Mean Well IRM-20-12 Switching Power Supply 3W 12V 1.8A - Encapsulated

Name: Mean Well IRM-20-12 Switching Power Supply 3W 12V 1.8A - Encapsulated
Brand: Mean Well
SKU: IRM-20-12
Price: 11.97 USD
Availability: InStock

Overview

IRM-20-12 is the 12V output model of this series: rated current 1.8A, rated power 21.6W, typical efficiency 84%.

IRM-20 is a 20W miniature (52.4*27.2*24mm) 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~ 305 Vac. The 94V-0 flame retardant plastic case and potted with silicone enhance the heat dissipation and meet the anti-vibration demand up to 2G; moreover, it provides the fundamental resistance to dust and moisture. With the high efficiency up to 85% and the extremely low no-load power consumption below 0.1W, IRM-20 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.

Features

2.06''x1.07''compact size
Universal input 85~305Vac
No load power consumption<0.1W
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
3 years warranty

Specifications

IRM-20-12Specifications from the official datasheet (2025-11-21 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 1.8A
CURRENT RANGE: 0 ~ 1.8A
RATED POWER: 21.6W
RIPPLE & NOISE (max.)^Note.2: 200mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.3%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME: 1000ms, 20ms/230Vac 1000ms, 20ms/115Vac at full load
HOLD UP TIME (Typ.): 40ms/230Vac 8ms/115Vac at full load

INPUT

VOLTAGE RANGE: 85 ~ 305Vac 120 ~ 430Vdc
FREQUENCY RANGE: 47 ~ 440Hz
EFFICIENCY (Typ.): 84%
AC CURRENT (Typ.): 0.6A/115Vac 0.4A/230Vac 0.3A/277Vac
INRUSH CURRENT (Typ.): COLD START 20A/115Vac 40A/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: 13.8 ~ 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: 10 ~ 500Hz, 2G 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/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 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: 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: 10656.2K hrs min. Telcordia SR-332 (Bellcore) ; 970.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 52.4*27.2*24mm (L*W*H)
PACKING: 0.05Kg/240pcs/13Kg/0.94CUFT

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 complies with 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-20-12 Derating Curve — Derating Curve

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Hand-held electronic device

Downloads

Datasheet1

IRM-20-12 datasheetIRM-20-SPEC.PDF · 2025-11-21 edition PDF Download

Certificates4

EMC Certificate (IRM-20)(EN) PDF Download

UL Certificate (IRM-20)(EN) PDF Download

CB Certificate (IRM-20)(EN) PDF Download

TUV Certificate (IRM-20)(EN) PDF Download

Test reports1

Test Report(IRM-20-12)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-20-12 for 12V PLC accessories, control electronics, or automation modules?

Yes, if the equipment needs a constant 12V input and the total demand stays within 1.8A and 21.6W. That fits many compact PLC accessories, control boards, and automation electronics that run on a 12V DC rail. The wide 85-305VAC input is also useful for equipment deployed across varying mains conditions.

Is the IRM-20-12 suitable for 12V embedded systems with multiple sensors or communication devices?

It can be a good fit when the complete 12V load remains at or below 1.8A and 21.6W. Size the combined draw of all 12V subsystems against that rating before selecting it. Its PCB-mount encapsulated design is aimed at internal integration inside finished equipment.

Can this model power 12V industrial monitoring, HMI support, or panel electronics?

Yes, for compact 12V monitoring and panel electronics that stay within 21.6W. The 52.4 × 27.2 × 24.0 mm package keeps the supply relatively compact for board-level use. It is a better match for moderate 12V loads than for high-current motors, heaters, or other heavier 12V equipment.

Is the IRM-20-12 appropriate for indoor industrial environments with temperature variation?

The rated operating temperature is -30°C to +85°C, with output derating at higher temperatures per the derating curve, which supports many protected industrial environments. No IP rating is listed in the provided specs, so the specs do not verify exposed outdoor suitability. Based on the stated data, it should be treated as an enclosed internal power supply module.

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