Grounding interlock
New interlock with low operating force, long service life, and high stability, designed to simplify assembly, commissioning, and maintenance.
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Switchgear · Air-insulated
ROBUST II
Withdrawable metal-enclosed switchgear for distribution, control, metering, and protection in medium-voltage networks.
40.5kV
up to 3,150A
31.5kA
Series Air-insulated Switchgear01 / Overview
Safe distribution.
Reliable operation.
ROBUST II is designed to receive and distribute power in three-phase AC networks up to 40.5 kV at 50 or 60 Hz.
It integrates circuit control, metering, and detection functions and can be used in single-busbar and sectionalized-busbar systems. The withdrawable unit accommodates vacuum circuit breakers.
02 / Design and safety
Built to
protect and respond.
Adaptable limit switch
Device that compensates for adjustment clearances in the front, rear, and lateral directions within a ±5 mm range.
Secondary interlock
Adapted to a truck travel of 510–610 mm, with 58- and 46-pin connectors compatible with the mechanisms described in the brochure.
Internal busbar layout
The internal layout maintains the exterior dimensions and allows air clearances ≥300 mm at busbars and their connections; the brochure excludes phase-to-phase clearance.
Reinforced truck
Truck base with a rail structure, manufactured using a dedicated welding fixture for reinforcement and stability.
Protected secondary circuits
All-metal channels protect secondary wiring from arcs and maintain signal transmission to the protection system for rapid fault clearing.
03 / Technical specifications
40.5 kV.
Capacity and continuity.
Reference ratings. Final configuration depends on project conditions.
| Parameter | Value |
|---|---|
| Rated voltage | 40.5 kV |
| Rated frequency | 50 / 60 Hz |
| Rated current | ≤3,150 A |
| Temperature-rise test | Ir |
| Power-frequency withstand voltage, 1 min | 95 kV |
| Lightning impulse, peak | 185 kV |
| Short-circuit breaking current | 31.5 kA |
| Short-circuit making current | 80 kA |
| Withstand current and duration | 31.5 kA / 3 s |
| Peak withstand current | 80 kA |
| Power-frequency withstand voltage of auxiliary and control circuits | 2 kV |
| Enclosure protection | IP4X |
| Compartment protection | IP2X |
| Service continuity | LSC2B |
| Cooling | Natural* |
| Permissible internal arc duration | 1 s |
* Air cooling must be used for rated currents ≥3,150 A, according to the brochure.
04 / Enclosure dimensions
Dimensions for
every configuration.
Dimensions in millimeters. Configurations identified by height, according to the ROBUST II brochure dimensions.
| Cabinet type | Width W (mm) | Depth D (mm) | Height H (mm) |
|---|---|---|---|
| ROBUST II · height 2,000 mm | 1,200* / 1,400 | 2,800, 3,000 | 2,000 |
| ROBUST II · height 2,400 mm | 1,200 | 2,800, 2,600 | 2,400 |
* Width of 1,200 mm for rated current ≤1,250 A in the ROBUST II cabinet · height 2,000 mm.
05 / Service conditions
Conditions outside these values are considered special and can be adapted to actual project requirements.
06 / Configure ROBUST II
Let's define the panel
for your application.
Share your project's voltage, current, short-circuit capacity, diagram, and service conditions.