MEAN WELL LRS vs RSP: Compare Models Before Buying

Set the comparison scope

LRS and RSP are MEAN WELL family names, not single products. Each family spans several output voltages and power levels, so a name alone cannot tell you which supply fits a given machine or panel. This guide compares only the exact models LRS-350-24 and RSP-320-24, and no figure quoted here is extended to other family members.

The LRS side is read from the LRS-350 specification and the RSP side from the RSP-320 specification, both listed under the manufacturer documents at the end of this page. Where a value sits in a series-wide row rather than an exact-model field, that limitation is stated, and the mechanical drawings should still be reviewed by a qualified person before installation.

Build a model-specific specification matrix

The matrix below lists only values extracted from each model's own specification page. Typical efficiency is a typical figure under the datasheet's stated measurement conditions, not a guaranteed minimum, and the RSP ripple figure is a maximum under the datasheet's stated measurement method.

Explain differences that change a buying decision

Three verified distinctions matter most. First, input method: the LRS-350 specification table lists an AC input of 90 ~ 132VAC / 180 ~ 264VAC by switch, so the installed position must match the switch setting; the RSP-320 table lists 88 ~ 264VAC without switch selection. Second, the RSP-320 series is designated by the manufacturer as a 320W single-output series with PFC function, which is a series-level designation to verify for the exact model, not a generic family assumption. Third, ambient capability: the LRS-350 table lists a working temperature of -25 ~ +70℃ and the RSP-320 table lists -30 ~ +70℃, each expressly subject to its derating curve.

• Marketed power-class wording is not the exact rating: the documents give 350.4W for LRS-350-24 and 321.6W for RSP-320-24.
• Rated current differs: 14.6A for LRS-350-24 versus 13.4A for RSP-320-24 at a 24V output.
• Adjustment ranges differ: 21.6~28.8V versus 20 ~ 26.4V; a load trimmed above 26.4V is outside the RSP-320-24 range shown here.
• Cooling control differs: LRS-350 documents a built-in DC fan with fan ON/OFF control; RSP-320 documents a built-in DC fan with fan-speed control.
• Typical efficiency figures of 88% and 89% are typical values under stated datasheet conditions, not like-for-like guarantees.

Check the installation and load requirements

Both mechanical drawings list the same envelope of 215*115*30mm (L*W*H), and both show terminal assignments of AC/L on pin 1, AC/N on pin 2, FG on pin 3, DC OUTPUT -V on pins 4~6 and DC OUTPUT +V on pins 7~9. Identical listed dimensions and matching terminal labels do not prove interchangeability: fixing points, clearances, airflow direction and wiring practice must be checked against each model's installation manual and reviewed by a qualified person.

• Confirm the required continuous and peak load current against the rated current of whichever exact model is being considered.
• Check ambient temperature against the working temperature row and the published derating curve for the exact model.
• Verify enclosure space for 215*115*30mm plus wiring and service clearance, not just the bare envelope.
• Confirm the site mains input and, for the LRS side, that the input-switch setting matches the installation.
• Check any approvals your end equipment requires; a component-level statement in a datasheet does not transfer automatically to finished equipment.

Work through the example pair

Do not treat a family label as an exact rated-power value. The documents state 350.4W for LRS-350-24 and 321.6W for RSP-320-24, with rated currents of 14.6A and 13.4A respectively at 24V.

Hypothetical sizing check (not a measured system): assume a continuous 24V load of 14.0A. Using headroom = rated current − hypothetical load current, LRS-350-24 (14.6A) leaves 0.6A of headroom, while RSP-320-24 (13.4A) falls 0.6A short. This is an arithmetic illustration only; real selection must apply the derating curve, ambient temperature and peak-load behaviour, reviewed by a qualified person.

Define when neither is a confirmed substitute

Nothing in the two specification documents establishes that either model is a substitute, drop-in replacement or automatic upgrade for the other. Neither specification covers equipment-side documentation such as PLC, LED module/strip, controller or dimmer manuals, so compatibility with your equipment cannot be asserted from these documents alone.

• Your equipment's own manuals (controller, LED load or PLC) define its supply requirements; this comparison cannot see them.
• Price, availability and lead time are not part of this comparison; they are confirmed in a quotation.
• Approvals described in the datasheets are component-level statements under stated conditions; end-equipment approval must be re-confirmed.
• Treat both models as candidates, not a confirmed choice, until load, thermal, mechanical and approval checks are complete.

Select a family or request comparison help

If the checks above match one exact model, review that model's own product page before ordering; if the load profile, environment or approvals are unclear, send the load schedule and site conditions with a quote request so the comparison is made on exact-model data rather than family names.