Three-position disconnector
Direct-drive SAX-12/T with uniform electric field distribution and high dynamic and thermal stability. Its dual-aperture mechanism incorporates mechanical and electrical interlocks.
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C-GIS · N₂ insulation
MAX 12 Series
Compact, maintenance-free cubicle-type switchgear for control, protection, and monitoring in primary distribution systems.
12kV
up to 3,150A
up to 40kA
N₂ Cubicle Type Gas Insulated Switchgear01 / Overview
High capacity.
Smaller footprint.
MAX-12 uses nitrogen at slightly positive pressure as its insulating medium, with a vacuum circuit breaker and three-position disconnector inside a sealed compartment.
The gas chamber is welded from 3 mm stainless steel. Its compact, long-life design reduces space requirements and protects primary components from environmental conditions.
For 12 kV three-phase systems with a single busbar or sectionalized single busbar: power generation, industrial and mining distribution, substations, and starting large high-voltage motors.
02 / Main components
Integrated architecture.
Clearly identified access.
- 01Main circuit breaker mechanism
- 02Disconnector mechanism
- 03Cable compartment
- 04Low-voltage compartment
- 05Busbar connection bushings
- 06Disconnector
- 07Arc device
- 08Gas tank
- 09Pressure relief device
- 10Protection relay
03 / Core technology
Direct actuation.
Reliable interlocking.
Main assemblies are integrated into modules designed to simplify control and enhance reliability.
Vacuum circuit breaker
Modular VAX-12/T assembly with optimized transmission and reliable interlocks for circuit switching.
Integrated electrical control
Reduces the number of secondary components and improves overall control system reliability.
04 / Technical specifications
12 kV performance.
Up to 40 kA.
Values from the MAX-12 Series v2 brochure's technical table. Final selection depends on the project configuration.
| Parameter | Value |
|---|---|
| Rated voltage | 12 kV |
| Rated frequency | 60 Hz |
| Rated continuous current | 1,250 / 2,500 / 3,150 A |
| Power-frequency withstand voltage, 1 min | 42 kV phase-to-phase and phase-to-ground · 48 kV across the isolating distance · 2 kV in auxiliary and control circuits |
| Lightning impulse withstand voltage | 75 kV phase-to-phase and phase-to-ground · 85 kV across the isolating distance |
| Rated short-time withstand current | 25 / 31.5 / 40 kA, 4 s |
| Rated peak withstand current | 63 / 80 / 100 kA |
| Short-circuit breaking current | 25 / 31.5 / 40 kA |
| Short-circuit making current | 63 / 80 / 100 kA |
| Circuit breaker electrical endurance | 30 operations |
| Rated operating sequence | O–0.3 s–CO–180 s–CO |
| Circuit resistance | ≤ 120 μΩ (1,250 A) · ≤ 80 μΩ (2,500 / 3,150 A) |
| Circuit breaker mechanical endurance | 20,000 operations |
| Disconnector / grounding switch | 5,000 operations |
| Rated filling pressure at 20 °C | 0.02 MPa |
| Annual leakage rate | ≤ 0.01% |
| Insulating gas | N₂ |
| Compartment protection | IP2X |
| Gas tank protection | IP67 |
| Enclosure protection | IP41 · IK10 |
| Internal arc classification | AFLR 31.5 kA / 1 s · 40 kA / 0.5 s |
Frequency: the technical table specifies 60 Hz, while the brochure overview mentions 50 Hz. Confirm the required frequency with Nexgrid.
05 / Modular configuration
A panel for
every network function.
The platform offers basic configurations for incoming and outgoing feeders, metering, bus ties, and sectionalizing.
Incoming / outgoing feederOverhead line incoming feederIncoming feeder with potential transformer (PT)Bus sectionalizing with circuit breakerBus sectionalizing with disconnectorPotential transformer (PT)
Bolted or welded mounting to the foundation channel. Level variation must not exceed 1 mm per meter. The foundation must support a maximum static load of 2,000 kg and a maximum impact load of 3,000 kg.600 mmWidth for 1,250 A · anchoring L1: 430 mm
800 mmWidth for 2,500 A · anchoring L1: 630 mm
1,000 mmWidth for 3,150 A · anchoring L1: 830 mm
2,000 kgReference maximum static load
06 / Operational advantages
07 / Reference standards
IEC references.
Listed in the brochure.
IEC 62271-100:2012 · alternating-current circuit breakers.
IEC 62271-105 · switch-fuse combinations.
IEC 62271-102 · disconnectors and grounding switches.
IEC 62271-103 · switches above 1 kV and up to 52 kV.
IEC 62271-200:2011 · metal-enclosed switchgear.
IEC 62271-1:2007 · common specifications.
08 / Configure MAX-12
Primary distribution capacity.
Compact design.
Share your diagram, rated current, short-circuit level, and required functions to define your MAX-12 configuration.