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Mean Well 321.3W High Reliable Multi-Industries Power Supply 27V 11.9A

Name: Mean Well 321.3W High Reliable Multi-Industries Power Supply 27V 11.9A
Brand: Mean Well
SKU: NSP-320-27
Price: 47.35 USD
Availability: InStock

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Overview

NSP-320-27 is the 27V output model of this series: rated current 11.9A, rated power 321.3W, typical efficiency 93.5%.

The NSP-320 series is a 320W AC/DC power supply with PFC function, designed for high reliability and suitable for multiple industries. Key features include: compact size (179*99*30 mm) for better space utilization in system installations, ultra-wide input range of 85~305Vac for global compatibility, up to 93.5% efficiency and low standby power consumption (<0.3W~0.5W by models) for energy-saving and carbon reduction, constant current design with 200% peak power capability, wide operating temperature range from -40 to +85℃(+60℃ at full load), compliance with OVC Ⅲ, built-in Remote Control /Remote Sense/DC OK signal, internal PCB coating, complete protections, certifications for multiple safety standards including 62368-1, 60601-1, 61558-1, 60335-1, 62477-1, and 61010-1, as well as 2 X MOPP compliance and extremely low leakage current (<350μA). It is suitable for BF-rated medical equipment and comes with a 5-years warranty, making it a highly cost-effective solution for industrial power supply needs.

Features

85~305Vac input with PFC(277Vac available)
No load power consumption <0.3W~0.5W by R.C.
Global certificates in multi-fields (ITE 62368-1, Medical 60601-1, Household 60335-1, Industrial 61558-1/2-16/61010-1, Energy converter 62477-1)
200% peak power capability(12~60V models)
High efficiency up to 93.5%
-40~85℃ wide range operation temperature(> +60℃ derating)
Extremely low leakage current<350μA, 2 x MOPP, suitable for BF medical applications
Built-in constant current limiting circuit
Protections: Short circuit / Overload / Over voltage / Over temperature
Forced air cooling by built-in DC fan with noise <40dB and fan ON/OFF control
Built-in remote ON/OFF control/Remote Sense/ DC OK signal
Over voltage category Ⅲ (OVC Ⅲ)
Operating altitude up to 5000 meters
Conformal coating
5 years warranty

Specifications

NSP-320-27Specifications from the official datasheet (2026-09-17 edition)

OUTPUT

DC VOLTAGE: 27V
RATED CURRENT: 11.9A
CURRENT RANGE: 0 ~ 11.9A
RATED POWER: 321.3W
PEAK CURRENT(5 sec.): 23.7A
PEAK POWER(5 sec.): 640W
RIPPLE & NOISE (max.)^Note.2: 240mVp-p
VOLTAGE ADJ. RANGE: 26 ~ 32V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME: 1500ms, 80ms/115Vac 1000ms, 80ms/230Vac 1000ms, 80ms/277Vac
HOLD UP TIME (Typ.): 16ms at full load

INPUT

VOLTAGE RANGE^Note.4: 85 ~ 305Vac 120 ~ 431Vdc
NO LOAD POWER CONSUMPTION(Typ.) Remote Power OFF: 0.3W/115Vac 0.5W/230Vac 0.5W/277Vac
NO LOAD POWER CONSUMPTION(Typ.) Remote Power ON: 3W/115Vac 3W/230Vac 3W/277Vac
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF>0.98/115Vac, PF>0.93/230Vac, PF>0.9/277Vac at full load
EFFICIENCY (Typ.): 93.5%
AC CURRENT (Typ.): 3.2A/115Vac 1.6A/230Vac 1.4A/277Vac
INRUSH CURRENT (Typ.): COLD START 20A/115Vac 40A/230Vac 50A/277Vac
LEAKAGE CURRENT: Earth leakage current <350μA(rms)@277Vac, touch current<100μA(rms) @ 277Vac

PROTECTION

SHORT CIRCUIT 5V: Hiccup mode,recovers automatically after fault condition is removed
SHORT CIRCUIT 7.5V ~ 60V: Constant current limiting for more than 5 seconds (Vout<30%) and then shut down o/p voltage, AC re-power on to recover
OVERLOAD 5V: 105%~170% rated output power; Hiccup mode,recovers automatically after fault condition is removed
OVERLOAD 7.5V: 105%~150% rated output power; Constant current limiting for more than 5 seconds and then shut down o/p voltage, AC re-power on to recover
OVERLOAD 12V ~ 60V: Normally works within 105 ~ 200% rated output power for more than 5 seconds and then constant current limiting without shutdown(Vout>30%), recovers automatically after fault condition is removed, or shut down o/p voltage when Vout<30%,AC re-power on to recover >200% rated power, constant current limiting (Vout>30%)with auto-recovery after fault condition is removed, or shut down o/p voltage when Vout<30%,AC re-power on to recover
OVER VOLTAGE: 33~ 42V Protection type : Shut down o/p voltage, AC re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, AC re-power on to recover

FUNCTION

REMOTE CONTROL: POWER ON: RC+~RC- 0~0.8Vdc or open POWER OFF: RC+~RC- 3.3~10Vdc by external voltage
REMOTE SENSE: Compensate voltage drop on the load wiring up to 0.3V. Please refer to the Function Manual
DC OK SIGNAL: By phototransistor, contact rating(max.):15Vdc/10mA resistive load. Please refer to the Function Manual.
FAN NOISE(Typ.): Fan ON/OFF control, RTH3≥50℃±10℃ FAN ON;RTH3≤40℃±10℃ FAN OFF 40dB

ENVIRONMENT

WORKING TEMP.: -40 ~ +85℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.05%/℃ (0 ~ 60℃)
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.5&6&7)

SAFETY STANDARDS: CB IEC62368-1, IEC60335-1, IEC61558-1/-2-16, IEC61010-1/-2-201, IEC60601-1; IEC62477-1 DEKRA BS EN/EN62368-1, BS EN/EN60335-1, BS EN/EN61558-1/-2-16, BS EN/EN61010-1/-2-201, BS EN/EN60601-1(3.2 Version);BS EN/EN62477-1 UL UL62368-1, ANSI/AAMI ES60601-1(3.2 Version),UL61010-1/-2-201 CCC GB4943.1 BSMI CNS15598-1 EAC TP TC 004 SEMI F47 approved; KC/BIS KC62368-1 and BIS IS 13252 (Part 1) certified, No stock ,contact sales by request
ISOLATION LEVEL^Note.8: Primary-Secondary: 2xMOPP, Primary-Earth: 1xMOPP, Secondary-Earth: 1xMOPP
OVER VOLTAGE CATEGORY^Note.9: IEC/EN 61558-1/-2-16 (OVC Ⅲ , altitude up to 2000M) IEC/EN/UL 62368-1 (OVC Ⅱ, altitude up to 5000M) IEC/EN 60335-1 (OVC Ⅱ, altitude up to 5000M) IEC/EN/ANSI/AAMI ES60601-1 (OVC Ⅱ, altitude up to 4000M) IEC/EN/UL 61010-1/-2-201 (OVC Ⅱ, altitude up to 5000M) IEC/EN 62477-1 (OVC Ⅱ, altitude up to 5000M)
SAFETY EXTRA-LOW VOLTAGE(SELV): IEC/EN 61558-2-16 (SELV, 5 ~ 36V) IEC/EN 60335-1 (SELV, 5 ~ 36V) IEC/EN/UL 62368-1 (SELV/ES1, 5 ~ 36V)
WITHSTAND VOLTAGE: I/P-O/P:4.2KVac I/P-FG:2.1KVac 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: BS EN/EN55032(CISPR32),CNS 15936, GB/T 9254.1,KS C 9832, BS EN/EN55014-1(CISPR14-1), BS EN/EN55011(CISPR11)

Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32),CNS 15936, GB/T 9254.1,KS C 9832, BS EN/EN55014-1(CISPR14-1) Class B
Conducted BS EN/EN55011(CISPR11) Class B
Radiated BS EN/EN55032(CISPR32),CNS 15936, GB/T 9254.1,KS C 9832, BS EN/EN55014-1(CISPR14-1) Class B
Radiated BS EN/EN55011(CISPR11) Class B
Harmonic Current BS EN/ EN61000-3-2(IEC61000-3-2), GB 17625.1 Class A
Voltage Flicker BS EN/ EN61000-3-3(IEC61000-3-3) -----
EMC IMMUNITY: BS EN/EN55035(CISPR35), BS EN/EN61000-6-2(IEC61000-6-2),BS EN/EN60601-1-2(IEC60601-1-2), BS EN/EN55014-2(CISPR14-2),KS C 9835,SEMI F47 tested at 200Vac

Parameter Standard Test Level

ESD BS EN/ EN61000-4-2 Level 4, 15KV air; Level 4, 8KV contact
Radiated BS EN/ EN61000-4-3 Level 3, 10V/m(80MHz~2.7GHz) Table 9, 9~28V/m(385MHz~5.78GHz)
EFT / Burst BS EN/ EN61000-4-4 Level 3, 2KV
Surge BS EN/ EN61000-4-5 Level 4, 2KV/Line-Line 4KV/Line-Earth
Conducted BS EN/ EN61000-4-6 Level 3, 10V
Magnetic Field BS EN/ EN61000-4-8 Level 4, 30A/m
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),CNS 15936, GB/T 9254.1,KS C 9832, BS EN/EN55014-1(CISPR14-1)	Class B
Conducted	BS EN/EN55011(CISPR11)	Class B
Radiated	BS EN/EN55032(CISPR32),CNS 15936, GB/T 9254.1,KS C 9832, BS EN/EN55014-1(CISPR14-1)	Class B
Radiated	BS EN/EN55011(CISPR11)	Class B
Harmonic Current	BS EN/ EN61000-3-2(IEC61000-3-2), GB 17625.1	Class A
Voltage Flicker	BS EN/ EN61000-3-3(IEC61000-3-3)	-----

Parameter	Standard	Test Level
ESD	BS EN/ EN61000-4-2	Level 4, 15KV air; Level 4, 8KV contact
Radiated	BS EN/ EN61000-4-3	Level 3, 10V/m(80MHz~2.7GHz) Table 9, 9~28V/m(385MHz~5.78GHz)
EFT / Burst	BS EN/ EN61000-4-4	Level 3, 2KV
Surge	BS EN/ EN61000-4-5	Level 4, 2KV/Line-Line 4KV/Line-Earth
Conducted	BS EN/ EN61000-4-6	Level 3, 10V
Magnetic Field	BS EN/ EN61000-4-8	Level 4, 30A/m
Voltage Dips and Interruptions	BS EN/ EN61000-4-11	>95% dip 0.5 periods, 30% dip 25 periods, >95% interruptions 250 periods

OTHERS

MTBF: 1699.1K hrs min. Telcordia SR-332 (Bellcore) ; 257.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION (L*W*H): 179*99*30mm
PACKING: 0.67Kg; 18pcs/12.5Kg/0.65CUFT

Test conditions and notes9

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 0.1uF & 47uF parallel capacitor.
3. Tolerance: includes set up tolerance, line regulation and load regulation.
4. Derating may be need under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
5. The Regulatory Compliance Mark (RCM) is applied on a voluntary basis. The equipment meets the relevant IEC or AS/NZS standards, or AS/NZS 3820 where applicable. The use of the RCM mark complies with AS/NZS 4417.1.
6. 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)
7. Some factory or model may not have the BIS logo, please contact your MEAN WELL sales for more information.
8. MOPP is suitable for 100-240Vac input only
9. The ambient temperature derating of 3.5℃/1000m with fanless models and 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

NSP-320-27 Block Diagram — Block Diagram

NSP-320-27 Derating Curve — Derating Curve

NSP-320-27 P pk x t + Pnpk x (T-t) — P pk x t + Pnpk x (T-t)

NSP-320-27 2.Remote Control — 2.Remote Control

NSP-320-27 3.Remote Sense — 3.Remote Sense

NSP-320-27 4.DC_OK signal — 4.DC_OK signal

NSP-320-27 Mechanical Specification — Mechanical Specification

NSP-320-27 Accessory List — Accessory List

NSP-320-27 Installation Diagram — Installation Diagram

Typical applications

Industrial automation machinery/ control system
Security system
Mechanical and electrical equipment
Electronic instruments, equipments or apparatus
Network equipment
Telecom devices
Power sourcing equipment of PoE
Home automation
Medical devices
Charging application

Downloads

Datasheet1

NSP-320-27 datasheetNSP_320_spec.pdf · 2026-09-17 edition PDF Download

FAQ

What is the main use case for the Mean Well NSP-320-27 power supply?

The Mean Well NSP-320-27 is a 321.3W enclosed AC/DC power supply built for demanding multi-industry equipment. It is suitable for industrial automation, mechanical equipment, medical devices, security systems, telecommunications, PoE power sourcing, and charging systems where a regulated 27V output is needed.

What output does the NSP-320-27 provide?

This model provides a nominal 27V DC output with a rated current of 11.9A. Its power rating is 321.3W, making it a fit for systems that need a higher-power 27V supply in a compact enclosed form factor.

Is the NSP-320-27 designed for harsh industrial environments?

Yes. The NSP-320-27 is specified for operation from -40°C to +85°C, with derating above +60°C, and it uses forced-air cooling with a built-in DC fan for thermal stability. It also has a conformal coated PCB and supports high-altitude installations up to 5000 meters under the stated overvoltage category conditions.

Can the NSP-320-27 be used in medical or high-reliability equipment?

Yes, this series is built for high-reliability applications and includes compliance with IEC/EN/UL 60601-1 with 2 x MOPP. The product description also notes very low leakage current and suitability for BF-rated medical applications, which makes it relevant for certain medical equipment designs.

How energy efficient is the Mean Well NSP-320-27?

The NSP-320 series reaches efficiency up to 93.5% and includes built-in active PFC. It also has very low no-load power consumption, listed as below 0.3-0.5W, which helps reduce standby energy use in always-on systems.

What protection and monitoring features are included in the NSP-320-27?

This model includes constant current limiting and protection functions for short circuit, overload, overvoltage, and overtemperature. It also provides remote ON/OFF control, remote sense with up to 0.3V compensation, a DC OK signal, and fan ON/OFF temperature control for system-level monitoring and reliability.

Why choose the NSP-320-27 over a general-purpose 27V power supply?

The NSP-320-27 is differentiated by its high-reliability design, broad safety certifications, wide operating temperature range, active PFC, and support for demanding industrial and medical-oriented environments. It also offers 200% peak power capability within the NSP-320 series for 12-60V models, which can be useful in applications with short-duration peak load demands.

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