Mean Well LRS-350 Switching Power Supply

What Is the Mean Well LRS-350 Switching Power Supply?

The Mean Well LRS-350 is a single-output enclosed-type AC-DC switching power supply rated for 350 W continuous output, the top of the LRS low-profile line: 30 mm high, 1U-compatible, and — unlike every smaller LRS — force-air cooled by a built-in DC fan under thermostatic control. The order code reads out the same way as its siblings: LRS-350-5 is the 350 W-class unit delivering 5 V, and the series spans 3.3 V to 48 V.

Two engineering decisions define the model. First, the fan: where the LRS-150 and LRS-200 rely on free convection and derate as ambient climbs, the LRS-350’s fan holds full rated load across the entire −25 to +70°C window, switching on only above 50°C and back off below 40°C — silent in a cool cabinet, self-managing in a hot one. Second, the current step on the low-voltage rails: 60 A on the 3.3, 4.2 and 5 V models against the LRS-200’s 40 A, which moves the series from per-module-group supplies into whole-cabinet territory.

Model code on the label: LRS-350-24 = series 350 W class, 24 V output

MEAN WELL’s flicker-free constant-voltage design video covers the platform behavior LED loads depend on:

In the family lineup the LRS-350 sits at the top: the LRS-150 covers 12–48 V auxiliary buses, the LRS-200 adds the 3.3/4.2/5 V screen rails at 40 A, and the LRS-350 doubles down with 60 A and the fan. All three are siblings; the comparison table below prices the differences.

What Are the Mean Well LRS-350 Specifications?

All figures come from the official MEAN WELL LRS-350 specification sheet (2025-09-12 revision). As with the LRS-200, the series name is a class label, not a per-model rating: the 3.3 V model delivers 198 W, the 5 V model exactly 300 W, and the 24/48 V models 350.4 W.

Model	Output	Rated power	Adj. range	Ripple max	Efficiency
LRS-350-3.3	3.3 V / 60 A	198 W	2.97–3.6 V	150 mVp-p	79.5%
LRS-350-4.2	4.2 V / 60 A	252 W	3.6–4.4 V	150 mVp-p	81.5%
LRS-350-5	5 V / 60 A	300 W	4.5–5.5 V	150 mVp-p	83.5%
LRS-350-12	12 V / 29 A	348 W	10.2–13.8 V	150 mVp-p	85%
LRS-350-15	15 V / 23.2 A	348 W	13.5–18 V	150 mVp-p	86%
LRS-350-24	24 V / 14.6 A	350.4 W	21.6–28.8 V	200 mVp-p	88%
LRS-350-36	36 V / 9.7 A	349.2 W	32.4–39.6 V	200 mVp-p	88.5%
LRS-350-48	48 V / 7.3 A	350.4 W	43.2–52.8 V	200 mVp-p	89%

Parameter	LRS-350 series
Input voltage range	90–132 VAC / 180–264 VAC selected by switch; 240–370 VDC with switch on 230 VAC
Input frequency / current	47–63 Hz; 6.8 A at 115 VAC, 3.4 A at 230 VAC (typ.)
Inrush / surge endurance / leakage	60 A cold start at 115 and 230 VAC; 300 VAC surge for 5 s; <2 mA at 240 VAC
Setup / rise / hold-up time	1500 ms / 50 ms full load; hold-up 16 ms at 230 VAC, 12 ms at 115 VAC (typ.)
No-load power draw	<0.75 W
Overload	110–140% rated power; 150% peak for 1 s built in (12–48 V models, Note 7)
Overvoltage / overtemperature	3.3–36 V models: hiccup, auto-recovery; 48 V model: shutdown, re-power to reset
Short circuit	Hiccup mode, recovers automatically after the fault clears
Cooling	Built-in DC fan, thermostatic: ON ≥50°C, OFF ≤40°C; forced-air full load −25 to +70°C
Withstand / insulation	I/P-O/P 3.75 kVAC; I/P-FG 2 kVAC; O/P-FG 0.5 kVAC; 100 MΩ at 500 VDC
Environment	−25 to +70°C, 20–90% RH non-condensing; storage −40 to +85°C; 5 G vibration; 2,000 m full load, 5,000 m derated
MTBF	2,099.9K hrs min. (Telcordia SR-332); 328.6K hrs min. (MIL-HDBK-217F, 25°C)
Dimensions / weight	215 × 115 × 30 mm (case 207A); 0.76 kg; 15 pcs per 12.4 kg carton
Safety standards	IEC/UL 62368-1; BSMI CNS15598-1; EAC TP TC 004; KC 62368-1 (-12/-24); GB 4943.1; BIS IS 13252; BS EN/EN 61558-1/-2-16
EMC	Immunity: BS EN/EN 55035; BSMI CNS15936. Harmonics: does not meet BS EN/EN 61000-3-2 (datasheet Note 10)
Build and warranty	100% full-load burn-in; 65 kHz switching; LED power indicator; 3-year warranty

Same 215 × 115 — 30 mm case as the LRS-200; airflow direction is marked on the mechanical drawing

Fan grille on the top face, 9-pin terminal row along the front edge

Which Mean Well LRS-350 Voltage Should You Order?

The eight models split into the same two families as the LRS-200, with bigger numbers:

Trim discipline carries over unchanged: the +ADJ pot compensates cable drop inside the model’s window (4.5–5.5 V on the 5 V unit), it does not convert between voltage classes. On the 4.2 V rail the trim window matters doubly, because common-cathode screens ride their LED bus close to the limit — the common cathode LED technology guide explains the architecture before any screw gets turned. And at 60 A the wiring rules from the LRS-200 get stricter, not looser — three terminals per pole are the minimum landing for that current, covered in the installation section.

Same chassis across all eight voltages: fan grille top, terminals front, M4 flanges both sides

How Does the Mean Well LRS-350-5 Compare With the CZCL A-300AB-5?

The LRS-200-5 met the CZCL A-200AC-5 at 5 V / 40 A; the LRS-350-5 meets its big brother at 5 V / 60 A / 300 W — the exact rating of the CZCL A-300AB-5:

Same electrical job, two different bets. The LRS-350-5 bets on documentation: published efficiency, a published MIL-method MTBF figure that leads this pairing, the thermostatic fan holding full load to 70°C, the 115 V input switch, and global distribution at a public street price with a 3-year warranty. The A-300AB-5 bets on integration: a slimmer 81.5 mm-deep body that squeezes into narrower cabinets, and the CZCL harmony that the screen-side family — hubbed at the CZCL power supply collection, with the A-300AB-5 spec’d on its own page at CZCL A-300AB-5 LED switching power — has proven across rental and fixed installs. On the EU compliance point from the section below, neither unit’s harmonic story is clean here: the LRS-350 by Note 10, the A-300AB-5 only by its EN 61000-3-2 reference — check the project’s classification before promising either.

LRS-350-5: 5 V • 60 A • 300 W on the label

Base plate of the 5 V model: ventilation grid and mounting holes

How Does the Mean Well LRS-350 Fan Cooling Work?

The fan is the whole point of the model, so it is worth knowing exactly how it behaves. The control is thermostatic, tied to an internal sensor (RTH3): fan on at 50°C, fan off at 40°C. In a cool, ventilated cabinet the unit runs silent and convection does the work; as internal temperature climbs past 50°C the fan spins up on its own — no user setting, no jumper. That is what buys the headline spec: full rated load from −25 to +70°C ambient, where the convection-cooled LRS-150 and LRS-200 must derate at the hot end.

The teardown shows how little space the fan actually occupies behind the grille:

Inside the LRS-350: the DC fan sits at the short end, airflow crosses the sink toward the terminal edge

Respect the airflow direction when you mount it — the mechanical drawing marks the path, and blocking either end converts the fan’s work into noise and a hot spot rather than cooling. The 5 G vibration rating means the fan bearing is qualified for vehicle and pole mounts, but dust load, not vibration, is what kills cabinet fans in the field.

How Much LED Load Can a Mean Well LRS-350 Carry?

Apply the 80% rule to each model’s rated power:

The five ecosystem voltages converge on 278–280 W usable — effectively one number to remember. On the screen bus, the 5 V model’s 240 W usable budget covers what two LRS-200-5 units carry, and a module string drawing 300 W wants two LRS-350-5 units on separate groups, never one at 100%. The screen-level arithmetic is worked through in the LED display power consumption guide and the per-cabinet counting method.

And the recurring honesty note: 150%-for-1-second peak capability remains a 12–48 V feature. The 3.3/4.2/5 V rails ride the ordinary 110–140% hiccup band — size module buses against the 240 W figure, not the 450 W peak story.

What Protections and Certifications Does the Mean Well LRS-350 Carry?

Short circuit and overload pulse in hiccup mode and recover automatically; overvoltage and overtemperature split by voltage class exactly as on the LRS-200: 3.3–36 V models pulse and self-recover, the 48 V model latches off until a re-power cycle. Isolation is 3.75 kVAC input-to-output with 100 MΩ insulation resistance — the official measurement method:

Safety approvals mirror the LRS-200 — IEC/UL 62368-1, BS EN/EN 61558-1/-2-16, GB 4943.1, BIS, BSMI, EAC — an industrial/AV list without the household-appliance approval the LRS-150 carries. Ripple and noise is 150 mVp-p through 15 V and 200 mVp-p from 24 V up.

How Do You Install and Wire a Mean Well LRS-350 Safely?

The 9-pin block matches the LRS-200: pins 1–2 are AC L/N, pin 3 is FG, pins 4–6 are −V and pins 7–9 are +V. At 60 A the three-terminals-per-pole rule is not a recommendation — it is the only correct landing for that current.

Terminal map on the LRS-350-12: ADJ, +V triple, −V triple, ground, N, L

How Does the Mean Well LRS-350 Compare With the LRS-150 and LRS-200?

The three-stage family picture, one table:

Read as a decision path: need the 5 V module bus at cabinet scale — or full 350 W without a derating cliff — the LRS-350 is the pick, with the fan-service caveat. Need the screen bus at 40 A or auxiliary power in a silent sealed cabinet, the LRS-200. Pure 12–48 V auxiliary work in EU-visible installs, the LRS-150 stays the compliance-safe choice. MTBF crosses over at the top: the LRS-350’s 328.6K figure beats the LRS-200’s 279.4K, though both trail the convection-cooled 150 — fan models carry moving parts, and the reliability math says so.

What Problems Does a Failing Power Supply Cause?

Fan-cooled supplies add one failure mode the convection models do not have — here is the symptom map:

The replacement workflow — isolation, metering, swap, verification — on an indoor screen cabinet, start to finish:

The full written procedure is in the power supply diagnostics and replacement guide.

How Much Does the Mean Well LRS-350 Cost?

Standard catalog part, public street price — stable against the 2026 component-cost story in the LED display supply chain price surge analysis:

The bracket runs $29.50–$39 across channels. The per-watt arithmetic from the CZCL power supply price guide: at $29.50 for the 5 V model’s 300 W rated, an LRS-350-5 costs about 9.8 cents per rated watt; the 24 V model at $32.10 for 350.4 W lands near 9.2 cents. Between the LRS-200’s 12.3–15.5 cents and this 9.2–9.8 cents, the family price curve bends your way exactly where the power rises — the fan-cooled top of the line is also its cheapest power per watt.

Buying caution unchanged: verify the serial number on the MEAN WELL website before deployment — the LRS line is the most cloned series in the segment, and at 60 A a counterfeit isolation barrier is a fire inspection waiting to happen.

Mean Well LRS-350: Frequently Asked Questions

Related Power Pages and Guides

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