Mean Well IRM-45-12ST Switching Power Supply 45.6W 12V 3.8A

Name: Mean Well IRM-45-12ST Switching Power Supply 45.6W 12V 3.8A - Encapsulated
Brand: Mean Well
SKU: IRM-45-12ST
Price: 16.87 USD
Availability: InStock

Overview

IRM-45-12ST is the 12V output model of this series: rated current 3.8A, rated power 45.6W, typical efficiency 87.5%.

IRM-45 is a 45W miniature (87*52*29.5mm) AC-DC module-type power supply, ready to be soldered onto the PCB boards of various kinds of electronic instruments or industrial automation equipments. This product allows the universal input voltage range of 85~305Vac. The 94V-0 flame retardant plastic case and potted with silicone enhance the heat dissipation. PCB mounting style model(Blank) meet the anti-vibration demand up to 2G and screw terminal style model (ST) meet the anti-vibration demand up to 5G; moreover, it provides the fundamental resistance to dust and moisture. With the high efficiency up to 90.5% and the extremely low no-load power consumption below 0.15W, IRM-45 series fulfills the worldwide regulation for the low power consumption requirement for electronics. The entire series is a Class Ⅱ design (no FG pin), incorporating the built-in EMI filtering components, enabling the compliance with BS EN/EN55032 Class B; the supreme EMC features keep the end electronic units from electromagnetic interference. In addition to the PCB mounting style model, IRM-45 series also offers the screw terminal style model (ST).

Features

3.43''x2.05''compact size
PCB,chassis or screw terminal mounting version
Universal input 85~305Vac
No load power consumption<0.15W
EMI Class B without additional components
Wide operating temp. range -30~85℃
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
Isolation Class Ⅱ
Over voltage category Ⅲ (OVC Ⅲ)
Pass LPS(Except for 5V)
3 years warranty

Specifications

IRM-45-12STSpecifications from the official datasheet (2025-11-21 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 3.8A
CURRENT RANGE: 0 ~ 3.8A
RATED POWER: 45.6W
RIPPLE & NOISE (max.)^Note.2: 150mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 1000ms, 30ms/230Vac 2000ms, 30ms/115Vac at full load
HOLD UP TIME (Typ.): 50ms/230Vac 12ms/115Vac at full load

INPUT

VOLTAGE RANGE: 85 ~ 305Vac
FREQUENCY RANGE: 47 ~ 440Hz
EFFICIENCY (Typ.): 87.5%
AC CURRENT (Typ.): 1.5A/115Vac 0.9A/230Vac 0.75A/277Vac
INRUSH CURRENT (Typ.): COLD START 30A/115Vac 60A/230Vac
LEAKAGE CURRENT: < 0.25mA/277Vac

PROTECTION

OVERLOAD: 115%~160% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 12.6 ~ 16.2V Protection type : Shut off o/p voltage, clamping by zener diode

ENVIRONMENT

WORKING TEMP.: -30 ~ +85℃ (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: Blank:10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes ST:10 ~ 500Hz, 5G 10min./1cycle, period for 60min. each along X, Y, Z axes
SOLDERING TEMPERATURE: Wave soldering: 265℃,5s (max.); Manual soldering: 390℃,3s (max.)
OPERATING ALTITUDE^Note.4: 2000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC62368-1,IEC61558-1/-2-16,UL62368-1,TUV BS EN/EN62368-1,BS EN/EN60335-1,BS EN/EN61558-1/-2-16, EAC TP TC 004, BSMI CNS15598-1 approved
OVER VOLTAGE CATEGORY: IEC/EN 61558-1/-2-16(OVC Ⅲ, altitude up to 2000m); IEC/EN/UL 62368-1(OVC Ⅲ, altitude up to 2000m); IEC/EN 60335-1(OVC Ⅱ,altitude up to 2000m)
WITHSTAND VOLTAGE: I/P-O/P:4.2KVac
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32), CNS15936 Class B
Radiated BS EN/EN55032(CISPR32), CNS15936 Class B
Harmonic Current (Note 5) BS EN/EN61000-3-2 Class A
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY^Note.5: BS EN/EN55035, BS EN/EN61000-6-2

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility BS EN/EN61000-4-3 Level 3, criteria A
EFT/Burest BS EN/EN61000-4-4 Level 3, criteria A
Surge BS EN/EN61000-4-5 Level 4, 2KV/L-N, criteria A
Conducted BS EN/EN61000-4-6 Level 3, criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, criteria A
Voltage Dips and interruptions BS EN/EN61000-4-11 ＞95% dip 0. 5 periods, 30% dip 25 periods, ＞95% interruptions 250 periods

Parameter	Standard	Test Level
Conducted	BS EN/EN55032(CISPR32), CNS15936	Class B
Radiated	BS EN/EN55032(CISPR32), CNS15936	Class B
Harmonic Current (Note 5)	BS EN/EN61000-3-2	Class A
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility	BS EN/EN61000-4-3	Level 3, criteria A
EFT/Burest	BS EN/EN61000-4-4	Level 3, criteria A
Surge	BS EN/EN61000-4-5	Level 4, 2KV/L-N, criteria A
Conducted	BS EN/EN61000-4-6	Level 3, criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, criteria A
Voltage Dips and interruptions	BS EN/EN61000-4-11	＞95% dip 0. 5 periods, 30% dip 25 periods, ＞95% interruptions 250 periods

OTHERS

MTBF: 6451.1K hrs min. Telcordia SR-332 (Bellcore) ; 1212.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: PCB mounting style : 87*52*29.5mm (L*W*H) Screw terminal style : 109*52*33.5mm (L*W*H)
PACKING: PCB mounting style : 0.195Kg;60pcs/12.7Kg/0.94CUFT Screw terminal style :0.228Kg; 50pcs/12.4Kg/0.56CUFT

Test conditions and notes5

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 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
5. The power supply is considered as an independent unit ,but the final equipment still need to re-confirm that the whole system complieswith the 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 )

Technical drawings

IRM-45-12ST Derating Curve — Derating Curve

IRM-45-12ST Mechanical Specification — Mechanical Specification

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Handheld electronic device

Downloads

Certificates4

EMC Certificate (IRM-45)(EN) PDF Download

UL Certificate (IRM-45)(EN) PDF Download

CB Certificate (IRM-45)(EN) PDF Download

TUV Certificate (IRM-45)(EN) PDF Download

Test reports1

Test Report(IRM-45-12)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-45-12ST for a 12V industrial control box with sensors and small relays?

Yes, it is a constant voltage 12V supply rated for 45.6W and 3.8A, which fits 12V control loads that stay within that output. The wide 85-305VAC input also suits equipment used across different AC supply ranges.

Is the IRM-45-12ST suitable for 12V embedded controllers or HMI support circuits?

It can be a fit when the controller or support electronics require a regulated 12V output and the total load does not exceed 3.8A or 45.6W. Its encapsulated format and screw terminal style make it more aligned with enclosed equipment than open-frame power sections.

Can this 12V power supply run 12V automation accessories inside a machine cabinet?

Yes, for 12V accessories that use constant voltage and stay within 45.6W total output, this model matches that electrical requirement. Its operating temperature range is -30°C to +85°C (with derating at higher temperatures), which supports use in a wide range of enclosed industrial environments.

What is the difference between the IRM-45-12ST and other IRM-45 models?

Within the IRM-45 range, the outputs are 5V at 8A and 40W, 12V at 3.8A and 45.6W, 15V at 3A and 45W, 24V at 1.9A and 45.6W, and 48V at 0.94A and 45.12W. The ST versions use screw terminal style, while the non-ST versions in the same output class use PCB mounting style.

Is the IRM-45-12ST suitable for outdoor or cold-temperature use?

The operating temperature range is -30°C to +85°C, with load derating per the derating curve, so its temperature spec covers both cold and hot conditions within that band. The provided specs do not list an IP rating, so outdoor or wet-location suitability cannot be confirmed from these specs alone.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well IRM-45-5ST Switching Power Supply 40W 5V 8A - Encapsulated	40W	5V	8A	IP20	$16.87	View
Mean Well IRM-45-5 Switching Power Supply 40W 5V 8A - Encapsulated	40W	5V	8A	IP20	$15.35	View
Mean Well IRM-45-48ST Switching Power Supply 45.12W 48V 0.94A - Encapsulated	45.12W	48V	0.94A	IP20	$16.86	View
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Mean Well IRM-45-24ST Switching Power Supply 45.6W 24V 1.9A - Encapsulated	45.6W	24V	1.9A	IP20	$16.87	View
Mean Well IRM-45-24 Switching Power Supply 45.6W 24V 1.9A - Encapsulated	45.6W	24V	1.9A	IP20	$14.61	View
Mean Well IRM-45-15ST Switching Power Supply 45W 15V 3A - Encapsulated	45W	15V	3A	IP20	$16.86	View
Mean Well IRM-45-15 Switching Power Supply 45W 15V 3A - Encapsulated	45W	15V	3A	IP20	$15.35	View
Mean Well IRM-45-12 Switching Power Supply 45.6W 12V 3.8A - Encapsulated	45.6W	12V	3.8A	IP20	$15.35	View

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Mean Well IRM-45-12ST Switching Power Supply 45.6W 12V 3.8A - Encapsulated

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