Choosing a DIN-rail or chassis power supply for a retrofit is a maintenance and integration decision, not simply a comparison of two mounting accessories. The existing machine determines the available support plane, cable access, enclosure boundaries and replacement procedure. A familiar output voltage does not make a different mechanical format interchangeable.
This guide uses the source-qualified WEHO LRS-35-24 as a chassis-mount example. A separately specified DIN-rail supply would follow its own documented mounting method. The LRS sample is not a DIN product: adding a rail beneath it in an illustration or a purchasing sketch does not establish an approved adapter.
Start with the existing machine, not the preferred format
Record how the current supply is supported and serviced. Identify the actual mounting plane, access direction, conductor routes and enclosure separations. A rail-mounted unit in a deep control cabinet and a shallow supply inside a withdrawable service cassette create different replacement tasks, even when both provide the same nominal rail.
Ask who will remove the supply, which adjacent components must remain undisturbed, and whether the harness can be identified and disconnected without changing its accepted route. Do not treat an empty rectangle on a cabinet drawing as sufficient space: terminal access, the cover, fastening tools and the removal path also matter.
Conditional laboratory-centrifuge service-drawer illustration: the chassis supply belongs to a protected dry electronics compartment, separate from the rotor and motor section. The example shows a candidate installation arrangement for a defined 24 V electronics branch, not centrifuge-drive compatibility or a completed powered acceptance test.
Describe the actual chassis candidate in three axes
IL official WEHO LRS-35 product page, authentic full-model photograph and retained mechanical sheet support the LRS-35-24 example’s nominal 24 V, 1.5 A output. Its documented enclosure is 82 mm across the terminal edge, 99 mm front-to-rear and 30 mm high. Keep the axes explicit: a low height does not eliminate the depth needed behind the terminal strip.
The actual photographed label states 100–240 VAC, 0.74 A, 50/60 Hz. Broader family input information and inconsistent public temperature wording are not silently substituted for that specimen record. Obtain the accepted installation and operating envelope for the delivered revision before choosing it for the site’s supply and enclosure.
Its shallow metal chassis, ventilated honeycomb cover, clear five-position terminal guard, green indicator and white adjustment control are physical evidence. They are not proof of a particular temperature rise, permissible installed orientation, protective-device behavior or certification of the machine.
Make the fastening choice explicit
The complete drawing identifies bottom and side M3 fixing choices. The indicated maximum screw penetration is 3.0 mm for the bottom fixing E 5 mm for the side fixing; these are different limits for different locations, not interchangeable values. The actual attachment design must also establish the chassis support, access and correct fastener engagement. An illustration cannot verify a hidden screw length.
For a chassis retrofit, the designer must preserve the documented housing and fastening arrangement. Do not add product ears, feet, a clip or a strap around the ventilated case merely to resemble the existing installation. Any proposed adapter requires its own accepted design and supplier confirmation; this article does not approve one.
A DIN alternative has a different interface: the exact candidate’s documented rail type, latch, orientation, clearance and removal access must be checked. Do not transfer one family’s mounting detail to another or assume the rail is adequate because another module is already fitted to it.
| Retrofit decision | Chassis candidate | Separately specified DIN candidate |
|---|---|---|
| Supporto | Accepted base or side fixing and support plane | Accepted rail and exact rear engagement |
| Removal | Tool and cassette/plate access | Latch and withdrawal access |
| Harness | Real front clamp access and strain restraint | The exact candidate’s documented conductor entries |
| Envelope | All three casing axes plus service route | Full installed depth, not front width alone |
| Release | Defined machine and revision acceptance | Independent acceptance for that candidate |
Automatic screwdriving-station mechanical-fit illustration before conductor termination: the technician checks a withdrawable dry service cassette and its support/access relationship. The free terminal mouths show an assembly stage, not an energized workcell or an approved screwdriver-motor supply.
Keep the electrical decision independent
After a mounting format is feasible, identify the exact loads and their required interface. Record current demand in the relevant machine states, start behavior, permitted voltage at the load and required fault response. Do not infer a current budget from the machine’s size or replace the rotor, actuator or motor feeder with the pictured 35 W class supply.
The LRS specimen has five real front clamps: L, N, protective earth, negative output and positive output beneath the transparent guard. The conductor mouths sit below the screw heads. A route into the roof ventilation, adjustment recess or driver-access position is not a different valid termination. Harness design, restraint, protective measures and service identification remain part of the machine-level engineering review.
A nominal match alone does not prove hold-up performance, electromagnetic behavior, insulation equivalence or the response of the installed system. Those requirements need revision-specific evidence and an agreed qualification plan. No measured values or successful trials are presented here.
Authentic near-front LRS-35-24 source photograph uniformly contained without changing the physical trademark, label, guard or housing. This detail view is identity evidence, not a generated installation.
Use the change window to close a defined release
Prepare the mechanical and harness records before the machine’s planned change window. Confirm the isolation and safe-work procedure, exact supplied revision, support arrangement, service access and actual branch requirements. Treat a trial as a controlled engineering task rather than an opportunity to improvise the bracket or discover an incompatible interface.
At release, retain the accepted drawing, supplied model and revision, harness identification, installation conditions and qualification results. State which machine configuration the decision covers. A later substitution, enclosure change or load addition requires review rather than inheriting a generic “DIN equivalent” or “same voltage” approval.
Retrofit handoff map: establish the support format, confirm the exact candidate and harness, then release a defined machine configuration. It does not specify clearances, approve an adapter or report a completed electrical test.
Frequently asked questions
Can the LRS-35-24 be shown on a DIN rail because the cabinet already has one?
No. This source is chassis-mounted. A different support arrangement needs accepted engineering documentation; a convenient rendering is not evidence.
Is a 30 mm-high supply automatically easier to service?
Not necessarily. The removal path, tool access, harness and full 99 mm depth must fit the actual cassette or plate arrangement.
Do the illustrated screws prove their penetration is correct?
No. The drawing supplies fixing limits, but the actual fastener and support design must be checked independently. Hidden fasteners are not measured by an image.
Does matching 24 V make two mounting formats electrically equivalent?
No. The exact candidate’s performance and the defined machine branch still require their own review.
Engineering selection guide, not an energized-work procedure or machine-compatibility approval. Installation and qualification require responsible, qualified personnel and the applicable OEM safety process.
