Last Updated: October 7, 2026
Quick Answer: A power supply price is meaningful only when the quotations cover the same output, input arrangement, enclosure, mounting, documentation and delivery scope. Define the equipment requirements and the exact ordered model before comparing suppliers. WEHO S-60-24 provides a documented 24V, 2.5A enclosed example for discussing this process; it is not a universal substitute for every 24V load, and this guide does not invent a unit price or component-cost breakdown.
A low number on a quotation can look attractive while leaving engineering work, accessories, transport arrangements or revision questions outside the offer. Conversely, a higher quotation may cover a different specification rather than a more expensive version of the same product. An OEM buyer needs a common comparison basis before deciding which difference deserves negotiation and which difference changes the design.
This guide explains how to prepare that basis. It separates the supply itself from the equipment around it, turns an informal request into a controlled bill-of-materials entry, and gives procurement and engineering different but connected responsibilities. The purpose is to make commercial comparisons usable, not to claim that any one feature accounts for a fixed share of manufacturing cost.
Start with an equipment requirement, not a target purchase price
A target budget helps a purchasing team plan, but it cannot identify a suitable power supply on its own. The engineering request should first describe the required DC output, the equipment’s input supply, the installation space and the operating conditions that matter to the design. The purchaser can then ask for an exact model and an explicitly stated offer scope.
Separate confirmed requirements from questions that still need resolution. For example, “24V output” does not establish the necessary continuous current, start-up demand, regulation tolerance or behavior during an abnormal condition. A photograph of a machine display does not establish its electrical consumption. Those values must come from the actual equipment design and load documentation, not from a convenient product rating.
The same discipline applies to the enclosure. An enclosed metal supply installed inside equipment is a component of that equipment; its casing is not evidence that the whole installation meets an environmental requirement. Record where the component will sit, what surrounding protection is provided, and who is responsible for assessing the finished assembly. Otherwise a price comparison can accidentally mix different responsibilities.
A useful RFQ therefore includes a requirements sheet, a model identifier and a list of open questions. If a requirement is unknown, identify its owner and the evidence needed to close it. Do not silently assign it a value simply to obtain a faster quotation.
Use the S-60-24 as a bounded BOM example
The official WEHO S-60 page lists S-60-24 at 24V and up to 2.5A, with an overall 159 × 98 × 38mm envelope. It describes an enclosed single-output supply with free-air-convection cooling and mentions LED-strip, screen-lighting and monitor applications. The corresponding approved complete specification includes the electrical table and mechanical drawing.
These facts give an OEM team a concrete starting point: a nominal 60W, 24V enclosed component with a documented physical interface. They do not demonstrate that a particular sign, display or machine can be powered by it. That decision still depends on the real load, input arrangement, installation and relevant equipment checks.
The photographed specimen has a physical input label reading 100–120VAC at 1.4A, 200–240VAC at 0.7A and 50/60Hz. The family specification separately states switch-selected 90–132VAC or 180–264VAC and 47–63Hz. Preserve these as distinct source statements. Before relying on the broader family window for an order, ask WEHO to confirm the supplied revision and its applicable specification; do not rewrite the specimen’s label into catalog text.
The mechanical drawing also distinguishes the overall 159mm length from shorter casing spans. That distinction matters when an equipment designer places the terminal end near a service opening. Use the overall envelope for initial space allocation and the complete drawing for mounting details. Do not substitute a shorter sheet-metal dimension because it makes the proposed fit look easier.
What can change a power supply price comparison?
Several factors can change the scope of an offer. None should be assigned a fabricated cost percentage.
The first is the electrical requirement. Different outputs, current ratings or input arrangements may identify different ordered products. A buyer comparing only wattage can miss a voltage or interface difference that prevents interchangeability. Engineering should confirm the exact option before procurement treats two offers as equivalent.
The second is physical integration. A supply requiring a different attachment, terminal-access arrangement or enclosure layout can create additional work elsewhere in the equipment. This does not prove the supply itself has a higher manufacturing cost. It means the component price and the integration cost are separate decision items.
The third is the evidence requested with the order. A quotation may need a particular revision record, inspection document, sample evaluation arrangement or agreed identification method. Specify what is required and ask whether it is included, available separately or subject to another agreement. Do not assume the same document package is included in every offer.
The fourth is the commercial order scope: quantity, packaging, delivery arrangement and the services actually offered. Obtain written terms for the specific request. Avoid comparing a sample offer with a production offer, or an offer covering only the component with another that includes a broader delivery scope.
Finally, changes to an existing equipment design deserve their own line of discussion. A nominally cheaper alternative may require another mechanical review or load evaluation. Record that work as a project consideration without presenting an invented payback period or claiming that the more expensive supply will automatically avoid it.
Build a BOM entry that different suppliers can quote consistently
A controlled BOM entry starts with the exact full model, not a family nickname. In this example, S-60-24 identifies the 24V option. “S series,” “60W supply” and “24V power” are not sufficiently precise identifiers for an order intended to match an approved component.
Add the required output and the approved input arrangement. State the drawing and specification revision being used, and identify any unresolved difference between the specimen and family documentation. This gives the supplier an opportunity to confirm the offer rather than leaving the buyer to infer compatibility from a product-page headline.
Record the physical installation boundary. The S-60 source drawing documents chassis mounting, not a DIN-rail product. An RFQ that assumes a rail clip would change the attachment concept and introduce an unsupported accessory requirement. Keep such a requirement separate and resolve it explicitly instead of showing the supply mounted on a rail in the equipment plan.
Include the services and records that the purchase needs. A simple “documentation included” note is often too broad: identify the actual record required, who receives it and how it is associated with the supplied revision. The same principle applies to packaging and delivery details. A precise request is easier to price and easier to check against the eventual offer.
| Comparison item | Put in the request | Confirm in the offer |
|---|---|---|
| Product identity | Exact full model and required option | The same ordered model, not a family substitute |
| Electrical basis | Required output and approved input arrangement | Applicable revision and unresolved differences |
| Mechanical interface | Complete drawing and installation concept | Supplied form factor and attachment scope |
| Evidence package | Specific records required by the project | Included records and any separate arrangements |
| Order scope | Quantity, packaging and requested delivery basis | Written scope, exclusions and offer validity |
The table is a comparison framework, not a statement that WEHO includes every listed service as standard. Only the actual written quotation establishes what a particular offer covers.
Keep component cost separate from installed-equipment cost
Procurement can maintain two linked views. The first contains the supplier’s actual component offer. The second contains the equipment work needed to integrate the selected component. Keeping them separate prevents a speculative project estimate from being mistaken for a supplier’s price breakdown.
For an indoor lightbox, the installation discussion may include available space, access to the terminal end and the surrounding equipment enclosure. For a machine monitor compartment, it may instead emphasize access within an electronics bay and coordination with the display assembly. These are different equipment contexts; neither context establishes a load value or proves a completed installation.
The S-60-24 photographs in this guide illustrate mechanical integration during an isolated service or precommissioning state. They do not show a validated energized circuit. The source-empty contacts remain visible, and no nearby cable is represented as an established load connection. A component image helps explain layout; it cannot replace the actual electrical design or commissioning record.
This distinction protects the price comparison from false precision. The supply’s physical envelope can be documented, but the time required to alter a particular cabinet cannot be inferred from that envelope alone. Obtain the relevant project estimate from the team doing the work, and state its assumptions separately from the component offer.
Make quotation differences actionable
When two offers differ, ask what causes the difference before trying to negotiate the number. The answer may be a different output option, another order quantity, an excluded document, or a delivery arrangement that is not the same. A comparison sheet should identify the difference and its owner rather than immediately labeling one supplier expensive.
Classify each item as an engineering question, a commercial clarification or an agreed project requirement. An input-revision question belongs with engineering and the supplier. Packaging or offer-validity clarification belongs with procurement. A change to the required component should be approved through the equipment’s change process before anyone orders it as a cost-saving substitute.
Request a corrected or clarified offer when the identifiers do not match. A handwritten note that “equivalent model accepted” is not a substitute for a controlled decision when the attachment, rating or applicable revision changes. Preserve the supplier’s confirmation with the comparison so the reason for accepting the offer remains understandable later.
Do not turn the lowest price into an automatic decision rule. Equally, do not assume a higher price proves better quality, reliability or support. Those judgments need their own evidence. Commercial evaluation is strongest when it follows a technically defined request and uses the actual terms of the offer.
Avoid false cost breakdowns and unsupported savings claims
A public product specification does not reveal the supplier’s manufacturing BOM, purchasing costs or margin. It is therefore inappropriate to assign a percentage of the price to the enclosure, transformer, controls or inspection without a substantiated cost model. This article does not make those claims.
Similarly, there is no universal price per watt that determines whether this model is economical for a project. A larger rating may be unsuitable for the space or interface, and a smaller rating may be unsuitable for the actual load. Compare qualified alternatives against the same requirements; do not replace qualification with a simple cost-per-watt ratio.
For a planned cost reduction, state what is being changed and what evidence must be revisited. If only the commercial offer changes while the exact approved product remains the same, the technical scope may be unchanged. If the model, revision or installation changes, record that change separately and assess the affected requirements before accepting the saving.
The disciplined approach is not slower purchasing for its own sake. It reduces the number of unresolved assumptions hidden inside a quotation and makes subsequent engineering and commercial decisions easier to explain.
A practical handover between engineering, procurement and production
Engineering owns the technical requirement and the reasons the selected component fits the proposed design. Procurement owns the comparable quotation scope and the supplier’s written clarifications. Production needs the exact identification and controlled installation information required for the equipment it will build.
Connect these responsibilities with one common component record. The record should point to the applicable specification and drawing, the approved full-model identifier, the quotation being evaluated and any open question. Avoid maintaining independent model descriptions in different spreadsheets that gradually drift apart.
When a sample is available, compare its identification with the requested revision and resolve any discrepancy before treating it as the production-order reference. For the S-60-24 example, that includes retaining the literal physical label rather than assuming the family operating range has been printed on every specimen.
At handover, make the decision explicit: what was accepted, what remains conditional, and who closes the remaining question. This is more useful than a general “best price approved” note. It also gives a later purchasing team a clear starting point if it needs another quotation.
Key Takeaways
- Define the exact electrical, mechanical and order scope before comparing a power supply price.
- Use S-60-24 as a documented 24V, 2.5A enclosed example, not proof of suitability for an unidentified load.
- Keep the photographed input label separate from the family operating range and confirm the ordered revision.
- Compare the component offer and equipment integration work in linked but separate records.
- Request written clarification of differences; do not invent unit prices, manufacturing cost shares or savings percentages.
Conclusion
A defensible power supply price comparison starts with a common requirement and ends with a clearly documented offer scope. The lowest number is not automatically the lowest installed-equipment cost, and a higher number is not automatically evidence of a better product. Precise identification makes those differences visible.
For an OEM considering S-60-24, begin with the documented 24V, 2.5A output, complete mechanical interface and revision-specific input confirmation. Then ask WEHO for a quotation tied to that request. Procurement can negotiate an actual offer while engineering retains control of the component’s fit, without turning incomplete product information into a fabricated price breakdown.
Frequently Asked Questions
What affects a power supply price comparison?
The exact output option, approved input arrangement, mechanical interface, requested records and written order scope can differ between offers. Compare the same requirement rather than assigning an invented percentage of the price to individual parts.
Does a 60W rating prove S-60-24 fits my equipment?
No. S-60-24 is a documented24V2.5A enclosed example. Suitability still depends on the actual load, input revision, installation and equipment requirements; an application photograph does not establish these values.
Why should I specify the full model in an RFQ?
A family name or wattage can leave the output option and physical interface ambiguous. Include the full model, applicable specification/drawing and unresolved revision questions so the supplier can confirm a comparable offer.
Can the physical input label be replaced by the broader family range?
No. The photographed100–120VAC1.4A/200–240VAC0.7A50/60Hz label and the family’s switch-selected90–132/180–264VAC47–63Hz table are distinct statements. Confirm the supplied revision before relying on the wider window.
Is S-60-24 a DIN-rail power supply?
The reviewed complete drawing supports chassis mounting, not a DIN-rail clip. Keep any proposed different attachment or accessory requirement separate and resolve it rather than treating it as included.
Does this guide provide a WEHO unit price or BOM cost percentage?
No. Ask WEHO for a written quotation tied to the required model, quantity, records and delivery scope. Public technical specifications do not establish manufacturing cost shares, margins or a universal price per watt.
