A2ZMEMDEX Metal-Enclosed Modular Switchgear

A2ZMEMDEX is not a single fixed panel. It is a modular medium-voltage switchgear platform from which complete lineups are assembled according to the required incoming feeders, outgoing feeders, transformer protection, metering, bus sectionalising, auxiliary supply and generation-interface functions.

The busbar and cable-connection areas are air insulated. Depending on the selected cubicle function, the switching arrangement may use a load-break switch, rotary disconnector, gas-insulated disconnector, fixed circuit breaker or withdrawable circuit breaker. The final switching devices, protection relays, current and voltage transformers, metering equipment and control scheme are selected against the approved electrical design.

The enclosure is intended for indoor service and is divided into functional sections for the main busbar, switching equipment, cable and apparatus connections, operating mechanisms and low-voltage control equipment. Front operation, mechanical interlocking and modular side-by-side construction support safe operation, straightforward installation and future lineup extension when this is allowed by the project design.

The range is suitable for medium-voltage distribution centres, MV/LV transformer substations, compact substations, industrial plants, generation facilities, infrastructure projects and other installations requiring a project-specific indoor switchgear lineup.

Main Advantages

• One modular family for 12, 24 and 36 kV systems
• Rated-current range from 630 to 1,250 A
• 16, 20 and 25 kA short-time withstand options, subject to the selected configuration
• Nineteen published functional cubicle arrangements
• Modular right- and left-side extension capability
• Front operation, inspection and control
• Separate functional areas for busbar, switching, cable connections, mechanisms and low-voltage equipment
• Load-break switch, rotary-disconnector, gas-insulated-disconnector and circuit-breaker arrangements
• Fixed and withdrawable circuit-breaker alternatives for relevant projects
• Mechanical interlocking to help prevent incorrect switching sequences
• Project-specific protection, metering, motor operation, communication and SCADA options
• Galvanized structural construction with electrostatic powder-coated visible panels

Functional Construction

Main Busbar Section

Located in the upper part of the cubicle and used to connect the main busbars across adjacent units in the lineup.

Switching Section

Contains the load-break switch, rotary disconnector or gas-insulated disconnector selected for the cubicle function.

Cable, Busbar and Apparatus Section

Provides the medium-voltage cable connection area. Depending on the configuration, this section may contain a circuit breaker, current transformers, voltage transformers, earthing switch, MV fuses, capacitive voltage indicators or surge arresters.

Operating-Mechanism Section

Contains the operating mechanisms and interlocks for the circuit breaker, disconnector, load-break switch and earthing switch used in the selected cubicle.

Low-Voltage Control Section

Accommodates the protection relays, auxiliary relays, meters, indication lamps, pushbuttons, terminals and related control equipment required by the project.

Enclosure Construction

• Structural frame manufactured from 2 mm pre-galvanized and 3 mm electro-galvanized sheet steel
• Painted sections manufactured from 2 mm cold-rolled sheet steel
• Front-visible painted parts finished with polyester-based electrostatic powder coating
• Other metal parts protected by electro-galvanized coating
• Indoor enclosure protection degree: IP3X
• Final colour, coating system and corrosion-protection requirements to be confirmed for the destination environment

*The required combination of voltage, frequency, rated current, short-time current and duration must be confirmed for the selected cubicle type together with the supporting technical and conformity documents. Not every published rating should be assumed to be available in every configuration.

Reference Dimensions

Dimensions shown in the combined visual are reference dimensions from the published drawings. The final general arrangement, cable-entry details, room clearances and trench dimensions must be approved for the actual lineup before production.

3. Available Cubicle Configurations

The following functions should be shown as selectable configurations under the single A2ZMEMDEX product page. They should not be published as nineteen separate products.

Important Configuration Note

The combined image is a configuration map, not a complete project single-line diagram. A complete switchgear lineup may use several cubicle types in sequence. The required quantity, order, busbar direction, protection logic, interlocking, cable entry and auxiliary systems must be defined by the approved project design.

Standard and Optional Project Equipment

Depending on the selected cubicle, the project may include:

• Main copper busbars and earthing busbar
• Load-break switch, rotary disconnector or gas-insulated disconnector
• Fixed or withdrawable circuit breaker
• Earthing switch and mechanical interlocking
• MV fuses and striker-operated tripping arrangement
• Current transformers and voltage transformers
• Capacitive voltage indication
• Surge arresters
• Protection relays and auxiliary relays
• Ammeters, voltmeters, multifunction meters or energy analysers
• Fault indicators
• Local / remote selector switches, pushbuttons and indication lamps
• Motor operators and opening / closing coils
• AC and DC auxiliary-supply equipment
• Communication gateway and SCADA interface
• Project-specific terminal blocks, test terminals and wiring

All components, brands, ratings and quantities must be listed in the approved bill of materials before order confirmation.

Intended Applications

• Medium-voltage distribution centres
• MV/LV transformer substations
• Indoor rooms of compact concrete or metal substations
• Industrial plants and organised industrial zones
• Power-generation facilities
• Renewable-energy projects
• Generator buildings and embedded-generation interfaces
• Water and wastewater facilities
• Mining, oil and gas and process-industry sites
• Airports, hospitals, commercial buildings and infrastructure projects

Technical and Commercial Notes

• The final lineup must be engineered from the approved single-line diagram and protection philosophy.
• Equipment ratings must match the local network voltage, frequency, earthing system, short-circuit level and utility requirements.
• Circuit-breaker, disconnector, CT, VT, fuse and relay ratings are not interchangeable between projects.
• Internal-arc classification, loss-of-service-continuity class, partition class and accessibility requirements must be stated explicitly when required.
• Final room layout, front operating clearance, rear clearance, ceiling clearance, cable trench and cable bending radius must be approved before manufacture.
• Remote control and SCADA functions require the communication protocol, I/O list, auxiliary voltage and control architecture to be defined.
• Type-test reports, routine-test reports and certificates must be confirmed against the exact offered model and rating before any compliance statement is published or included in a tender.
• Packing format, split-line shipment, lifting points and transport dimensions are confirmed after the final general arrangement is approved.

Recommended Call to Action

Send us your single-line diagram and technical specification. We will configure the required A2ZMEMDEX feeder, protection, metering and bus-coupling cubicles and prepare a project-specific technical and commercial offer.

Certification Status

The TSE modular-switchgear certificate currently linked on the source website is certificate 000361-TSE-01/03. It states a validity date ending 27 June 2026 and therefore appears expired as of this review date, 21 August 2026. It must not be described as a current certificate until a renewed document is received and verified.

The expired document covers a defined 36 kV, 50 Hz, 630 A and 16 kA / 1 s scope under TS EN 62271-200. It does not by itself support a blanket certification claim for every 12 / 24 / 36 kV, 630-1,250 A and 16 / 20 / 25 kA configuration shown on the product page.

Source-Data Differences

• The live technical table gives the 36 kV lightning impulse withstand value across the isolating distance as 195 kV peak. One catalogue table shows 180 kV. The live value of 195 kV is used in this content because it matches the published 12 / 24 / 36 kV insulation-level sequence; written confirmation should still be obtained in the final datasheet.
• The live page presents a voltage-dependent short-circuit making-current row that does not map clearly to all 16 / 20 / 25 kA short-time-current options. That row was intentionally omitted from the customer-facing table. The required peak making current must be confirmed for the selected configuration.
• The live page lists 50 / 60 Hz while the linked certificate covers 50 Hz. A 60 Hz project therefore requires explicit technical and documentary confirmation.
• The 800 VA and 4,000 VA auxiliary-service entries link to the same published drawing, and that drawing is labelled 800 VA. A confirmed 4,000 VA drawing and bill of materials are required before quotation.
• The published transformer-protection drawing for configuration 13 and the voltage-transformer transformer-protection drawing for configuration 16 appear identical. Their final single-line diagrams, functions and equipment lists must be confirmed separately.
• The source hero image contains a visible original model marking. Request a clean A2ZMEMDEX-labelled or unbranded production photo instead of altering the equipment texture.

Information Required Before Quotation

Please share the following information so the correct cubicle lineup, ratings, protection system, documentation and supply scope can be confirmed:

• Destination country and project name, address or coordinates
• Complete single-line diagram and bill of quantities
• Utility or end-user technical specification
• Nominal system voltage and highest system voltage
• Rated frequency: 50 or 60 Hz
• Network earthing method and neutral arrangement
• Required rated busbar current
• Prospective short-circuit current, peak making current and required duration
• Required number and sequence of incoming, outgoing, transformer, metering, coupling and auxiliary-service cubicles
• Transformer ratings, vector groups, impedance and primary / secondary voltages
• Generator or embedded-generation ratings for autoproducer applications
• Preferred switching device: load-break switch, rotary disconnector, gas-insulated disconnector, fixed circuit breaker or withdrawable circuit breaker
• Circuit-breaker operating duty and required interrupting capacity
• CT ratios, cores, accuracy classes, burdens and protection requirements
• VT ratios, winding arrangement, accuracy classes, burdens and fuse requirements
• Protection-relay make / model preference, required functions and protection settings philosophy
• Metering, energy analysis and fault-indication requirements
• AC and DC auxiliary voltages, battery system and control-voltage requirements
• Motor-operation, local / remote control and electrical interlocking requirements
• SCADA or automation protocol, I/O list and communication architecture
• Cable type, conductor material, cross-section, number of cables per phase and entry direction
• Required cable terminations, surge arresters and earthing arrangement
• Internal-arc classification, accessibility, service-continuity class, partition class and protection-degree requirements
• Applicable IEC, national, utility, tender and certification requirements
• Required type-test, routine-test, inspection, FAT and documentation package
• Indoor ambient temperature, altitude, humidity, pollution, seismic and corrosivity conditions
• Switchgear-room layout, access route, maximum transport dimensions and lifting restrictions
• Cable-trench dimensions, floor openings, front / rear clearances and future extension direction
• Required paint colour, mimic diagram, labels, warning plates and document language
• Required spare parts, special tools, installation supervision, commissioning and training
• Delivery address or destination port, Incoterm and required delivery date