RMU switching and interlocking

RMU OperatingMechanisms

Compare eight RMU operating mechanism configurations for GIS feeders, load switches, isolation, circuit-breaker duty, incoming/outgoing panels, and outdoor enclosures.

RMU operating mechanism assembly for medium-voltage switchgear
Mechanism range

RMU MechanismProduct Range

Select by switching role and panel interface, then open each mechanism for configuration-specific duty, interlock, drive, control, mounting, and RFQ inputs.

RMU mechanism selection

GIS incoming operating mechanism

Incoming GIS feeder mechanism for load-switch operation, earthing interlock, and panel linkage.

Engineering selection item Configuration and RFQ input
Application role Incoming GIS feeder and load-switch mechanism
Switching function Coordinate load switching, isolation, and earthing functions for the incoming panel
Operating sequence and interlocks Define close-open-earth sequence, key/mechanical interlocks, and earthing logic
Drive and control Specify manual or motor operation, control voltage, indication, and auxiliary contacts
Mechanical interface Provide mounting face, operating shaft or linkage direction, panel depth, and clearances
RFQ inputs GIS panel GA, single-line diagram, switching duty, quantity, destination, and project standard
Configuration drawingOpen the full-size drawing for interface review
GIS incoming operating mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

RMU mechanism selection

GIS outgoing operating mechanism

Outgoing GIS feeder mechanism for switching operation, earthing interlock, and panel linkage.

Engineering selection item Configuration and RFQ input
Application role Outgoing GIS feeder operating mechanism
Switching function Coordinate feeder switching, isolation, and earthing functions for the outgoing panel
Operating sequence and interlocks Define close-open-earth sequence and the required mechanical or key interlocks
Drive and control Specify operating mode, control voltage, position indication, and auxiliary contacts
Mechanical interface Provide panel mounting face, shaft/linkage direction, cable-side arrangement, and clearances
RFQ inputs Outgoing panel GA, feeder duty, interlock schedule, quantity, destination, and project standard
Configuration drawingOpen the full-size drawing for interface review
GIS outgoing operating mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

RMU mechanism selection

Spring operating mechanism

Spring-operated mechanism for circuit-breaker closing, tripping, interlocking, and auxiliary contacts.

Engineering selection item Configuration and RFQ input
Application role Stored-energy spring mechanism for vacuum circuit-breaker operation
Switching function Define circuit-breaker closing, tripping, and protection-operating requirements
Operating sequence and interlocks Specify close-trip sequence, anti-pumping, mechanical interlocks, and status indication
Drive and control Specify charging motor, manual charging, close/trip coil voltage, and auxiliary contacts
Mechanical interface Provide breaker linkage, mounting points, stroke/rotation direction, and service clearance
RFQ inputs Breaker duty, control schematic, panel GA, linkage detail, quantity, and delivery destination
Configuration drawingOpen the full-size drawing for interface review
Spring operating mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

RMU mechanism selection

Semi-solid seal isolation mechanism

Gas-insulated isolation mechanism for sealed interfaces, panel mounting, and service access.

Engineering selection item Configuration and RFQ input
Application role Operating mechanism for a sealed isolation interface
Switching function Define isolation and earthing functions required by the sealed switchgear compartment
Operating sequence and interlocks Specify isolator/earthing sequence, access interlocks, and position indication
Drive and control State manual or motor operation, control supply, indication, and auxiliary-contact schedule
Mechanical interface Provide seal interface, mounting face, linkage route, enclosure geometry, and service access
RFQ inputs Panel sectional drawing, sealed interface, operating sequence, quantity, and environmental conditions
Configuration drawingOpen the full-size drawing for interface review
Semi-solid seal isolation mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

Mechanism detail view
Semi-solid seal isolation mechanism mechanism detail

RMU mechanism selection

Outgoing line operating mechanism

Line-switching mechanism for close-open-earth operation, interlocking, and panel mounting.

Engineering selection item Configuration and RFQ input
Application role Outgoing line switching and earthing mechanism
Switching function Coordinate feeder close-open-earth operation for the outgoing cable circuit
Operating sequence and interlocks Define operating order, earthing permissive, door interlock, and position indication
Drive and control Specify manual/motor drive, control voltage, terminal interface, and auxiliary contacts
Mechanical interface Provide mounting face, shaft/linkage direction, cable-compartment arrangement, and clearances
RFQ inputs Outgoing circuit duty, panel GA, interlock logic, control schematic, quantity, and destination
Configuration drawingOpen the full-size drawing for interface review
Outgoing line operating mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

Mechanism detail view
Outgoing line operating mechanism mechanism detail

RMU mechanism selection

Spring circuit-breaker mechanism

Spring mechanism for circuit-breaker duty with closing, tripping, control, and auxiliary interfaces.

Engineering selection item Configuration and RFQ input
Application role Spring-charged mechanism for RMU circuit-breaker duty
Switching function Define breaker closing/tripping duty and coordination with the protection system
Operating sequence and interlocks Specify operating sequence, trip-free/anti-pumping needs, and panel interlocks
Drive and control State charging motor and close/trip coil voltage, manual backup, indication, and contacts
Mechanical interface Provide breaker shaft/linkage, mounting pattern, operating travel, and maintenance clearance
RFQ inputs Breaker type, duty and sequence, control diagram, panel drawing, quantity, and destination
Configuration drawingOpen the full-size drawing for interface review
Spring circuit-breaker mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

Mechanism detail view
Spring circuit-breaker mechanism mechanism detail

RMU mechanism selection

Spring incoming-line mechanism

Incoming-feeder spring mechanism for stored-energy drive, switching duty, and control interlocks.

Engineering selection item Configuration and RFQ input
Application role Stored-energy mechanism for an incoming RMU feeder
Switching function Define the incoming feeder switching and isolation duty for the selected panel
Operating sequence and interlocks Specify close-open-earth sequence, upstream/downstream interlocks, and indication
Drive and control State spring charging method, control voltage, remote/local operation, and contacts
Mechanical interface Provide incoming panel mounting face, linkage direction, shaft position, and clearances
RFQ inputs Incoming circuit duty, SLD, panel GA, control requirement, quantity, and delivery destination
Configuration drawingOpen the full-size drawing for interface review
Spring incoming-line mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

Mechanism detail view
Spring incoming-line mechanism mechanism detail

RMU mechanism selection

IP67 outdoor RMU mechanism

Outdoor RMU mechanism for IP67 enclosure applications, panel mounting, and site conditions.

Engineering selection item Configuration and RFQ input
Application role Outdoor RMU operating mechanism for an IP67 enclosure arrangement
Switching function Define load switching, isolation, earthing, or breaker operation for the outdoor panel
Operating sequence and interlocks Specify sequence, access/earthing interlocks, lockout, and position indication
Drive and control State manual or motor operation, control supply, external indication, and contacts
Mechanical interface Provide enclosure interface, external handle/shaft position, sealing points, and mounting pattern
RFQ inputs Outdoor panel drawing, site conditions, ingress-protection requirement, quantity, and destination
Configuration drawingOpen the full-size drawing for interface review
IP67 outdoor RMU mechanism configuration drawingOpen full-size drawing ↗

Use the full-size drawing to coordinate the general mechanism layout, operating direction, linkage points, mounting interface, and service access for the selected panel.

Mechanism detail view
IP67 outdoor RMU mechanism mechanism detail

Project engineering

RMU MechanismProject Inputs

Define the switchgear interface, switching duty, operating sequence, drive and control circuit, interlocks, site conditions, and delivery requirements before quotation.

RMU operating mechanism and switchgear panel control interfaces
RMU mechanism and control-interface views for coordinating mounting, linkage, operating access, terminals, indication, and auxiliary contacts.

Define the mechanism interface

Panel and mounting interface

Send the switchgear type, mounting face, linkage direction, and available operating clearance.

Switching sequence and interlocks

State the switching function, close-open-earth sequence, mechanical interlocks, and any earthing requirement.

Control circuit and auxiliary contacts

Specify the control voltage, charging method, terminal interface, auxiliary contacts, and required indication.

Proposal output

Quotation-ready engineering brief

Send the application, panel layout, switching sequence, control requirements, quantity, and destination so the mechanism configuration and drawing scope can be prepared for quotation.

Request a technical proposal

OEM / ODM adaptation

Custom mounting, marking, interfaces, and component integration for your switchgear build.

Documentation and quality

Inspection, traceability, and documentation deliverables aligned with the order requirement.

Packing and delivery

Quantity, destination, packing requirement, and delivery terms prepared for quotation.

RMU Mechanism FAQ

RMU MechanismTechnical FAQ

Use these checkpoints to distinguish mechanism duty and prepare a complete RMU operating mechanism enquiry.

What information is needed to select an RMU operating mechanism?

Provide the RMU application, switching function, panel general arrangement, mounting face, linkage or shaft direction, operating sequence, interlocks, control voltage, auxiliary contacts, quantity, and destination.

How do I distinguish load-switch, isolation, and circuit-breaker mechanisms?

Start with the switching duty and operating sequence. Then coordinate the drive type, earthing function, interlocks, control circuit, shaft or linkage interface, panel clearances, and the selected switch or breaker.

Can an RMU mechanism be matched to an existing panel?

Suvell can assess a compatible mechanism or adaptation from the panel layout, mounting face, shaft or linkage direction, operating clearance, interlock logic, and available mechanism photographs or drawings.

What should be included in an RMU mechanism RFQ?

Send the single-line diagram and panel drawing, switching duty, operating sequence, interlocks, control voltage, auxiliary-contact schedule, site conditions, quantity, destination, and any existing nameplate or mechanism photographs.

Project inquiry

RMU MechanismProject RFQ

Send the switching duty, panel and mounting interface, operating sequence, interlocks, control requirements, site conditions, quantity, and destination.

Send the essentials

Panel GA, mounting face, and linkage directionSwitching duty, sequence, and interlocksDrive type, control voltage, and auxiliary contactsSite conditions and ingress-protection requirementQuantity, destination, packing, and delivery termsSingle-line diagram, nameplate, or mechanism photos