Low-voltage compartment
Houses control, signaling, metering, and secondary protection devices.
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Ring Main Unit · Air-insulated
MXGN 24/36
Modular ring main unit for secondary distribution with air insulation, straightforward operation, and flexible configuration.
24 / 36kV
20 / 16kA · short-time
3 / 1s · respectively
Air Insulated Ring Main Unit01 / Overview
Simple structure.
Flexible distribution.
MXGN-24/36 is an air-insulated, fixed cubicle-type ring main unit for indoor installation, available in 24 and 36 kV versions.
The platform integrates switching, protection, and connection functions into modular panels. Its construction clearly organizes the low-voltage compartment, load-break switch, and enclosure for easy operation and maintenance.
01LVLow-voltage compartment
02LBSLoad-break switch
03ENCEnclosure
02 / Structure
Three zones.
Straightforward operation.
Functional separation helps organize control, switching, and protection within a compact enclosure.
Load-break switch
Performs switching, isolation, and grounding functions depending on the configuration.
Metal enclosure
Protects components and maintains an accessible layout for inspection and service.
03 / Modular configuration
Functions that fit
the diagram.
Panels can be arranged for power supply, protection, connection, and metering.
Load-break switch
Switching of distribution lines and feeders.
Cj configuration
Variant of the C module shown in the brochure's single-line diagram. Confirm your selection with the technical team.
Switch-fuse combination
Compact transformer protection.
Circuit breaker
Circuit protection using a power circuit breaker.
Vj configuration
Variant of the V module shown in the brochure's single-line diagram. Confirm your selection with the technical team.
Metering
Metering module with transformers, according to the brochure diagram.
Direct connection
Connection module with voltage indication, according to the required diagram.
04 / Technical specifications
Air insulation.
Two voltage levels.
Reference values from the MXGN-24/36 v2 brochure. Final selection depends on the project configuration.
| Parameter | MXGN 24 kV | MXGN 36 kV |
|---|---|---|
| Rated voltage | 24 kV | 36 kV |
| Rated frequency* | 60 Hz · to be confirmed | 60 Hz · to be confirmed |
| Rated current* | 630 A · to be confirmed | 630 A · to be confirmed |
| Power-frequency withstand voltage, 1 min (phase-to-phase and phase-to-ground / isolating distance) | 50 / 60 kV | 70 / 80 kV |
| Lightning impulse (phase-to-phase and phase-to-ground / isolating distance) | 125 / 145 kV | 170 / 195 kV |
| Rated short-time withstand current | 20 kA / 3 s | 16 kA / 1 s |
| Rated peak withstand current | 50 kA | 40 kA |
| Short-circuit making current | 50 kA | 40 kA |
| Transfer breaking current | 1,400 A | 630 A |
| Closed-loop breaking current | 630 A | 630 A |
| Maximum rated fuse current | 200 A | 63 A |
| Grounding switch mechanical endurance | M1, 2,000 operations | M1, 1,000 operations |
| Circuit breaker mechanical endurance | M2, 5,000 operations | M1, 1,000 operations |
| Electrical endurance | Class E3 | Class E3 |
| Enclosure protection | IP4X | IP3X (ASTA, per brochure) |
| Internal arc classification | A-FL · 16 kA / 1 s or 20 kA / 1 s | A-FLR · 16 kA / 1 s |
* The brochure shows 630 Hz for frequency and 60 A for rated current; these values appear to be reversed. The previous page's 60 Hz and 630 A are provisionally retained, subject to technical confirmation by Nexgrid.
05 / Family features
Two versions.
One modular family.
The brochure presents MXGN-24 and MXGN-36 versions and seven basic arrangements: C, Cj, F, V, Vj, M, and D. The arrangement is selected according to the project diagram.
InsulationAir-insulated ring main unit.
FlexibilityCombination of load-break switch, fuse, circuit breaker, and metering modules.
StructureLow-voltage compartment, load-break switch, and enclosure.
ProtectionInternal arc classification according to voltage and configuration.
06 / Rated characteristics
07 / Reference standards
IEC references.
Listed in the brochure.
IEC 62271-200 · metal-enclosed switchgear for voltages above 1 kV and up to 52 kV.
IEC 62271-105 · switch-fuse combinations.
IEC 62271-102 · disconnectors and grounding switches.
IEC 62271-103 · alternating-current load-break switches.
IEC 62271-1 · common specifications for high-voltage switchgear.
08 / Configure MXGN
Combine the functions
your network needs.
Share the voltage, diagram, current, and protection strategy to define your MXGN-24/36 arrangement.