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Mean Well RPS-120S-27 Green Power Supply 119.9W 27V 4.44A - Medical Power Supply

3" x 2" compact sizemedical safety approved150W peak for 10sno load power consumption<0.3Wextremely low leakage current

SKU RPS-120S-27

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Overview

RPS-120S-27 is the 27V output model of this series: typical efficiency 94%.

RPS-120S is a 120W highly reliable green PCB type medical power supply with a high power density on a 3" 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 94% and the extremely low no load power consumption is down below 0.3W. RPS-120S is able to be used for both ClassⅠ(with FG) & ClassⅡ(no FG) system design. The extremely low leakage current is less than 150 μA. 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

3"×2" compact size
120W convection, 150W peak (10sec.)
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
EMI for both ClassⅠ& Class Ⅱ configuration
-30~+85℃ wide range operating temperature
No load power consumption<0.3W
Extremely low leakage current
Protections: Short circuit / Overload / Over voltage / Over temperature
Operating altitude up to 4000 meters (Note.6)
3 years warranty

Specifications

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

OUTPUT

DC VOLTAGE: 27V
CURRENT Peak(10 sec.): 5.55A
CURRENT Convection: 4.44A
RATED POWER Peak(10 sec.): 149.8W
RATED POWER Convection: 119.9W
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: 600ms, 30ms/230VAC 600ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.): 15ms/230VAC 15ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 80 ~ 264VAC 113 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR: PF>0.94/230VAC PF>0.98/115VAC at full load
EFFICIENCY (Typ.): 94%
AC CURRENT (Typ.): 2.3A/115VAC 1.1A/230VAC
INRUSH CURRENT (Typ.): COLD START 30A/115VAC 60A/230VAC
LEAKAGE CURRENT(max.)^Note.5: Earth leakage current < 150μA/264VAC , touch current < 100μA/264VAC

PROTECTION

OVERLOAD: 130~160% 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, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.: -30 ~ +85℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP.: -40 ~ +85℃
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, O/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) ClassⅠ: Class B , Class Ⅱ: Class A
Harmonic current BS EN/EN61000-3-2 Class A
Voltage flicker BS EN/EN61000-3-3
EMC IMMUNITY: 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 95% dip 1 periods, 30% dip 25 periods, 95% interruptions 250 periods

Parameter	Standard	Test Level
Conducted emission	BS EN/EN55011 (CISPR11)	Class B
Radiated emission	BS EN/EN55011 (CISPR11)	ClassⅠ: Class B , Class Ⅱ: Class A
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	95% dip 1 periods, 30% dip 25 periods, 95% interruptions 250 periods

OTHERS

MTBF: 4050.3K hrs min. Telcordia SR-332 (Bellcore) ; 468.0K hrs min. MIL-HDBK-217F (25℃)
DIMENSION (L*W*H): 76.2*50.8*28mm or 3" * 2" *1.1" inch
PACKING: 0.13Kg; 100pcs/14Kg/1.13CUFT

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-120S-27 Block Diagram — Block Diagram

RPS-120S-27 Mechanical Specification — Mechanical Specification

Typical applications

Oral irrigator
Hemodialysis machine
Medical monitors
Sleep apnea devices
Pumps machine

Downloads

Certificates6

Mean Well 0147476-EAC Certificate PDF Download

Mean Well RPS-120S-TUV Certificate PDF Download

Mean Well RPS-120S-CB(UL) Certificate PDF Download

Mean Well RPS-120S-EMC Certificate PDF Download

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

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

Test reports1

Mean Well RPS-120S-27 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the RPS-120S-27 for 27V industrial control or automation equipment?

Yes, it is a constant voltage 27V supply rated for 4.44A and 119.9W. It is intended for equipment that specifically requires a regulated 27V DC source within those output limits.

Is the RPS-120S-27 a good choice for compact embedded systems with a 27V bus?

It can be a good fit where space is tight because the unit measures 76.2 x 50.8 x 28.0 mm. The output is fixed at 27V constant voltage with up to 4.44A available for embedded hardware built around a 27V rail.

Can this model support 27V loads with brief peak demand?

Yes, the supply is rated for 119.9W continuous output and allows 149.8W peak for 10s. That can help in applications where the 27V load has a short-duration surge above normal running demand.

Can the RPS-120S-27 be used in outdoor cabinets or exposed locations?

No IP rating is listed for this model, so it is better treated as an indoor or protected-enclosure power supply rather than an exposed outdoor unit. The operating temperature range is -30°C to +85°C, but environmental protection still depends on the enclosure around it.

How does the RPS-120S-27 differ from the other RPS-120S versions?

The RPS-120S series includes 12V at 9.5A and 114W, 15V at 7.6A and 114W, 24V at 5A and 120W, 27V at 4.44A and 119.9W, and 48V at 2.5A and 120W. The 27V version sits between the 24V and 48V options in output voltage while keeping the same compact family format.

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