Custom medium-voltage switchgear has always been a balancing act: engineers want infinite flexibility, procurement wants off-the-shelf lead-times, and end-users want 31.5 kA performance yesterday. The withdrawable chassis from Degatech solves all three demands by offering a catalogue of pre-certified rail modules that bolt together like LEGO bricks, carry 4 000 A without forced cooling, and ship in 8 weeks instead of the usual 20.

Modularity starts with the rail. Each withdrawable chassis is built from 210 mm, 275 mm or 350 mm-wide extruded aluminium sections that share a common 60 mm pitch pattern. Horizontal and vertical braces are joined by drop-in dovetail keys—no welding, no re-machining. A five-axis CNC cell finishes critical surfaces to ±0.02 mm, ensuring that primary contacts align within 0.05 mm across the entire 4 000 A range. Because sections are reusable, panel builders can inventory 50 rails and assemble any rating from 630 A to 4 000 A without new fabrication, cutting WIP inventory by 60 %.

Current transfer is handled by silver-plated tulip contacts machined from tellurium copper, delivering 120 N force per finger and temperature rise <35 K at 4 000 A. The contact cage is over-moulded in PPS, giving a CTI of 600 V and eliminating separate insulating shrouds. A twin-row design accepts either 2 × 630 A bottles in parallel or a single 4 000 A vacuum bottle, so the same withdrawable chassis serves both feeder and bus-coupler roles—reducing SKU count from 18 to 3.

Interlocking is plug-and-play. A patented cam cartridge slides into the rail and provides three-stage safety: prevents racking under load, prevents earthing while live, and stops door opening if the breaker is not isolated. The cartridge is tested to 50 000 cycles and can be swapped in 90 seconds without tools, allowing OEMs to upgrade safety logic in the field without recalling panels.

Certification is pre-loaded. Each withdrawable chassis is type-tested to IEC 62271-200: 31.5 kA 1 s short-time, 80 kA peak making, 1 050 kV lightning impulse, and 100 000 mechanical operations. Test reports are valid for any assembly length, so panel builders can create custom widths without repeating $50 000 lab costs—saving 16 weeks and $200 k per project.

Logistics favour lightness. An aluminium extrusion weighs 40 % less than welded steel, cutting freight cost by $120 per chassis and allowing one person to carry a 400 mm section through a 2 100 mm doorway—no crane slot required. A knock-down kit ships in flat-pack form, reducing container volume by 55 % and enabling 1 000 units to fit in a single 40 ft HQ, a critical advantage for island nations or remote mining camps.

Assembly is tool-free. Primary contacts self-guide on bullet noses; secondary connectors lock with a quarter-turn twist that terminates 24 control wires and 12 sensor leads in one motion. A QR code on every rail links to an AR app that overlays torque values and wiring diagrams onto a tablet camera, cutting trainee assembly time from 90 minutes to 18.

Environmental credentials seal the deal. The withdrawable chassis is 98 % recyclable; aluminium is remelted, copper is re-rolled and PPS is reground into insulator pellets. Embodied carbon is 28 kg CO₂ per frame—versus 110 kg for welded steel—helping OEMs meet ISO 14001 and upcoming EU CBAM carbon-border tariffs.

Market traction has been rapid: 38 panel builders on four continents have adopted the withdrawable chassis, shipping 6 900 bays in 24 months with zero field weld repairs and an average lead-time of 7.5 weeks—40 % faster than their previous custom welded lines. Mean assembly labour has fallen from 22 hours to 9 per bay, a saving that translates into $1 800 per panel at European wage rates.

For CAD macros, UL witness-test data, or a complimentary cost-comparison spreadsheet that quantifies labour, inventory and certification savings, visit the product portal: withdrawable chassis from Degatech.