Mean Well Power Supplies and Chargers: An Admin Buyer's FAQ (LRS-100-24, Capacitors, and More)

I manage purchasing for a 120-person office. That puts me in charge of the usual stuff—office supplies, tech, and yes, power supplies. I handle maybe $80,000 a year in orders across six vendors, and a surprising share of that involves Mean Well gear: AC/DC supplies for access control, LED signs, and replacements for wall warts on cordless phones. I'm not an engineer. I'm the admin who reads datasheets so you don't have to.

Quick answers

• Is Mean Well worth it? Usually yes, but not for every project.
• Is a Mean Well charger the same as a power supply? No.
• What is the LRS-100-24 good for? A lot of 24V loads.
• Can it run an Infinity cordless phone base? Only if the voltage and current match.
• How do I test a capacitor with a multimeter? Jump to question 5.

The questions I keep hearing

1. Is Mean Well really worth the extra money?

Honestly? For critical equipment, yes. For a disposable gadget, maybe not. When I first took over purchasing in 2020, I considered lower-priced options. The upside was saving a few dollars per unit. The risk was downtime, failed inspections, and a phone system that smelled like burnt plastic. I kept asking myself: is $7 worth potentially killing a $400 cordless phone base? No.

I've learned to ask "what's NOT included" before "what's the price." A vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.

That's not a marketing line. It's a total-cost thing. If I have to come back on site to re-install a unit, the labor alone eats any savings.

2. What's the difference between a Mean Well charger and a Mean Well power supply?

This one trips up a lot of people. Both convert AC to DC, but a Mean Well charger—like the GC30A or PB-360—is built to charge batteries. It has a charging profile: constant current, then constant voltage, then a lower maintenance stage. A power supply like the LRS-100-24 holds a fixed voltage continuously. If you connect a power supply to a lead-acid battery, you can overcharge it and cause real problems. Basically, use a charger for batteries and a power supply for electronics. They are not interchangeable.

3. What can I use a Mean Well LRS-100-24 for?

The LRS-100-24 is a 100-watt, 24-volt enclosed power supply. According to Mean Well's published spec sheet (meanwell.com), it's rated around 4A. That makes it a pretty solid option for LED strips, access control locks, small automation panels, and replacing older adapters that could not handle continuous loads.

I keep a few in stock because they cover a lot of situations:

• 24V LED lighting in the conference rooms
• Door access controllers and electric locks
• 12V/24V pumps and small motors (check your load first)
• Spare replacements for devices that need a real enclosed supply

For a panel with DIN rail, I'd order the SDR or NDR series instead; the LRS is a flat enclosed supply. There's something satisfying about a shelf of labeled LRS-100-24s instead of a drawer of mystery adapters. After years of "which adapter goes to which device?" questioning, finally having a spec sheet is the payoff. Typical distributor price is around $28–$35 (U.S. quotes, January 2025; verify current pricing).

4. Can I use the LRS-100-24 to replace an Infinity cordless phone base adapter?

Maybe. The brand matters less than the label. If your Infinity cordless phone base says "24V DC" and draws less current than the supply's rating, the LRS-100-24 can work—once you confirm polarity and get the right connector. But if the phone base needs 9V or 12V, a 24V supply will damage it. In that case, a Mean Well GST desktop adapter is more appropriate.

I learned to check labels after a 2022 incident: someone plugged a 24V supply into a 12V base station. Didn't smoke right away. It just smelled weird and got hot. By the time we noticed, it was dead. The surprise wasn't the price of the replacement—it was how easy the damage was to cause.

So, if you're replacing power bricks for cordless phones, find the required voltage and current, then buy the supply that matches. Don't pick by barrel size alone.

5. How do I test a capacitor with a multimeter?

This came up when a "dead" power supply turned out to be a bad capacitor on the load side. If you want to know how to test a capacitor with a multimeter, here's the method our maintenance guy taught me:

1. Switch off the power and disconnect the capacitor from the circuit.
2. Discharge it through a resistor. Do not just short the leads.
3. Set the multimeter to capacitance mode if it has one.
4. Connect the leads and compare the reading to the rating printed on the capacitor.
5. In resistance mode, a good capacitor starts near zero and climbs toward OL ("open line," effectively infinity on a digital meter).
6. If it stays near zero, it's shorted. If it reads OL instantly, it may be open.

I'm not an electrician, but this simple test saved us from throwing away a good Mean Well supply that was only in protection mode because the output capacitor on the device was faulty. Fix the load, and the supply worked fine.

6. Why did my Mean Well supply "die"? (The question you didn't think to ask)

Here's a question that surprises a lot of people: sometimes the supply is fine and the load is the problem. A shorted capacitor, a loose fan, or an internal wiring fault can push a supply into protection mode. Before you toss the "dead" unit, test the capacitor and inspect the output wiring.

Never expected the mystery "dead Mean Well" to test fine. Turns out the supply was doing exactly what it should—shutting down to avoid damage. Once we replaced the shorted cap and reconnected, it came right back to life. That kind of small fix saves us a ton of money and trips to the electronics store.

7. How do I buy Mean Well without getting burned?

Fakes are out there. I buy through authorized distributors and check the printed lot number and QR code on the label. If a quote is way below everyone else's, I treat it as a red flag, not a bargain.

During our 2024 vendor consolidation, we cut from eight vendors to three. The distributors who survived were the ones who sent complete quotes: unit price, shipping, estimated lead time, and the exact Mean Well model number. No "surprise" fees later. The vendor with the lowest headline price often had a hidden handling charge that made it more expensive.

Transparent pricing is the same as transparent engineering. If a supplier won't tell you what's included, assume something isn't.

I'd rather pay $30 for a documented LRS-100-24 than $22 for a supply with a vague label and no datasheet. Having a known model means I can verify specs, find the manual, and order a spare without guessing.