How to Read MEAN WELL Part Numbers — LRS-350-24 · HLG-240H-24AB: the numbers are power and voltage; suffixes A · B · AB · DA · P1J

Image description: At the counter of an electronic components shop, a customer holds two silver LED power supplies. The labels read HLG-240H-24 and HLG-240H-24A. The customer asks, “It's just one A at the end, so they're the same, right?” A female clerk in a red apron points to the one with the A and answers, “A means you can adjust voltage and current with the potentiometer!”

MEAN WELL is a Taiwanese power supply company that makes SMPS, LED drivers, DIN rail power supplies and adapters. In Guro, MEAN WELL part numbers such as LRS-350-24 · HLG-240H-24A are frequently searched. Most MEAN WELL part numbers follow the order series name - power - output voltage, so just reading the numbers gets you halfway. The confusing part is the letters at the end. Even within the same LED driver, A means the potentiometer-adjustable type and B means the brightness-adjustable (dimming) type — pick the wrong letter and you cannot adjust it on site.

All values were checked against the Model Encoding diagrams · Type tables · model tables of 13 official MEAN WELL datasheets (LRS-350 · RSP-500 · HRP-600 · IRM-20 · HDR-60 · NDR-120 · SDR-240 · RSD-60 · LPV-100 · HLG-240H · ELG-150 · XLG-150 · GST60A). The meanings of series-name letters such as LRS · HLG are not stated in the datasheets, so they are not explained here. Click a part number to search for stock in eGuro Part Search.

1. Decoding one part number (LRS-350-24 · HLG-240H-24AB)

The Model Encoding diagram on page 1 of a MEAN WELL datasheet names each field of the part number. For LRS-350 they are Series name · Output power · Output voltage; for HLG-240H they are Series name · Rated wattage · Rated output voltage · Function options. The H of HLG-240H is grouped with 240 into one field (Rated wattage) in the diagram, and no separate meaning is given for it.

2. Middle number = power, but you don't always get all of it

The middle number is the representative power of the series. However, low-output-voltage models do not deliver the full power indicated by the number because of their current limit. Below are the rated powers (RATED POWER) exactly as listed in the datasheet model tables.

The rated power of ELG-150 depends on the input voltage — 84~105W at 100~180VAC input and 120~150W at 200~305VAC (the title also says “84~150W”).

3. Last number = output voltage (07 is 7.5V)

In the XLG-150 Model Encoding diagram, L · M · H sit in the “Rated output voltage” field, but what actually differs in the model table is the default rated current (L 700mA · M 1400mA · H 2800mA, all 150W). The GST60A adapter uses two-digit voltages, so the 07 in GST60A07-P1J is 7.5V (model table DC VOLTAGE 7.5V).

4. LED driver suffixes — Blank · A · B · AB · DA

For LED drivers (HLG · ELG · XLG), the most important thing is the function letter after the voltage. The tables are taken directly from the Type table on page 1 of each datasheet. In stock · by request (made to order) follow the Note column of the table (In Stock · By request).

HLG-240H (e.g. HLG-240H-24A)

Image description: A customer holds HLG-240H-24 and, pointing at a brightness dial on the counter, says with a troubled look, “I can't adjust the brightness…” A female clerk holds out a product labeled HLG-240H-24B and says with a smile, “For dimming you need the one with B at the end!”

ELG-150 (e.g. ELG-150-24B)

For ELG, a hyphen and the input wiring may follow the function letter. Blank means 2-wire input, -3Y means 3-wire input (e.g. ELG-150-24A-3Y).

XLG-150 (e.g. XLG-150-M-AB)

5. Letters right after the power number — G · L · H of RSD, I of XLG

RSD-60 is a railway DC-DC converter, so the input voltage range is set by the letter right after the power number. The output voltage (3.3 · 5 · 12 · 24) comes after the following hyphen. Even within RSD-60, different G · L · H mean different allowable input voltages, so they cannot be substituted for each other.

6. Same letter, different meaning in each series

So you should never order by the letter alone, like “the one with A at the end” — always check it together with the series name against the table in that series' datasheet.

7. Adapter suffixes — P1J of GST60A12-P1J

The part before the hyphen is written without hyphens, and the part after the hyphen is the DC plug type. The standard is P1J (inner diameter 2.1 · outer diameter 5.5 · length 11mm, center +); other plugs are chosen from the table on pages 4~5 of the datasheet.

The datasheet does not explain the plug-letter rules in words. Looking at the table, they match up as P1 = tuning fork type · P2 = barrel type · P3 = mini pin · P4 = center pin, I · J = inner diameter 2.1 · L · M = 2.5, I · L = length 9.5 · J · M = 11.0, and a trailing R = right-angled. Non-standard plugs have a minimum order quantity (MOQ) or are swapped using separately sold conversion adapters.

8. Commonly searched part numbers explained

All of these part numbers appear in the model table of each datasheet (or were matched from the Type table and Model Encoding). Available voltages differ by series (e.g. NDR-120 comes only in 12 · 24 · 48V), so do not make up and search for part numbers with voltages that don't exist.

9. What to check when substituting

• Rated power — compare by the rated power · current of that part number, not the number in the name (5V · 3.3V models are lower than the number)
• LED driver suffix — if A (potentiometer) · B (dimming) · AB · DA (DALI) differ, the adjustment method on site differs. Where dimming is needed, use the right one of B · AB · DA
• Dimming voltage — B on HLG is 1~10V; dimming on ELG · XLG is 0~10V
• Waterproof rating — on HLG · ELG, A · AB are IP65 and Blank · B are IP67
• Input voltage letter — G · L · H of RSD-60 have different input ranges and cannot replace each other
• Adapter plug — even with the same voltage · power, P1J and P2L fit different jacks
• By request (made to order) — C · D of HLG and Blank · CV of XLG are marked By request in the datasheets

Sources: Model Encoding · Type tables · model tables of official MEAN WELL datasheets LRS-350 (2025-09-12) · RSP-500 (2025-09-26) · HRP-600 (2026-04-03) · IRM-20 (2025-11-21) · HDR-60 (2026-10-09) · NDR-120 (2026-04-03) · SDR-240 (2025-02-17) · RSD-60 (2026-07-09) · LPV-100 (2026-09-07) · HLG-240H (2026-02-04) · ELG-150 (2026-07-06) · XLG-150 (2026-02-04) · GST60A (2026-04-03). The meanings of series-name letters and the adapter plug-letter rules are not stated in words in the datasheets. Before placing an actual order, check the datasheet of that part number.