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Mean Well RPS-120-27 Green Power Supply 120W 27V 4.5A - Medical Power Supply

4" x 2" compact sizemedical safety approvedno load power consumption < 0.3Wextremely low leakage current

SKU RPS-120-27

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Overview

RPS-120-27 is the 27V output model of this series: typical efficiency 90%.

RPS-120 is a 120W highly reliable green PCB type medical power supply with a high power density on a 4" by 2" footprint. It accepts 80~264VAC input and offers various models with the output voltages between 12V and 48V. The working efficiency is up to 91% and the extremely low no load power consumption is down below 0.3W. RPS-120 is able to be used for both ClassⅠ(with FG) or ClassⅡ(no FG) system design. The extremely low leakage current is less than 190μA. In addition, it conforms to the international medical regulations (2*MOPP) and EMC BS EN/EN55011, perfectly fitting all kinds of BF rated "patient contact" medical system equipment.

Features

4"*2" compact size
Medical safety approved (2 x MOPP) according to ANSI/AAMI ES60601-1 and IEC/BS EN/EN60601-1
Suitable for BF application with appropriate system consideration
84W convection, 120W force air
EMI Class B for both ClassⅠ(with FG) & Class Ⅱ(no FG) configuration
No load power consumption<0.3W
Extremely low leakage current
12V/0.5A fan supply
Protections: Short circuit / Overload / Over voltage / Over temperature
Operating altitude up to 4000 meters
3 years warranty

Specifications

RPS-120-27Specifications from the official datasheet (2026-02-28 edition)

OUTPUT

DC VOLTAGE: 27V
CURRENT 10CFM: 4.5A
CURRENT Convection: 3.15A
RATED POWER 10CFM: 121.5W
RATED POWER Convection: 85W
RIPPLE & NOISE (max.)^Note.2: 150mVp-p
VOLTAGE ADJ. RANGE: 25.6 ~ 28.4V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 30ms/230VAC 500ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.): 50ms/230VAC 10ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 80 ~ 264VAC 113 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 90%
AC CURRENT (Typ.): 2.1A/115VAC 1.2A/230VAC
INRUSH CURRENT (Typ.): COLD START 30A/115VAC 60A/230VAC
LEAKAGE CURRENT(max.)^Note.5: Earth leakage current < 190μA/264VAC , Touch current < 100μA/264VAC

PROTECTION

OVERLOAD: 115~150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 29.7 ~ 35V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Protection type : Shut down o/p voltage, re-power on to recover

FUNCTION

FAN SUPPLY: 12V@0.5A for driving a fan ; tolerance -15% ~ +10% at main output 40% rated current (10CFM)

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, 2G 10min./1cycle, 60min. each along X, Y, Z axes
OPERATING ALTITUDE^Note.6: 4000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 60601-1:2005+A1+A2, TUV BS EN/ EN 60601-1:2006+A1+A12+A2, ANSI/AAMI ES60601-1:2005+A2 CAN/CSA C22.2 No. 60601-1:2014+A2, EAC TP TC 004 approved; Design refer to BS EN/EN60335-1(by request)
ISOLATION RESISTANCE: Primary-Secondary: 2xMOPP, Primary-Earth:1xMOPP, Secondary-Earth:1xMOPP
WITHSTAND VOLTAGE: I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:1.5KVAC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted emission BS EN/EN55011 (CISPR11) Class B
Radiated emission BS EN/EN55011 (CISPR11) Class B
Harmonic current BS EN/EN61000-3-2 Class A
Voltage flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55035,BS EN/EN60601-1-2

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 4, 15KV air; Level 4, 8KV contact
RF field susceptibility BS EN/EN61000-4-3 Level 3, 10V/m( 80MHz~2.7GHz ) Table 9, 9~28V/m( 385MHz~5.78GHz )
EFT bursts BS EN/EN61000-4-4 Level 3, 2KV
Surge susceptibility BS EN/EN61000-4-5 Level 4, 4KV/Line-FG; 2KV/Line-Line
Conducted susceptibility BS EN/EN61000-4-6 Level 3, 10V
Magnetic field immunity BS EN/EN61000-4-8 Level 4, 30A/m
Voltage dip, interruption BS EN/EN61000-4-11 100% dip 1 periods, 30% dip 25 periods, 100% interruptions 250 periods

Parameter	Standard	Test Level
Conducted emission	BS EN/EN55011 (CISPR11)	Class B
Radiated emission	BS EN/EN55011 (CISPR11)	Class B
Harmonic current	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 4, 15KV air; Level 4, 8KV contact
RF field susceptibility	BS EN/EN61000-4-3	Level 3, 10V/m( 80MHz~2.7GHz ) Table 9, 9~28V/m( 385MHz~5.78GHz )
EFT bursts	BS EN/EN61000-4-4	Level 3, 2KV
Surge susceptibility	BS EN/EN61000-4-5	Level 4, 4KV/Line-FG; 2KV/Line-Line
Conducted susceptibility	BS EN/EN61000-4-6	Level 3, 10V
Magnetic field immunity	BS EN/EN61000-4-8	Level 4, 30A/m
Voltage dip, interruption	BS EN/EN61000-4-11	100% dip 1 periods, 30% dip 25 periods, 100% interruptions 250 periods

OTHERS

MTBF: 3732.9K hrs min. Telcordia SR-332 (Bellcore) ; 653.6K hrs min. MIL-HDBK-217F (25℃)
DIMENSION (L*W*H): PCB:101.6*50.8*29mm or 4" * 2" *1.141" inch ; Enclosed type:103.4*62*40mm or 4.07" * 2.44" *1.57" inch
PACKING: PCB:0.15Kg; 72pcs/11.8Kg/0.84CUFT ; Enclosed type:0.24Kg; 60pcs/15.4Kg/1.06CUFT

Test conditions and notes7

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. Derating may be needed under low input voltages. Please check the derating curve for more details.
5. Touch current was measured from primary input to DC output.
6. 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).
7. 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 )

Technical drawings

RPS-120-27 Block Diagram — Block Diagram

RPS-120-27 Derating Curve — Derating Curve

RPS-120-27 Mechanical Specification — Mechanical Specification

RPS-120-27 AC Input Connector (CN1) : JST B3P-VH or equivalent — AC Input Connector (CN1) : JST B3P-VH or equivalent

RPS-120-27 Installation Manual — Installation Manual

Typical applications

Oral irrigator
Hemodialysis machine
Medical monitors
Sleep apnea devices
Pumps machine

Downloads

Certificates7

Mean Well E227340 UL Certificate PDF Download

Mean Well 0147476-EAC Certificate PDF Download

Mean Well RPS-120-TUV Certificate PDF Download

Mean Well RPS-120-CB Certificate PDF Download

Mean Well RPS-120-EMC Certificate PDF Download

Mean Well RPS-120-CE-dec Certificate PDF Download

Mean Well RPS-120-UK-dec Certificate PDF Download

Test reports1

Mean Well RPS-120-27 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the RPS-120-27 for equipment that requires a 27V DC bus?

Yes, if the equipment is designed for constant 27V DC and draws no more than 3.15A (85W) by convection, or 4.5A (121.5W) with a 10CFM fan. This makes it relevant for specialty industrial, embedded, or medical equipment built around a 27V rail.

Is the RPS-120-27 suitable for 27V control electronics or instrumentation?

It can be used for 27V control and instrumentation loads that remain within 3.15A/85W by convection or 4.5A/121.5W with a 10CFM fan. The constant-voltage design is intended for electronics that need a fixed 27V supply.

Can this model power a 27V medical device or lab system?

Yes, provided the device requires 27V DC and stays at or below 3.15A by convection, or 4.5A with a 10CFM fan. The unit is medical safety approved, which is relevant when selecting a power supply for medical equipment designs using a 27V rail.

How well does the RPS-120-27 handle temperature conditions?

The specified operating temperature range is -30°C to +70°C (with output derating per the derating curve), so it is rated for a broad range of indoor equipment conditions. Because no IP rating is listed, it should still be used in protected indoor environments or inside a suitable enclosure.

How does the RPS-120-27 compare with the other RPS-120 versions?

The RPS-120 outputs are 12V (7A convection / 10A with a 10CFM fan), 15V (5.6A / 8A), 24V (3.5A / 5A), 27V (3.15A / 4.5A) and 48V (1.75A / 2.5A), rated 84W by convection and 120W with the fan (85W / 121.5W for 27V). The RPS-120-27 is the 27V PCB-type version, and the RPS-120-27-C keeps the same electrical rating in an enclosed 103.4 × 62.0 × 40.0 mm package.

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