RMU vs MV Switchgear: What Is the Difference?

Direct answer: An RMU is a compact type of medium-voltage distribution switchgear designed mainly for ring networks, feeder switching and transformer protection. MV switchgear is the broader category and includes RMUs, metal-enclosed panels, withdrawable VCB switchgear and other assemblies.

Key Points

• RMU: compact ring-network distribution and transformer feeders
• MV switchgear: broader term covering multiple architectures
• RMU commonly uses C, V, F, PT and metering functional units
• Selection depends on voltage, current, fault level, protection and room layout

Selection Guidance

Choose an RMU for compact distribution, secondary substations, renewable-energy collection and space-constrained projects. Choose panel-type MV switchgear when the project needs higher bus current, extensive protection, withdrawable breakers or complex bus arrangements.

Information Required for Engineering Review

Provide the nominal voltage, highest system voltage, rated current, short-circuit level and duration, frequency, application, SLD, BOQ, protection requirements, cable details, installation conditions and quantity. Qiangchi will confirm the project-specific configuration and document requirements.

Engineering Documents and FAT

Available project support may include configuration review, technical clarification, GA drawing, typical SLD coordination, component schedule, routine-test documentation, FAT planning and export packing. Final scope is confirmed according to the approved specification.

Frequently Asked Questions

Can the final selection be made from the voltage and current alone?

No. The SLD, fault level, functional units, protection, cables and service conditions must also be reviewed.

Are all configurations the same size?

No. Dimensions depend on voltage class, functional units, cable arrangement and optional devices. Use the approved GA drawing.

Can Qiangchi review an EPC specification?

Yes. Send the SLD, BOQ and specification for a project-specific technical review.

What is checked during FAT?

The FAT scope may include visual and mechanical checks, wiring verification, interlock checks, functional tests and routine electrical tests according to the agreed inspection plan.

Which standards apply?

The applicable IEC or project standard is confirmed during technical clarification. Project-specific requirements must be stated before design approval.

Where can I compare related products?

Review RMU range, product comparison or use the Medium Voltage Product Finder.