A DIN-rail family prefix is a catalog locator, not a substitute-approval rule. Read the complete NDR, DR or EDR model, its specific output row, applicable input conditions and order-linked drawing before accepting a replacement. A shared “24” suffix does not make two supplies electrically or mechanically interchangeable.
Start with the complete identifier, not the family nickname
An equipment builder may receive a quotation for “a DR supply” while the maintenance record says only “24 V.” Neither description uniquely identifies the component. WEHO lists DR, NDR and EDR as separate DIN-rail product families. The useful purchasing record is the complete printed identifier together with the document revision and the actual sample photograph.
For the unit illustrated here, that identifier is EDR-150 - 24 (edizione). Its authentic nameplate identifies a 24 V, 6.5 A output and a 200–240VAC input. The supported example in this article uses the documented 230 VAC input condition. The suffix “24” is consistent with the corresponding output-voltage row; it does not encode the current limit, permitted ambient temperature, terminal arrangement or approvals.
A number inside the name is not every variant’s power rating
IL DR-60 family table demonstrates why a prefix-and-number shortcut is inadequate. It lists a 5 V variant at 6.5 A, a 12 V variant at 4.5 A, and the 24 V variant at 2.5 A. The listed power values are therefore not identical across all variants carrying “DR-60.” Select the exact row, not an assumed rating taken from the family label.
Likewise, a model’s input condition can matter to the available output. The retained complete EDR-150 specification separates a 24 V output-current row at 115 VAC from its row at 230 VAC. A purchasing description that copies a higher current without its input condition loses information even when the full model number is correct. This is a reason to attach the applicable specification, not a recommendation to operate the illustrated EDR unit under another family’s conditions.
| Example full identifier | What the name helps you find | What still requires its own evidence |
|---|---|---|
| DR-60-24 | DR-60 family, corresponding 24 V variant | Specific current row, sample markings, applicable pin map and installation limits |
| NDR-75-24 | NDR-75 family, corresponding 24 V variant | Exact specification revision, terminal layout and mechanical envelope |
| EDR-150 - 24 (edizione) | EDR-150 family, corresponding 24 V variant | Output conditions at the actual input, order-linked drawing and acceptance criteria |
Common voltage does not approve a cross-family replacement
WEHO’s NDR-75 E EDR-150 pages also include 24 V models. That common voltage is only one comparison field. A replacement review must still close the actual load budget, startup behavior, protective coordination, input supply, installation environment and mechanical fit. The letters themselves do not prove that one family is universally better, equivalent or suitable for a particular machine.
Do not expand NDR, DR or EDR into an invented universal acronym meaning. Use the names exactly as WEHO publishes them. Descriptions such as “economical” on an individual product page are not a cross-family quality ranking or evidence that a particular substitute has been tested in your equipment.
Record the actual sample and the applicable drawing together
The illustrated EDR-150-24 has a narrow blue printed front and silver metal enclosure, with four upper output positions and three lower input/earth positions. Its complete mechanical drawing supports a 40 mm front width, 125.2 mm upright height and 113.5 mm front-to-rear depth, with actual rear DIN-rail mounting evidence. These facts identify this sample; they are not dimensions for every DR, NDR or EDR unit.
A receiving inspection should associate the sample with the order, full model, serial or lot identification, supplied specification and accepted drawing. Keep nominal nameplate information separate from the stated operating range. This authentic EDR sample is marked 200–240VAC and 50/60Hz; the retained family sheet and current product page state broader operating ranges with different boundaries. The illustrated branch therefore remains at the common documented 230 VAC condition. Do not turn different operating statements into a newly edited nameplate.
An unresolved difference must remain visible in the review record. A separately retained DR-60-24 sample provides a useful counterexample: its physical DC legends group the left output pair as −V and the right pair as +V, while its generic numbered pin table assigns those groups differently. That DR sample was excluded from the application-image selection rather than connected by guesswork. The EDR sample used in the scenes has source-consistent terminal evidence. Obtain the order-applicable wiring drawing and reconcile it with the supplied unit before electrical termination; a family nickname does not resolve a revision discrepancy.
Use a substitution record that preserves the boundary
For an OEM bill of materials, retain the old and proposed full identifiers in separate fields. Add the accepted document revisions, actual input conditions, output requirements, mounting envelope and terminal mapping. Mark an unresolved field as pending rather than treating a matching suffix as approval. If a sample does not match the accepted documentation, the correct next step is supplier clarification and an updated controlled record—not a visual or editorial rewrite that conceals the mismatch.
This naming guide stops at identifying the right evidence. It does not certify a substitute, recommend live adjustment or supply a machine-specific current budget. Qualified personnel must complete the electrical and safety acceptance for the actual order and installation.
Frequently asked questions
Can I replace any DR supply with an NDR model of the same voltage?
No. Equal nominal voltage does not establish current capability, electrical behavior, terminal mapping or installation fit. Review the two complete models and their applicable documents.
Does “60” mean every DR-60 variant supplies 60 W?
No. Use the full-model row; the public family table includes variants with different listed powers.
Does “24” identify all the installation requirements?
No. For these example identifiers it corresponds to the voltage variant, not a complete application or approval code.
Which source should I use when the sample and generic pin table disagree?
Neither disagreement should be ignored. Request and accept the wiring document applicable to the actual order before connecting conductors. Preserve the genuine sample image and the discrepancy record.
Are the two scene images real customer installations?
No. They are source-referenced technical illustrations of conditional 230 VAC to 24 V auxiliary-control installations. They do not prove a tested load, customer approval or an electrically energized photograph.
