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Mean Well

Mean Well LRS-450-12 Power Supply 450W 12V 37.5A

4.7 (17 reviews)
most economical modelultra compact and 1U low profilewithstand 5G vibration and 70°C operation
SKU LRS-450-12
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Select model — 9 in this family

LRS-450-12
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Overview

LRS-450-12 is the 12V output model of this series: rated current 37.5A, rated power 450W, typical efficiency 90%.

LRS-450 series is a 450W single-output enclosed type power supply with 35mm of low profile design. Adopting the input of 115VAC or 230VAC (select by switch), the entire series provides an output voltage line of 5V, 12V, 15V, 24V, 36V and 48V.In addition to the high efficiency up to 92%, with the built-in long life fan LRS-450 can work under -20~+70℃ with full load. LRS-450 has the complete protection functions and 5G anti-vibration capability; It is complied with complete international safety regulations LRS-450 series serves as a high price-to-performance power supply solution for various industrial applications.

Features

  • MEANWELL Patent Number :ZL202220241473.0
  • AC input range selectable by switch
  • Withstand 300VAC surge input for 5 second
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Forced air cooling
  • Built-in cooling Fan ON-OFF control
  • 1U low profile
  • Withstand 5G vibration test
  • High operating temperature up to 70℃
  • Operating altitude up to 5000 meters (Note.10)
  • 3 years warranty
  • MTBF>1KK hrs

Specifications

LRS-450-12Specifications from the official datasheet (2025-09-12 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
37.5A
CURRENT RANGE
0 ~ 37.5A
RATED POWER
450W
RIPPLE & NOISE (max.)Note.2
200mVp-p
VOLTAGE ADJ. RANGENote.3
11.4 ~ 13.2V
VOLTAGE TOLERANCENote.4
±1.5%
LINE REGULATIONNote.5
±0.5%
LOAD REGULATIONNote.6
±1.0%
SETUP, RISE TIMENote.7
1500ms, 50ms/230VAC 1500ms,50ms/115VAC at full load
HOLD UP TIME (Typ.)
16ms/230VAC 12ms/115VAC at full load

INPUT

VOLTAGE RANGENote.8
90 ~ 132VAC / 180 ~ 264VAC by switch 255 ~ 370VDC (swith on 230VAC)
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
90%
AC CURRENT (Typ.)
10A/115VAC 6A/230VAC
INRUSH CURRENT (Typ.)
35A/115VAC 60A/230VAC
LEAKAGE CURRENT
<2mA / 240VAC

PROTECTION (Note.9)

OVER LOAD
105 ~ 150% rated output power Constant current limiting, unit will shutdown after 3 sec. re-power on to recover
OVER VOLTAGE
13.8 ~ 16.2V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE
Shut down o/p voltage, re-power on to recover

FUNCTION

FAN ON/OFF CONTROL (Typ.)
RTH3≧50℃ FAN ON, ≦40℃ FAN OFF

ENVIRONMENT

WORKING TEMP.
-20 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.11)

OVER VOLTAGE CATEGORY
Ⅲ: According to EN61558, EN50178, EN60664-1, EN62477-1; altitude up to 2000 meters
SAFETY STANDARDS
BS IEC/UL 62368-1, EAC TP TC 004,KC62368-1(except for 5V), BIS IS13252(Part1):2010/IEC60950-1: 2005( NOTE 14 ),BSMI CNS15598-1,GB 4943.1,BS EN/EN61558-1,BS EN/EN61558-2-16 approved, Designed by AS/NZS 61558.1/2.16, AS/NZS 62368.1
WITHSTAND VOLTAGE
I/P-O/P:3.75KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms/500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to EAC TP TC 020, BSMI CNS15936,KC KSC 9832, KSC 9835
EMC IMMUNITY
Compliance to EAC TP TC 020,KC KSC 9832, KSC 9835

OTHERS

MTBF
1508.9K hrs min. Telcordia SR-332(Bellcore) ; 252.2K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
225*124*35mm (L*W*H)
PACKING
0.85Kg/15pcs/14.11Kg/0.84CUFT
Test conditions and notes14
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 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. 3. Voltage adjustment can only be operated within the input range of 100~120VAC or 200-240VAC. If the voltage adjustment is performed outside this range, it may cause abnormal output.
  4. 4. Tolerance : includes set up tolerance, line regulation and load regulation.
  5. 5. Line regulation is measured from low line to high line at rated load.
  6. 6. Load regulation is measured from 0% to 100% rated load.
  7. 7. Length of set up time is measured at cold start. Turning the power supply on/off frequently may lead to increase of the set up time.
  8. 8. Derating may be needed under low input voltages. Please refer to"Static Characteristics" sections for details.
  9. 9. Once protections are triggered, 3min(Typ.) of cold down time is required before restart.
  10. 10. The ambient temperature derating of 5℃/1000m is needed for operating altitude greater than 2000m(6500ft).
  11. 11. 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)
  12. 12. This power supply does not meet the harmonic current requirements outlined by EN61000-3-2. Please do not use this power supply under the following conditions: a) the end-devices is used within the European Union, and b) the end-devices is connected to public mains supply with 220Vac or greater rated nominal voltage, and c) the power supply is: - installed in end-devices with average or continuous input power greater than 75W, or - belong to part of a lighting system Exception: Power supplies used within the following end-devices do not need to fulfill EN61000-3-2 a) professional equipment with a total rated input power greater than 1000W; b) symmetrically controlled heating elements with a rated power less than or equal to 200W
  13. 13. RCM is on voluntary basis and meets relevant IEC or AS/NZS standards complying with AS/NZS 4417.1.
  14. 14. Some model may not have the BIS logo, please contact your MEAN WELL sales for more information.

Technical drawings

LRS-450-12 Block Diagram
Block Diagram
LRS-450-12 Derating Curve
Derating Curve
LRS-450-12 Mechanical Specification
Mechanical Specification

Typical applications

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

Downloads

FAQ

What is the input voltage range of the LRS-450-12, and is it compatible with 240V mains?

The LRS-450-12 accepts 90–132VAC or 180–264VAC, selected by a 115/230VAC input switch, so it works on 120V North American mains and on 230V/240V supplies once the switch is set to 230VAC. With the switch on 230VAC it also accepts 255–370VDC. Buyers should set the switch to match their local mains voltage before powering up.

What applications suit the LRS-450-12 at 12V and 37.5A?

At 12V and 37.5A (450W), the LRS-450-12 is well-suited for powering 12V DC motor banks, high-current embedded computing platforms, and automation controllers on 115V or 230V mains. The 450W capacity supports multiple parallel 12V loads simultaneously.

Can the LRS-450-12 operate in high-temperature industrial environments?

The LRS-450-12 operates from -20°C to +70°C, with output derating at higher ambient temperatures (refer to the derating curve), and withstands 5G vibration. Cooling is by a built-in fan that switches on and off with temperature. It is a component power supply meant to be installed inside final equipment, rated for 20–90% RH non-condensing humidity.

What certifications does the LRS-450-12 carry?

The LRS-450-12 is approved to BS IEC/UL 62368-1, EAC TP TC 004, KC62368-1, BIS IS13252, BSMI CNS15598-1, GB 4943.1 and BS EN/EN61558-1/-2-16. It is designed to AS/NZS 61558.1/2.16 and AS/NZS 62368.1, and EMC complies with EAC TP TC 020, BSMI CNS15936 and KC KSC 9832/9835.

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Other LRS-450 Models

1 other model
ModelPowerVoltageCurrent
Mean Well LRS-450-24 Power Supply 450W 24V 18.8A 451.2W 24V 18.8A View
View all 81 LRS Series models

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

  1. 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.

  2. 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.

  3. 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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Mean Well LRS-450-12 Power Supply 450W 12V 37.5A
Mean Well

Mean Well LRS-450-12 Power Supply 450W 12V 37.5A

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LRS-450-12 is the 12V output model of this series: rated current 37.5A, rated power 450W, typical efficiency 90%.

LRS-450 series is a 450W single-output enclosed type power supply with 35mm of low profile design. Adopting the input of 115VAC or 230VAC (select by switch), the entire series provides an output voltage line of 5V, 12V, 15V, 24V, 36V and 48V.In addition to the high efficiency up to 92%, with the built-in long life fan LRS-450 can work under -20~+70℃ with full load. LRS-450 has the complete protection functions and 5G anti-vibration capability; It is complied with complete international safety regulations LRS-450 series serves as a high price-to-performance power supply solution for various industrial applications.

Features

  • MEANWELL Patent Number :ZL202220241473.0
  • AC input range selectable by switch
  • Withstand 300VAC surge input for 5 second
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Forced air cooling
  • Built-in cooling Fan ON-OFF control
  • 1U low profile
  • Withstand 5G vibration test
  • High operating temperature up to 70℃
  • Operating altitude up to 5000 meters (Note.10)
  • 3 years warranty
  • MTBF>1KK hrs

Typical applications

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

Model

  • 35W 12V
  • 100W 12V
  • 150W 12V
  • 200W 12V
  • 350W 12V
  • 450W 12V
  • 50W 12V
  • 600W 12V
  • 75W 12V
View product

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