit breaker, earthing and metering bays before cabinet layout.
Insulation type
Gas, solid, SF6 or common-boxKeep the insulation method aligned with utility acceptance, maintenance plan, environmental policy and cable interface.
Rated current
125 A / 630 A / 1250 ACheck each bay current separately because fuse, load-switch, breaker and common-box modules do not share one current value.
Fault level
20 / 25 / 31.5 kA classesMatch short-circuit breaking, making, short-time withstand and peak withstand to the network calculation.
Cable interface
Cable size and expansion needConfirm cable entry, branch direction, expandable bus, room clearance, enclosure duty and automation interface before drawing release.
Site conditions
Ring Main Unit Application and Installation Conditions
Use RMU cabinets where compact MV switching is needed at a cable ring, secondary substation, branch box or distribution terminal. Check ambient limits and utility rules before fixing the cabinet type.
Cable ring networks
Use RMU cabinets for compact ring-main switching where load-switch, fuse-combination or breaker modules are arranged in a small lineup.
Secondary substations and switching stations
Use JLGTRM, XRM/SRM, HXGN15 or GTXGN where small secondary substations and switching stations need sealed MV switching.
Cable branch boxes and terminals
Use enclosed gas-insulated or solid-insulated RMU packages where cable branch, looped supply, terminal supply or distribution-terminal duty is required.
Transit, commercial and industrial sites
RMU applications include airports, subways, railways, tunnels, shopping malls, industrial sites, high-rise buildings and wind power sites.
Delivery controls
Ring Main Unit Drawings, Routine Tests and Packing
For production release, confirm the GA drawing, single-line and control drawings, routine test checklist and packing method before cabinet split and shipment.
General arrangement drawing
Cabinet lineup, module order, overall dimensions, cable compartment, busbar extension, foundation reference and room clearance.
Single-line and control drawings
Incoming and outgoing modules, load switch or breaker function, metering, protection, automation interface and terminal wiring.
Routine verification
Power-frequency withstand, insulation, mechanical operation, earthing operation, interlock, nameplate and protection-degree checks.
Packing and handling
Cabinet split, lifting point, moisture protection, SF6 or sealed-tank handling note, packing marks and destination standard.
What is a ring main unit used for?
A ring main unit is used for compact medium-voltage cable ring switching, secondary distribution, branch boxes, switching stations and distribution terminals.
How do I choose between gas-insulated and solid-insulated RMU cabinets?
Choose gas-insulated RMU when compact sealed construction and utility acceptance are the priority. Choose solid-insulated RMU when the project requires sealed solid insulation, reduced gas handling or a specific environmental policy.
What do C, F, V and CB modules mean in an RMU?
C is a load-switch module, F is a fuse-combination module, V is a vacuum switch module and CB is a vacuum circuit-breaker module. The exact sequence must match the single-line diagram.
When should RMU be selected instead of KYN28 switchgear?
Use RMU for compact cable ring networks and secondary distribution nodes. Use KYN28 when the project needs indoor metal-clad withdrawable VCB cabinets, relay chambers and switch room maintenance access.
What should be sent for an RMU cabinet quotation?
Send the single-line diagram, voltage class, module sequence, rated current, short-circuit level, cable size, enclosure requirement, metering or automation need, quantity and destination standard.
Engineering reviewReviewed July 7, 2026
Checked for RMU RFQ use against XIYA POWER specification data, model ratings and drawing requirements.
Selection dataSLD, modules and fault level
Final cabinet choice depends on voltage class, C/F/V/CB sequence, rated current, cable interface and site standard.
DocumentsGA, SLD and control drawings
Production release uses cabinet layout, single-line and control drawings, routine test checklist and packing method.
Quotation ruleProject-based scope
No standard cabinet package is assumed; quotation follows cabinet option, configuration, quantity, destination and Incoterms.
Project-based quotation
Request a Ring Main Unit Cabinet Quote
Send the single-line diagram, voltage class, module sequence, rated current, short-circuit level, cable size, enclosure requirement, metering or automation need, quantity and destination standard. XIYA POWER will confirm the RMU option, rating match, drawing scope, packing method and quotation.