IP67 gas tank
Medium-voltage components remain protected from dust and moisture in a sealed compartment.
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C-GIS · SF₆ insulation
MGX 36
Compact, modular cubicle-type switchgear for primary distribution with demanding continuity and safety requirements.
40.5kV
up to 3,150A
up to 31.5kA · short-time, 4 s
Cubicle Type Gas Insulated Switchgear01 / Overview
High capacity.
Compact format.
MGX-36 combines SF₆ gas insulation, modular construction, and a cubicle-type enclosure for networks up to 40.5 kV.
The platform covers rated currents of 1,250, 2,500, and 3,150 A, with functions for incoming and outgoing feeders, metering, bus ties, and sectionalizing. It is designed for applications where availability and efficient use of space are critical.
02 / Safety and performance
Comprehensive protection.
Long-term operation.
Internal arc classification
31.5 kA AFLR design for 1 second, providing front, lateral, and rear protection.
High mechanical endurance
20,000 circuit breaker operations; 10,000 for 3,150 A. Disconnectors and grounding devices support 5,000 operations, according to the brochure.
Low operating pressure
Rated filling pressure of 0.02 MPa at 20 °C and a specified annual leakage rate of ≤0.01%.
03 / Technical specifications
Performance for
primary distribution.
Values from the MGX-36 v2 brochure's technical table. Final selection depends on the project configuration.
| Parameter | Value |
|---|---|
| Rated voltage | 40.5 kV |
| Rated frequency | 60 Hz |
| Rated current | 1,250 / 2,500 / 3,150 A |
| Power-frequency withstand voltage, 1 min: phase-to-phase and phase-to-ground | 95 kV |
| Power-frequency withstand voltage, 1 min: isolating distance | 118 kV |
| Auxiliary and control circuit withstand voltage | 2 kV |
| Lightning impulse: phase-to-phase and phase-to-ground | 185 kV |
| Lightning impulse: isolating distance | 215 kV |
| Rated short-time withstand current | 25 / 31.5 kA, 4 s |
| Rated peak withstand current | 63 / 80 kA |
| Short-circuit current Isc* | 25 / 31.5 kA · function to be confirmed |
| Short-circuit making current | 63 / 80 kA |
| Circuit breaker electrical endurance | 30 operations |
| Rated operating sequence | O–0.3 s–CO–180 s–CO |
| Circuit breaker mechanical endurance | 20,000 operations · 10,000 for 3,150 A |
| Disconnector / grounding switch endurance | 5,000 operations |
| Circuit resistance | ≤ 120 μΩ (1,250 A) · ≤ 80 μΩ (2,500 A) · ≤ 50 μΩ (3,150 A) |
| Rated gas pressure at 20 °C | 0.02 MPa |
| Annual leakage rate | ≤ 0.01% |
| Insulating gas | SF₆ |
| Compartment protection | IP2XC |
| Tank protection | IP67 |
| Enclosure protection | IP41 · IK10 |
| Internal arc classification | AFLR 31.5 kA / 1 s |
* The brochure labels both 25 / 31.5 kA (Isc) and 63 / 80 kA as “short-circuit making current.” Confirm the function corresponding to Isc with Nexgrid before selecting the equipment.
04 / Configurations
Functions for
every point in the network.
Incoming / outgoing feeder
Main panel for power supply or distribution to load circuits.
Overhead incoming feeder
Overhead incoming configuration listed as “Overhead Incoming” in the brochure.
Incoming feeder with VT
Incoming feeder function with an integrated voltage transformer.
Bus tie with circuit breaker
Busbar sectionalizing with a power circuit breaker.
Bus tie with disconnector
Busbar connection configuration with an isolation function.
VT metering
Panel dedicated to voltage metering and protection signals.
05 / Installation
A precise foundation
for a stable system.
The switchgear can be bolted or welded to the foundation channel. Channel flatness must be controlled to ensure alignment, operation, and proper load distribution.
≤1 mm/mMaximum permitted channel unevenness
2,000 kgReference maximum static load
3,000 kgReference maximum impact load
| Panel width L | Anchoring dimension L1 |
|---|---|
| 600 mm | 430 mm |
| 800 mm | 630 mm |
| 1,000 mm | 830 mm |
The dimension table assigns 600 mm to 1,250 A and 1,000 mm to 3,150 A. For 2,500 A it prints “65 mm,” while the anchoring table includes a width of 800 mm. Confirm the width of the 2,500 A version with Nexgrid.
06 / Operational advantages
07 / Reference standards
IEC references.
Listed in the brochure.
IEC 62271-1 · common specifications.
IEC 62271-100 · alternating-current circuit breakers.
IEC 62271-102 · disconnectors and grounding switches.
IEC 62271-103 · switches above 1 kV and up to 52 kV.
IEC 62271-105 · switch-fuse combinations.
IEC 62271-200:2011 · metal-enclosed switchgear.
IEC 60044-2 · inductive voltage transformers.
IEC 60044-1 · current transformers.
08 / Configure MGX-36
Add capacity
without excess space.
Share your diagram, rated current, short-circuit level, and required functions to define your C-GIS configuration.