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Mean Well LRS-50-12 Power Supply 50W 12V 4.2A

4.7 (17 reviews)

most economical modelultra compact and 1U low profilewithstand 5G vibration and 70°C operation

SKU LRS-50-12

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LRS-50-12

LRS-35-12 35W 12V In stock

LRS-100-12 100W 12V Low stock

LRS-150-12 150W 12V Low stock

LRS-200-12 200W 12V Low stock

LRS-350-12 350W 12V Low stock

LRS-450-12 450W 12V Low stock

LRS-50-12 50W 12V In stock

LRS-600-12 600W 12V Low stock

LRS-75-12 75W 12V Low stock

Product variants

In stock

Overview

LRS-50-12 is the 12V output model of this series: rated current 4.2A, rated power 50.4W, typical efficiency 86%.

LRS-50 series is a 50W single-output enclosed type power supply with 30mm of low profile design. Adopoting the full range 85~264VAC input, the entire series provides an output voltage line of 3.3V, 5V, 12V, 15V, 24V, 36V and 48V. In addition to the high efficiency up to 90%, the design of metallic mesh case enhances the heat dissiptation of LRS-50 that the whole series operates from -30℃ through 70℃ under air convection without a fan. Delivering an extremely low no load power consumption (less than 0.2W), it allows the end system to easily meet the worldwide energy reqirement. LRS-50 has the complete protection functions and 5G anti-vibration capability; it is complied with the international safety regulations such as TUV BS EN/EN62368-1, BS EN/EN60335-1,BS EN/EN61558-1/-2-16, UL62368-1 and GB 4943.1. LRS-50 series serves as a high price-to-performance power supply solution for various industrial applications.

Features

Universal AC input / Full range
Withstand 300VAC surge input for 5 second
No load power consumption<0.3W
Miniature size and 1U low profile
High operating temperature up to 70℃
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
Compliance to IEC/BS EN/EN 60335-1(PD3) and IEC/BS EN/EN61558-1, -2-16 for household appliances
Operating altitude up to 5000 meters (Note.8)
Withstand 5G vibration test
High efficiency, long life and high reliability
LED indicator for power on
Over voltage category Ⅲ
100% full load burn-in test
3 years warranty

Specifications

LRS-50-12Specifications from the official datasheet (2025-04-07 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 4.2A
CURRENT RANGE: 0 ~ 4.2A
RATED POWER: 50.4W
RIPPLE & NOISE (max.)^Note.2: 120mVp-p
VOLTAGE ADJ. RANGE: 10.2 ~ 13.8V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION^Note.4: ±0.5%
LOAD REGULATION^Note.5: ±0.5%
SETUP, RISE TIME: 1000ms, 30ms/230VAC 2000ms,30ms/115VAC at full load
HOLD UP TIME (Typ.): 30ms/230VAC 12ms/115VAC at full load

INPUT

VOLTAGE RANGE: 85 ~ 264VAC 120 ~ 373VDC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 86%
AC CURRENT (Typ.): 0.95A/115VAC 0.56A/230VAC
INRUSH CURRENT (Typ.): COLD START 45A/230VAC
LEAKAGE CURRENT: <0.75mA / 240VAC

PROTECTION

OVER LOAD: 110 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 13.8 ~ 17.2V Protection type : Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: -30 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes
OVER VOLTAGE CATEGORY: Ⅲ; Compliance to BS EN/EN61558, BS EN/EN50178, BS EN/EN60664-1, BS EN/EN62477-1; altitude up to 2000 meters

SAFETY & EMC (Note 9)

SAFETY STANDARDS: UL62368-1, TUV BS EN/EN62368-1, BS EN/EN60335-1, BS EN/EN61558-1/-2-16,GB 4943.1, BSMI CNS15598-1, EAC TP TC 004, AS/NZS 60950.1(by CB),KC K60950-1(for LRS-50-12/24 only), BIS IS13252(Part1): 2010/IEC 60950-1: 2005(NOTE 10) approved
WITHSTAND VOLTAGE: I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:1.25KVAC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032 (CISPR32) Class B, BS EN/EN55014, BS EN/EN61000-3-2,-3, GB17625.1,GB/T 9254.1, BSMI CNS15936, EAC TP TC 020,KC KN32,KN35(for LRS-50-12/24 only)
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN61000-6-2 (BS EN/EN50082-2),BS EN/EN55035, heavy industry level, EAC TP TC 020,KC KN32,KN35(for LRS-50-12/24 only)

OTHERS

MTBF: 3149.8K hrs min. Telcordia SR-332 (Bellcore) ; 561.6Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 99*82*30mm (L*W*H)
PACKING: 0.21Kg; 60pcs/14Kg/0.93CUFT

Test conditions and notes10

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Line regulation is measured from low line to high line at rated load.
5. Load regulation is measured from 0% to 100% rated load.
6. Length of set up time is measured at cold first start. Turning ON/OFF the power supply very quickly may lead to increase of the set up time.
7. 3.3V,5V when the load factor 0~50%, the switching power less is reduced by burst operation, which will cause ripple and ripple noise to go beyond the specifications.
8. The ambient temperature derating of 5℃/1000m is needed for operating altitude greater than 2000m(6500ft).
9. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
10. Some model may not have the BIS logo, please contact your MEAN WELL sales for more information.

Technical drawings

LRS-50-12 Derating Curve — Derating Curve

LRS-50-12 Mechanical Specification — Mechanical Specification

Typical applications

Industrial automation machinery
Industrial control system
Mechanical and electrical equipment
Electronic instruments, equipments or apparatus
Household appliances

Downloads

Certificates6

UL Certificate (LRS-50)(EN) PDF Download

CB(60950) Certificate (LRS-50)(EN) PDF Download

CB(61558) Certificate (LRS-50)(EN) PDF Download

EMC Certificate (LRS-50)(EN) PDF Download

TUV(60335) Certificate (LRS-50)(EN) PDF Download

TUV(60950) Certificate (LRS-50)(EN) PDF Download

Test reports1

Test Report (LRS-50-12)(EN) PDF Download

Catalogues2

Mean Well Catalog (Industrial) PDF Download

Mean Well Sign Panel Catalog PDF Download

FAQ

What kinds of low-power devices can the LRS-50-12 supply at 12V?

The LRS-50-12 outputs 12V at 4.2A (50.4W), suitable for powering single-board computers, IP cameras, small 12V fans, access control readers, and compact embedded controllers. Its 99 × 82 × 30 mm footprint makes it practical in space-constrained enclosures.

How does the LRS-50-12 compare to other LRS-50 voltage variants?

All LRS-50 models share the same 99 × 82 × 30 mm case and 0.21 kg weight. Output by voltage: LRS-50-3.3 (33W, 10A), LRS-50-5 (50W, 10A), LRS-50-12 (50.4W, 4.2A), LRS-50-15 (51W, 3.4A), LRS-50-24 (52.8W, 2.2A), LRS-50-36 (52.2W, 1.45A), LRS-50-48 (52.8W, 1.1A). Wattage is roughly similar across models; current scales inversely with voltage.

What is the operating temperature range of the LRS-50-12, and is it suitable for cold-start environments?

The LRS-50-12 operates from -30°C to +70°C (with derating per the derating curve), the same range as every LRS-50 model. This low-end rating allows cold-start operation in unheated outdoor enclosures or cold-storage facility control panels where temperatures can drop well below freezing.

Does the LRS-50-12 have a universal AC input?

Yes, the LRS-50-12 accepts 85–264VAC, covering 100V (Japan), 120V (North America), and 230V (Europe/international) mains. This universal input simplifies global product variants and procurement across different regional electrical standards.

Which certifications does the LRS-50-12 carry, and are they sufficient for commercial building installations?

The LRS-50-12 is approved to UL62368-1, TÜV BS EN/EN62368-1, GB 4943.1, BSMI CNS15598-1, EAC TP TC 004, AS/NZS 60950.1 (by CB) and BIS IS13252, plus KC K60950-1 (LRS-50-12/24 only). As a component power supply, the sheet requires the final equipment to be re-confirmed for compliance, so building installations must be assessed as a whole.

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Model	Power	Voltage	Current
Mean Well LRS-50-5 Power Supply 50W 5V 10A	50W	5V	10A	View
Mean Well LRS-50-15 Power Supply 50W 15V 3.4A	51W	15V	3.4A	View
Mean Well LRS-50-24 Power Supply 50W 24V 2.2A	52.8W	24V	2.2A	View

Customer reviews

4.7 Reviews verified for authenticity

5 ★ (13)

4 ★ (3)

3 ★ (1)

2 ★ (0)

1 ★ (0)

Reviewed by 17 customers across the LRS series

Cheap and reliable enclosed PSU
By Ravi N.|2026-06-14✓ Verified Buyer
Model: LRS-50-24Quantity: 10
LRS-50-24 powers our sensor rack. Great price, no fuss.
Good budget option
By Kelly B.|2026-05-20✓ Verified Buyer
Model: LRS-100-24Quantity: 4
Runs a bit warm in a sealed box — add airflow. Otherwise solid.
Standardised on these
By FitOut Ltd|2026-04-25
Model: LRS-350-24Quantity: 25
Use LRS across all our retail fit-outs now.

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