Reinforced modular structure
Side panels with double inward folds and a frame joined with stamped rivets. Elements can be replaced individually to reduce recovery time.
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Switchgear · Air-insulated
ROBUST I
Withdrawable metal-enclosed switchgear for distribution, control, metering, and protection in medium-voltage networks.
12 / 17.5 / 24kV
up to 4,000A
up to 40kA
Series Air-insulated Switchgear01 / Overview
Safe distribution.
Reliable operation.
ROBUST I is designed to receive and distribute power in three-phase AC networks from 3.6 to 24 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 and vacuum contactors.
02 / Design and safety
Built to
protect and respond.
Rapid pressure relief
Hinged top cover with nylon fasteners and an internal corrugated grille to facilitate pressure relief and limit the ejection of arc-generated particles.
Reliable interlocks
The upper rear door cannot open while the lower door is closed; the lower door cannot close while the upper door is open. The grounding interlock supports manual or motorized operation without changing parts.
Protected secondary control
All-metal secondary wiring channels help maintain signal transmission and facilitate rapid fault clearing.
03 / Technical specifications
Three voltage levels.
One robust platform.
Reference ratings. Final configuration depends on project conditions.
| Parameter | 12 kV | 17.5 kV | 24 kV |
|---|---|---|---|
| Rated frequency | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz |
| Rated current | ≤4,000 A | ≤3,150 A | ≤3,150 A |
| Power-frequency withstand voltage, 1 min | 28 kV | 38 kV | 50 kV |
| Lightning impulse, peak | 75 kV | 95 kV | 125 kV |
| Short-circuit breaking current | 40 kA | 31.5 kA | 31.5 kA |
| Short-circuit making current | 100 kA | 80 kA | 80 kA |
| Withstand current | 40 kA / 3 s | 31.5 kA / 3 s | 31.5 kA / 3 s |
| Enclosure protection | IP4X | IP4X | IP4X |
| Compartment protection | IP2X | IP2X | IP2X |
| Service continuity | LSC2B | LSC2B | LSC2B |
| Permissible internal arc duration | 1 s | 1 s | 1 s |
| Temperature-rise test | Ir | Ir | Ir |
| Peak withstand current | 100 kA | 80 kA | 80 kA |
| Power-frequency withstand voltage of auxiliary and control circuits | 2 kV | 2 kV | 2 kV |
| Cooling | Natural* | Natural* | Natural* |
* 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. Dimensions by voltage level as listed in the ROBUST I brochure.
| Cabinet type | Width W (mm) | Depth D (mm) | Height H (mm) |
|---|---|---|---|
| ROBUST I · 12 kV | 400, 500, 6001 / 650, 800, 1,000 | 1,450, 1,610, 1,750 | 2,240 |
| ROBUST I · 17.5 kV | 8002 / 1,0002 | 1,650, 2,000 | 2,240 |
| ROBUST I · 24 kV | 8002 / 1,000 | 1,800, 2,200 | 2,400 |
1. Bus riser cabinet. 2. Rated current below 1,250 A.
05 / Service conditions
Conditions outside these values are considered special and can be adapted to actual project requirements.
06 / Configure ROBUST I
Let's define the panel
for your application.
Share your project's voltage, current, short-circuit capacity, diagram, and service conditions.