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Mean Well GSM18U48-P1J Power Supply 18W 48V 375mA

Name: Mean Well GSM18U48-P1J Power Supply 18W 48V 375mA
Brand: Mean Well
SKU: GSM18U48-P1J
Price: 20.48 USD
Availability: InStock

SKU GSM18U48-P1J

$20.48 USD

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GSM18U48-P1J

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Product variants

In stock

Overview

GSM18U48-P1J is the 48V output model of this series: rated current 0.375A, typical efficiency 88%.

GSM18U is a highly reliable, 18W wall-mounted style single-output green medical adaptor series. This product is equipped with a 2-pin (no FG) standard USA AC power plug, adopting the input range from 80VAC to 264VAC. The entire series supplies different output voltages between 5VDC and 48VDC that can satisfy the demands for various kinds of miniaturize medical devices. The circuitry design meets the international medical standards (2 × MOPP), having an ultra low leakage current (<50 μA), fitting the medical devices in direct electrical contact with the patients. With the efficiency up to 88% and the extreme low no-load power consumption below 0.1W, GSM18U is compliant with USA EISA 2007/DoE and Canada NRCan; the supreme feature allows the adaptor to save the energy when it is either under the operating mode or the standby mode. The entire series utilizes the 94V-0 flame retardant plastic case, providing the double insulation that effectively prevents electrical shock. GSM18U is approved with the international medical safety certificates.

Features

2 pole USA plug, Class Ⅱ power unit
Medical safety approved (2 × MOPP) according to ANSI/AAMI ES60601-1/-1-11
Extremely low leakage current
No load power consumption<0.1W
Energy efficiency Level Ⅵ ( except 5~9V for Level Ⅴ)
-25~+60℃ wide range working temperature
Protections: Short circuit / Overload / Over voltage
LED indicator for power on
Various DC plug quick adapter accessory available (Plug kit sold seperate, please refer to : https://www.meanwell.com/upload/pdf/DC_plug.pdf)
3 years warranty

Specifications

GSM18U48-P1JSpecifications from the official datasheet (2026-04-03 edition)

OUTPUT

SAFETY MODEL NO.: GSM18U48
DC VOLTAGE^Note.2: 48V
RATED CURRENT: 0.375A
CURRENT RANGE: 0 ~ 0.375A
RATED POWER (max.): 18W
RIPPLE & NOISE (max.)^Note.3: 240mVp-p
VOLTAGE TOLERANCE^Note.4: ±2.0%
LINE REGULATION^Note.5: ±1.0%
LOAD REGULATION: ±2.0%
SETUP, RISE TIME^Note.6: 500ms, 30ms / 230VAC 1000ms, 30ms / 115VAC at full load
HOLD UP TIME (Typ.): 16ms / 230VAC 16ms / 115VAC at full load

INPUT

VOLTAGE RANGE^Note.7: 80 ~ 264VAC 113 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 88%
AC CURRENT (Typ.): 0.5A / 115VAC 0.25A / 230VAC
INRUSH CURRENT (Typ.): 55A / 230VAC 30A / 115VAC
LEAKAGE CURRENT(max.): Touch current < 50μA/264VAC

PROTECTION

OVERLOAD: 105 ~ 170% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 50.4 ~ 64.8V Protection type : Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: -25 ~ +60℃ (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% / ℃ (0~40℃)
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note. 8)

SAFETY STANDARDS: IEC 60601-1:2005+A1+A2; IEC 60601-1-11:2015+A1, ANSI/AAMI ES60601-1:2005+A2; ANSI/AAMI HA60601-1-11+A1 CAN/CSA C22.2 No. 60601-1:2014+A2; CSA C22.2 NO. 60601-1-11:2015+A1, EAC TP TC 004 approved
ISOLATION LEVEL: Primary-Secondary: 2xMOPP
WITHSTAND VOLTAGE: I/P-O/P:4KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted emission FCC PART 15 / CISPR22 Class B
Radiated emission FCC PART 15 / CISPR22 Class B

Parameter	Standard	Test Level
Conducted emission	FCC PART 15 / CISPR22	Class B
Radiated emission	FCC PART 15 / CISPR22	Class B

OTHERS

MTBF: 3889.1K hrs min. Telcordia SR-332 (Bellcore) ; 794.6K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 79*54*33mm (L*W*H)
PACKING: 185g ; 60pcs / 12.1Kg / CARTON

CONNECTOR

PLUG: See page 4~5 ; Other type available by customer requested
CABLE: See page 4~5 ; Other type available by customer requested

Test conditions and notes8

1. All parameters are specified at 115VAC input, rated load, 25℃ 70% RH ambient.
2. DC voltage: The output voltage set at point measure by plug terminal & 50% load.
3. Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1μF & 47μF capacitor.
4. Tolerance: includes set up tolerance, line regulation, load regulation.
5. Line regulation is measured from low line to high line at rated load.
6. Length of set up time is measured at first cold start. Turning ON/OFF the power supply may lead to increase of the set up time.
7. Derating may be needed under low input voltage. Please check the derating curve for more details.
8. 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

GSM18U48-P1J Derating Curve — Derating Curve

GSM18U48-P1J Mechanical Specification — Mechanical Specification

GSM18U48-P1J DC output plug — DC output plug

GSM18U48-P1J G S M 1 8 U series — G S M 1 8 U series

Typical applications

Blood glucose meter
Blood pressure meter
Nebulizer
Inhale
Portable medical device

Downloads

Datasheet1

GSM18U48-P1J datasheetGSM18U-SPEC.PDF · 2026-04-03 edition PDF Download

Certificates5

EMC Certificate (ELG-75)(EN) PDF Download

UL Certificate (GSM18U)(EN) PDF Download

FCC Certificate (GSM18U)(EN) PDF Download

CB Certificate(GSM18U)(EN) PDF Download

NRCAN Certificate(GSM18U)(EN) PDF Download

Test reports1

Test Report(GSM18U48-P1J)(EN) PDF Download

Catalogues3

Mean Well Medical Catalog PDF Download

Mean Well Adaptor Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the GSM18U48-P1J for low-power 48V industrial control equipment?

Yes, it is a constant-voltage 48V supply rated for 18W and 0.375A, so it fits low-power 48V industrial or automation loads that stay within those limits. It is better suited to control, sensing, or communications hardware than to larger 48V equipment with higher current demand.

Is the GSM18U48-P1J suitable for 48V embedded or networking devices?

It can be a fit for embedded or IT hardware that requires a steady 48V DC input and draws no more than 0.375A. Its wide 80-264VAC input also helps when the same product may be used across different AC mains ranges.

Can this 48V power supply run small automation or access-control electronics?

It is appropriate for smaller 48V constant-voltage devices used in automation or control systems when the total load stays within 18W. For equipment with startup or continuous demand above 0.375A, this model would be undersized.

How do I know if the GSM18U48-P1J is the right size for my 48V device?

Match it to equipment that requires 48V constant-voltage input and draws up to 0.375A, with total power up to 18W. If your load needs more current or more than 18W, you need a higher-capacity 48V model.

Is the GSM18U48-P1J suitable for outdoor or harsh-environment use?

The provided specs list an operating temperature range of -25°C to +60°C, but no IP rating is given. That means temperature capability is stated, but suitability for exposed outdoor, wet, or dust-heavy locations is not established by the listed specs.

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