Power Distribution
& Critical Power
Machined copper and cast enclosure hardware for critical power.
MES machines, extrudes, casts and forges the metal components inside UPS, busway and rack distribution equipment — in eight countries, with our own engineers on the floor.
5 Pressures on Critical Power Sourcing
Five pressures on critical power sourcing that were not there three years ago.
Rack density
Rack-level draw multiplied with AI compute. A busway sized for a conventional hall is undersized for an AI hall.
Machining capacity, not copper
Copper is available. The operators and equipment to hold 0.05 mm flatness and plating quality on it are booked — which is why lead times moved further than prices.
Copper cost basis
Since April 2026, Section 232 duty on covered copper is assessed on full customs value, not metal content.
Joint integrity
Bolted aluminum joints creep under thermal cycling. Plating, torque and belleville hardware are the failure mode, and they are set on the drawing.
Modularity
Prefabricated skids moved assembly upstream. A part that was fitted on site now has to arrive correct.
Why Critical Power Manufacturers Work With MES
Because a bus joint conducts through its plating, not its base metal. A bar bowed 0.2 mm at the joint face makes contact across a fraction of its nominal area, and the resistance rise shows up as heat years later.
We measure every lot at source. We review the drawing before the tool is cut.
Certified & Global
- ISO 9001:2015 since 2009
- IATF 16949
- NMSDC Minority-Certified
- Eight countries
- Supplying global power management manufacturers including Eaton
WE MEASURE THE JOINT FACE, EVERY LOT
Flatness to 0.05 mm and edge condition where the current crosses. First article on 100% of features, then 5 pieces per lot.
WE REVIEW THE DRAWING FIRST
A plating spec with no thickness. 6063 called out where 6101 is needed. DFM feedback in 5 business days, at no cost.
WE MEASURE PLATING AT THE JOINT
Not on the flat. Thickness verified at the contact face by XRF, per lot.
WE EMPLOY THE ENGINEERS IN THE PLANT
Same country, same floor, the day your parts run. Not a quarterly audit the factory prepared for.
Three Applications. One Copper Capability.
Wherever current crosses a bolted joint and has to survive thirty years of thermal cycling, the same machined and plated copper applies.
DATA CENTER CRITICAL POWER
A third of planned 2026 openings slipped, and electrical equipment held them up — not chips.
Components
Busbar · bus stabs · joint blocks · busway housings · tap-off boxes · UPS enclosures · IGBT heat sink bases · PDU bodies
Materials
C11000 copper · 6101-T6 · 6063-T6 · A380 aluminum · Zamak 3/5
The Spec That Matters
0.05 mm flatness at the joint face, called out separately from the profile tolerance.
Vertiv · Starline · E+I Engineering · Legrand · Anord Mardix · APC · Piller
RACK & ENCLOSURE INFRASTRUCTURE
The frames, rails and cable management that hold IT equipment and route power to it.
Components
Rack frames · mounting rails · structural brackets · cable trays · blanking panels · leveling feet · seismic anchors
Materials
6063-T6 · 6005A-T6 · A380 aluminum · Zamak zinc
The Spec That Matters
±0.4 mm cumulative U-position accuracy over 42U, against a 1.3 mm/m extrusion standard.
Rittal · Panduit · Chatsworth Products · nVent · Great Lakes · Legrand
INDUSTRIAL & COMMERCIAL DISTRIBUTION
Switchboards, panelboards and busway outside the data center. Same joints, longer runs.
Components
Conductor bar · splice plates · plug-in contacts · end feed and elbow bodies · breaker pans · neutral and ground bus
Materials
C11000 copper · 6101-T6 aluminum · A380 aluminum
The Spec That Matters
creep management on aluminum joints — belleville hardware specified on the assembly.
Eaton · Schneider Electric · Siemens · ABB · Powell Industries · Myers Power Products
Battery cabinet interconnect uses the same machined and plated copper.
What We Can Hold
What we hold and where the limits are. If your part sits outside this, send it anyway.
01
Busbar & Conductors
Standard Specifications
- Copper bar thickness 3 mm to 25 mm
- Copper bar width 20 mm to 250 mm
- Edge condition 0.4 mm break, burr-free, specified separately
- Hole position tolerance ±0.10 mm
- Tin plating 5 to 15 µm at the joint face
- Voltage class served 600 V to 38 kV
02
Extrusion, Casting & Enclosure
Standard Specifications
- Extruded length up to 6 m · precision straightened to 0.5 mm/m
- Extrusion wall, minimum 1.2 mm on 6063 · 1.5 mm on 6005A
- U-position accuracy, rack rail ±0.4 mm cumulative over 42U
- Die cast wall, minimum 1.5 mm aluminum · 0.8 mm zinc
- Investment casting 10 g to 50 kg · ±0.13 mm on the first 25 mm
- Annual volume 500 to 500,000 pieces per part number
How We Prove It Before It Ships
Every number on the drawing has to be measured by someone, somewhere. We do it in the supplier's plant, on the parts that ship — not on your dock, and not on a first article that was made under conditions the production run will never see.
Here is what that looks like in practice.
Lead Times
3 to 5 business days
Quote turnaround
on a complete drawing package
5 business days
DFM feedback
before tooling · no cost
2 to 4 weeks
Prototype, machined busbar
6 to 10 weeks
Extrusion die
8 to 16 weeks
Hard tooling, die cast
2 to 3 weeks
First article inspection
from tool approval
6 to 10 weeks
Production, tooled part
2 to 5 days
From stock
from Columbus, Monterrey or Poland
Four Assemblies.
Precision CNC machining, aluminum extrusion, high-pressure die casting and forging.
Busway & Busbar
Three requirements get under-specified: plating with a standard and a test location, flatness at the joint, and alloy designation where conductivity matters.
Part by Part
Copper conductor bar
CNC machined C11000, 100% IACS — 3 to 25 mm thick, to 250 mm wide
Aluminum conductor bar
Extruded 6101-T6, machined at joint faces — 55 to 57% IACS
Busway housing sections
6063-T6 extrusion to 6 m, straightened 0.5 mm/m
Joint block and splice plate
Machined copper or aluminum — 0.05 mm flatness at the joint
Bus stab and plug-in contact
Machined, 5 to 13 µm silver or 5 to 15 µm tin plated
Tap-off box housing
A380 die cast — 1.5 mm minimum wall
End feed and elbow bodies
Cast and machined
Hanger and seismic support brackets
Stamped and machined
UPS Systems
Each modular bay is a dense stack of power electronics. Heat sink flatness under the power module is the specification most often missed.
Part by Part
Enclosure frame and panels
Extruded and machined aluminum
DC link busbar
CNC machined C11000, plated — 3 to 16 mm thick
AC input and output busbar
CNC machined C11000, plated
IGBT heat sink base
Extruded then machined to 0.05 mm flatness, 0.8 µm Ra
Capacitor mounting bracket
A380 die cast and machined
Module chassis and hot-swap rails
Extruded and machined — 50 insertion cycles
Cable gland plate
CNC machined aluminum
Terminal lugs and connector bodies
Forged and machined, certified per heat
Power Distribution Units
Floor-mount, rack-mount and remote power panels draw on the same families. Straightness across a two-meter body is the spec most often left to the standard.
Part by Part
Floor-mount enclosure frame and panels
Extruded and machined aluminum
Rack PDU body
6063-T6 extrusion to 2,200 mm, straightened 0.5 mm/m
Outlet strip extrusion
Custom profile, 1.2 mm minimum wall
Main and branch bus assembly
CNC machined copper, plated
Breaker mounting pan
Die cast and machined — ±0.10 mm hole position
Neutral and ground bus
Machined copper, UL 467 where required
Metering panel frame
CNC machined
Door, hinge and latch hardware
Zinc die cast, 10,000 cycle rated
Rack & Enclosure
Extruded aluminum with cast and stamped hardware. U-position accuracy over a two-meter rail decides whether equipment mounts without shimming.
Part by Part
Rack frame and mounting rails
6063 extrusion — ±0.4 mm cumulative over 42U
Structural brackets and gussets
Die cast and stamped
Cable management arms and trays
Extruded and stamped
Blanking panels and airflow seals
Stamped
Leveling feet and casters
Machined
Seismic anchors and base hardware
Forged, certified per heat
Door frames, hinges and locks
Zinc die cast
What Engineers Ask Us About Busbar Manufacturing
Five specifications decide whether a bus joint survives thirty years of thermal cycling. All five are set on the drawing.
6101-T6 runs 55 to 57% IACS. 6063-T6 runs roughly 53% and is intended for housings and framing. Substituting it costs ampacity you have to recover by increasing cross-section. Write the alloy and temper on the drawing.
Tin at 5 to 15 µm resists corrosion and adds contact resistance. Silver at 5 to 13 µm conducts better and galls under torque if thin. Specify a thickness, a standard and where it is measured — plating on the flat is not plating at the joint face.
The joint conducts through the area that actually touches. A bar bowed 0.2 mm across a 60 mm joint face contacts a fraction of its nominal area, and the resistance rise shows up as heat. Specify 0.05 mm flatness and edge condition at the joint, and state where it is measured.
Aluminum creeps under sustained bolt load and thermal cycling. A joint torqued at commissioning relaxes unless belleville washers maintain the load. Specified on the assembly rather than the component — but it decides whether the component performs.
Any deviation in the heat sink face leaves a gap the TIM has to fill, and TIM conducts far worse than aluminum. Specify 0.05 mm flatness under the module footprint and 0.8 µm Ra with it, verified across the lot. Flat but rough, or smooth but bowed, both raise junction temperature.
Conductivity of 6101-T6, the busbar alloy most often substituted wrong.
Silver plating thickness, measured at the joint face.
Copper or Aluminum Busbar?
Both are in production. The choice comes down to ampacity per unit area, weight and how the joints will be maintained.
C11000 Copper
100% IACS, carrying roughly 1.7 times the current of aluminum at the same cross-section. 8.9 g/cm³. Stable bolted joints with conventional hardware.
Materially more expensive and dutied on full customs value since April 2026.
6101-T6 Aluminum
55 to 57% IACS, so it needs roughly 1.6 times the cross-section for the same ampacity. 2.7 g/cm³ and cheaper per amp, which matters on long overhead runs.
Joints creep and need belleville hardware.
The Rule
Copper where space is constrained or maintenance access is poor. Aluminum on long runs where weight and cost dominate. MES machines copper and extrudes aluminum, so the decision can be made on engineering grounds.
Where We Are Not the Right Answer
The fastest way to be believed about what we can do is to be specific about what we cannot.
Domestic melt and pour. If your specification requires it, a domestic mill wins and we should not be in the conversation.
ITAR-controlled work and DFARS specialty metal restrictions. Not our lane.
NQA-1 nuclear programs. The qualification burden is real and we do not carry it.
Insulation systems, epoxy coating and encapsulation. We machine and plate the conductor. The dielectric system comes from you or a specialist.
Breakers, meters, relays and monitoring. OEM-supplied.
Volumes under 500 pieces a year on a hard-tooled part.
Five Processes. One Partner.
CNC Machining
Copper busbar, bus stabs, joint blocks, heat sink bases. ±0.05 mm general, ±0.013 mm critical, ±0.10 mm hole position, 0.4 µm Ra achievable.
Aluminum Extrusion
Busway housings, PDU bodies, rack framing, 6101 conductor. To 300 mm circumscribing circle, 6 m lengths, 1.2 mm minimum wall, straightened 0.5 mm/m.
High-Pressure Die Casting
Tap-off boxes, breaker pans, capacitor brackets. 50 to 4,400 tons, 5 g to 40 kg, 1.5 mm minimum wall aluminum, 0.8 mm zinc.
Forging
Terminal lugs, connector bodies, seismic anchors. 50 to 4,400 tons, certified per heat lot.
Investment Casting
Contact carriers and complex small parts. 10 g to 50 kg, ±0.13 mm on the first 25 mm.
Materials
C11000 Copper
- 100% IACS
- 8.9 g/cm³
- 3 to 25 mm bar
- Tin or silver plated at the joint face
6101-T6 Aluminum
- 55 to 57% IACS
- 2.7 g/cm³
- Needs 1.6× cross-section for equal ampacity
- Requires creep management
6063-T6 & 6005A Aluminum
- Housings, PDU bodies, framing
- 1.2 mm minimum wall
- Neither is a conductor substitute
A380 Aluminum & Zamak Zinc
- Tap-off boxes, breaker pans, brackets
- 1.5 mm and 0.8 mm minimum wall
- EMI shielding
- 10,000 cycle door hardware
Built for Energization Dates
01 Global network
Engineering and quality staff employed in eight countries. 250+ qualified suppliers, 3,000+ audited.
02 Warehousing and JIT
Columbus, Monterrey and Poland. 2 to 5 days to your dock, min-max or consignment.
03 Quality
First article on 100% of features. CMM at source. 5 pieces per lot on joint faces. Plating verified by XRF at the contact face.
04 Consolidation
One contact and one planner per account, replacing a dozen supplier relationships.
Proof in Production
Real programs, real constraints, and what it took to hold the date.
Precision conductors for Eaton's medium-voltage vacuum circuit breakers
When a sudden manufacturing shutdown hit Eaton's VCP-W program, MES qualified replacement supply and cleared a backlog of nearly one thousand parts in under eight months — taking annual output from 3,000 units to more than 40,000. High-tonnage aluminum die castings with selective tin and silver plating, nearsourced to a partner in Eaton's own backyard.
Read Case StudyEaton: 20+ global locations, one managed inventory program
Eaton operates in more than 170 countries. MES runs a fully managed inventory program across twenty-plus of their facilities.
Read Case StudyAcuity Brands: twelve weeks of inventory eliminated
Right component, qualified supplier, tooling dialed in — and twelve weeks of inventory behind it. MES restructured the program and released the working capital.
Read Case StudyLet's Build the Power Chain Behind AI
Scaling busway production, sourcing UPS enclosure content, or qualifying a second source for machined copper — MES delivers the components and the supply chain to get there faster.