MKT-01 / CONTROLS Grayscale photo — control panel or cabinet interior
Industrial controls
Panel-mount HMIs, enclosures and control boxes for equipment that runs a production floor.
Box build orchestration
Your BOM ends here. One box. One owner.
Enclosures, PCBAs, displays and cabling fabricated across a named Taiwan supplier network — then kitted, assembled, tested and documented on our own floor.
Most OEMs end up managing six vendors, four time zones and one language barrier to get a finished unit. Essen sits in the middle of that and hands you a single point of accountability, a single schedule, and a single invoice.
20+ yrs per engineer
3 generations in TW electronics
US principal · TW floor
Our team's work has shipped for
Image 01 Drawing review at the bench 1920 × 1200 · 16:10 · /images/stage-01-scope.jpg
STG-01 / SCOPE
01 · Scope & BOM review
Before a single part moves.
Send the BOM, the mechanical drawings and whatever assembly notes exist — even if they're incomplete. Our engineers read them the way the factory will read them, and come back with the questions the drawings don't answer.
You get a written scope covering what we build, what you supply, what's still undecided, and where we think the cost actually sits. Most of the expensive surprises in a box build are visible at this stage if somebody bothers to look.
- Drawing and BOM reviewTolerances, finishes and fit checked against what the fabrication network can actually hold
- Open-question listEvery ambiguity written down and resolved before quoting, not during production
- Make-vs-buy splitClear line between what we source, what we assemble, and what stays with you
Image 02 Sourced sub-assemblies 1920 × 1200 · 16:10 · /images/stage-02-sourcing.jpg
STG-02 / SOURCING
02 · Supplier selection
The network, not a catalogue.
Enclosures, PCBAs, displays, membrane switches and cable assemblies each come from the shop that's genuinely good at them. We've worked with these facilities for years and we know which ones hold tolerance, which ones answer the phone in August, and which ones to keep away from your program.
You see who is making what. We don't hide the supply chain behind a markup — you get named facilities, their certifications, and the reason each one was chosen.
- Named facilitiesYou know which shop builds which sub-assembly, and why
- Certification transparencyISO and other certifications sit with the fabrication facilities — we show you whose, not ours
- Second-source planningBackup identified for any single-source line item before production starts
- Landed costTooling, freight and duty priced up front, not discovered later
Image 03 Kits staged per unit 1920 × 1200 · 16:10 · /images/stage-03-kitting.jpg
STG-03 / KITTING
03 · Kitting & inbound QC
Everything lands in one place.
Parts arrive from multiple suppliers into our facility, get inspected against the drawing, and get kitted per unit. Anything out of spec goes back to the supplier before it reaches the assembly bench — not after it's already inside a sealed enclosure.
You can consign your own components into the same kit. Customer-supplied parts are received, counted and tracked alongside everything we source.
- Inbound inspectionDimensional and visual check against the released drawing revision
- Per-unit kittingEvery unit's parts staged together, so shortages surface early
- Consigned materialShip us your own components and we'll fold them into the kit
- Supplier chargebackRejected parts go back to the source, not into your schedule
Image 04 Final integration 1920 × 1200 · 16:10 · /images/stage-04-assembly.jpg
STG-04 / ASSEMBLY
04 · Final assembly
Built in-house, on purpose.
Sourcing is a network. Assembly is not. Final integration happens on our own floor with our own people, because that's the step where a box build either comes together cleanly or turns into a warranty problem.
First article gets built and signed off before the run starts. Once you approve it, that unit becomes the reference every subsequent build is measured against.
- First article approvalYou approve a physical unit before volume begins
- Documented work instructionsPhotographed, step-by-step, so build two matches build two hundred
- Torque and routing controlFastener torque, harness routing and strain relief specified, not improvised
- In-house accountabilityIf something's wrong in the box, it's ours to fix
Image 05 Functional test fixture 1920 × 1200 · 16:10 · /images/stage-05-test.jpg
STG-05 / TEST
05 · Test & documentation
Proof, not assurances.
Every unit is functionally tested to the procedure we agree with you before the run. If you have an existing test fixture or script, we'll use it. If you don't, we'll write one against your acceptance criteria and you approve it.
Results travel with the shipment. You get the records, the serial traceability and the photographs — the things you'll actually need when a unit comes back from the field eighteen months from now.
- Functional test per unitTo an agreed, written procedure — no unit ships untested
- Your fixture or oursBring an existing test setup, or we'll build to your acceptance criteria
- Serial traceabilityEach unit traceable back to its kit and supplier lots
- Records with the shipmentTest data and photographs delivered, not held
Image 06 Packed for the route 1920 × 1200 · 16:10 · /images/stage-06-ship.jpg
STG-06 / SHIP
06 · Ship & sustain
The second order is the real test.
Units ship packed to survive the route they're actually taking. Then the program continues: revisions get documented, suppliers get re-qualified when a part goes end-of-life, and the build stays reproducible after the first run is behind you.
You keep the same point of contact throughout. There's no handoff from a sales team to an account team to a factory you've never spoken to.
- Packaging for the routeSpecified for ocean, air or drop-ship, including retail-ready if you need it
- Revision controlChanges documented against the approved first article
- EOL monitoringObsolete parts flagged and re-qualified before they stop your line
- One contactSame person from first quote through reorder
Markets we build for
Built for hardware that has to keep working.
Box build is the same discipline across industries: hold the tolerance, document the build, make the second run match the first. These are the product types our team has spent careers on.
MKT-02 / IOT Grayscale photo — sealed gateway or edge device
Industrial IoT & edge
Sealed gateway and sensor boxes — board, radio, antenna and power in an enclosure that survives the site.
MKT-03 / TEST Grayscale photo — instrument front panel, close crop
Test & measurement
Instrument housings and front panels for products whose whole job is being accurate.
MKT-04 / KIOSK Grayscale photo — terminal or kiosk in situ
Kiosk & self-service
Ruggedised terminals combining display, interface and enclosure into one serviceable unit.
Common questions
What OEMs ask us first.
Box build — sometimes called systems integration — is everything beyond the bare circuit board. It covers the enclosure, the wire harnesses, the display and interface, the fasteners and labelling, and the final integration and test that turns a set of components into a finished, shippable product.
Our fabrication partners hold their own certifications, including ISO 9001, and we provide the current certificates for whichever facilities are building your product. Essen operates as the orchestrator and final assembler — we're transparent that the certifications sit with the shops doing the fabrication rather than being held in our name.
Minimums depend on the sub-assemblies involved — tooled parts like injection-moulded enclosures carry different economics than sheet metal or cable assemblies. We'll tell you the real minimum for your specific build during the scope review rather than quoting a blanket number.
We quote landed cost, not factory-gate cost. That means tooling, freight, duty and applicable tariffs are included in the number you see, so procurement isn't reconciling four separate figures later. If duty rates change mid-program, we flag it.
Yes. Consigned material is common — many customers have existing supplier relationships or long-lead parts already on order. Ship them to us and we'll receive, count, inspect and kit them alongside everything we source.
Lead time is driven by the longest-lead sub-assembly, usually tooling or a custom display. We give you a stage-by-stage schedule with the critical path identified during scope review, so you know which item is setting the date and where the risk sits.
An American principal, in English, in your time zone — with direct access to the engineers on the assembly floor in Taiwan. Removing the language and time-zone gap between an American OEM and an Asian supply base is a large part of what we do.
Always, and before anything is shared. Send us your NDA or we'll send ours. Drawings and BOMs are only distributed to the specific partner facilities quoting your work, and only after that agreement is in place.
Send the BOM. We'll tell you what's missing.
No obligation and no sales sequence. Send a bill of materials and drawings and you'll get back a written scope, an open-question list, and an honest view of where the cost really sits — from Christopher, within one business day.