HV, MV & LV Switchgear

Medium-Voltage Ring Main Unit

A compact RMU for ring or radial networks with load-break, fused-switch or circuit-breaker functions.

Rated voltage: 12–40.5 kV
Capacity range: Up to 1250 A typical
Standards basis: IEC 62271 series
Typical application: urban distributio…

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Technical product selection

Typical Use

Where this product is used

urban distribution, compact substations, renewable plants and commercial networks

Technical Data

Typical technical parameters

The published values define the normal selection range. Final ratings and interfaces are confirmed against the approved single-line diagram and destination requirements.

Design standardIEC 62271 series

ConfigurationUtility, renewable and industrial power systems

Applicable standards

IEC 62271 series

Rated voltage

12–40.5 kV

Rated capacity

Up to 1250 A typical

System frequency

50 Hz or 60 Hz, as specified

Rated current / fault level

Up to 1250 A typical

Internal arc classification

Specified where applicable

Protection and control

Relay, metering, communication and interlocking per project

Application

urban distribution, compact substations, renewable plants and commercial networks

Ambient and altitude

Confirmed from site conditions

Testing and inspection

Routine tests plus agreed type, special and third-party inspection requirements

Documentation

Drawings, data sheets, test reports, manuals and packing documents

These values are for product selection. Final guaranteed values are confirmed in the approved technical agreement.

Configuration

Details to confirm before production

Confirm these items so the quotation and product design match your project.

System ratings

Confirm rated voltage, continuous current, short-time withstand current, peak current and neutral earthing.

Functional units

Define incomers, bus couplers, feeders, motor circuits, capacitor banks, metering and spare ways.

Safety and access

State internal-arc classification, segregation, withdrawable or fixed construction and maintenance philosophy.

Protection and automation

Provide relay functions, CT/VT data, interlocks, communications protocol and SCADA signal list.

Normal supply

Typical standard equipment

Busbar and earthing system
Circuit breaker or switching devices
Mechanical and electrical interlocks
Protection and metering compartments
Control wiring and terminal blocks
Labels, mimic and operating accessories

Project options

Common optional equipment

Arc-flash detection
Remote racking or operation
IEC 61850 communications
Power quality metering
Automatic transfer and bus sectionalizing
Condition monitoring and temperature sensing

Testing and Documents

Tests and documents supplied with the product

The required tests and documents are confirmed before the order is placed.

Routine verification

Dielectric, main-circuit resistance, mechanical operation, wiring, interlock and functional checks according to the applicable switchgear standard.

Design and type evidence

Applicable type-test evidence or agreed design verification is reviewed during technical approval.

Special testing

Sound, temperature-rise, impulse, partial-discharge or other special tests are included only when specified.

Document package

Approved drawings, data sheets, test reports, manuals, packing list and agreed quality records.

A compact RMU for ring or radial networks with load-break, fused-switch or circuit-breaker functions.

Product overview

Medium-Voltage Ring Main Unit is configured for urban distribution, compact substations, renewable plants and commercial networks. Apex coordinates technical review, qualified production, documentation and export delivery according to the approved project requirements.

Applications

urban distribution, compact substations, renewable plants and commercial networks. Final design considers the system study, load profile, fault level, installation environment, efficiency targets and local grid requirements.

Quotation Information

What to include with your inquiry

Send the information you already have. Unknown items can be confirmed during technical review.

System voltage and frequency
Rated current
Short-circuit level and duration
Single-line diagram and feeder quantity
Circuit breaker, RMU or GIS arrangement
Protection, metering and communication requirements
Internal-arc and IP requirements
Applicable standard
Quantity
Destination country and delivery location

FAQ

Questions buyers usually ask

What fault rating should be specified?

The short-time withstand and breaking ratings must be selected from the calculated fault level at the switchboard, including future network configuration and source contribution.

Which standard should be stated in the RFQ?

Use the project or utility standard stated in the specification. Where it is not defined, send the destination, system voltage and application so the appropriate IEC or ANSI/IEEE basis can be proposed.

Are guaranteed values the same as the website values?

No. Website values are selection guidance. Guaranteed performance is stated in the approved technical data sheet and commercial offer.

What information helps Apex respond faster?

A single-line diagram, load data, voltage ratio, capacity, quantity, installation conditions, destination and required delivery date provide the best starting point.

Applications

Choose equipment for the site and operating conditions.

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Technical Articles

Product selection and application guides.

View Technical Articles →

TECHNICAL ARTICLE

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Medium-Voltage Ring Main Unit

Where this product is used

Typical technical parameters