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Mean Well NTS-400P-212 True Sine Wave DC-AC Inverter 400W 230V out 12V in

fanless designhigh efficiency up to 93%200% peak power capabilitybuilt-in dip switch to adjust AC output voltagefrequency and work mode

SKU NTS-400P-212

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Overview

NTS-400P-212 is the model of this series: typical efficiency 91%.

NTS-400P is a 400W highly reliable built-in type off-grid true sine wave DC-AC power inverter. Its key features include: digital design with MCU control, streamlined control circuitry that quickly responds to environmental changes and improves reliability, compact size, light weight, 800W peak power, adjustable AC output voltage and frequency, -20~+70℃ wide operating temperature range, built-in remote ON/OFF control, low no-load power consumption (energy saving mode < 1.5W max. ), complete protection features, and etc. Combined with batteries, the NTS-400P is suitable for use in residential, commercial, marine, automobile, and remote areas with no access to utility power, and the output can be used to power fans, TV, radio, phone charger, PC/laptop, lighting, outdoor camping equipment, marine AC power, and etc.

Features

Compact size and light weight
True sine wave output (THD<3%)
High surge power up to 800W
250W convection, 400W forced air
AC output voltage and frequency selectable by DIP S.W
No load dissipation <1.5W max. at standby saving mode
-20℃~+70℃ wide operating temperature
Power ON-OFF remote control
Protections : Input : Reverse polarity / DC low alarm / DC low shutdown / Over voltage Output : Short circuit / Overload / Over temp.
Battery over discharge protection (Low voltage disconnect)
Suitable for lead-acid or li-ion batteries
Support Tx/Rx for monitoring power inverter status
Conformal coating
3 years warranty

Specifications

NTS-400P-212Specifications from the official datasheet (2026-03-26 edition)

AC OUTPUT

RATED POWER(Continuous): 400W
OVER RATED POWER(3 Min.): 460W
PEAK POWER(10 Sec.): 600W
SURGE POWER(30 Cycles): 800W
AC VOLTAGE: Default setting set at 230VAC 200 / 220 / 230 / 240Vac selectable by DIP S.W
FREQUENCY: Default setting set at 50Hz±0.1Hz 50/60Hz selectable by DIP S.W
WAVEFORM^Note.1: True sine wave (THD<3%)
AC REGULATION: ±3.0% at rated output voltage
LED STATUS: Please refer to page3

DC INPUT

DC VOLTAGE: 12V
VOLTAGE RANGE (Typ.): 10 ~ 16.5Vdc
DC CURRENT (Typ.): 40A
NO LOAD DISSIPATION (Typ.) Non-Saving mode: 10W
NO LOAD DISSIPATION (Typ.) Saving mode: Default disable, ≦1.2W ~ 1.5W by models @ auto detec AC output load ≦10W will be changed to saving mode
NO LOAD DISSIPATION (Typ.) Saving mode: 1.2W
OFF MODE CURRENT DRAW: <1mA at battery ~DC input must be disconnected
EFFICIENCY (Typ.)^Note.1: 91%
BATTERY TYPES: Lead Acid or Li-ion

PROTECTION

FUSE(Internal): 40A*2
DC INPUT LOW ALARM: 11±0.3Vdc
DC INPUT LOW SHUTDOWN: 10±0.3Vdc
DC INPUT LOW RESTART: 12.5±0.3Vdc
DC INPUT HIGH ALARM: 15.5±0.3Vdc
DC INPUT HIGH SHUTDOWN: 16.5±0.3Vdc
DC INPUT HIGH RESTART: 15±0.3Vdc
BAT. POLARITY: By internal fuse open
OVER TEMPERATURE: Protection type : Shut down o/p voltage, re-power on to recover
OUTPUT SHORT: Protection type : Shut down o/p voltage, re-power on to recover
OVER LOAD (Typ.): 105 ~ 115% load for 180 sec., 115% ~ 150% load for 10 sec. Protection type : Shut down o/p voltage, re-power on to recover

FUNCTION

REMOTE CONTROL: Power ON-OFF remote control by front panel dry contact connector (by RELAY), Open : Normal work ; Short : Remote off
Tx/Rx: Support Tx/Rx for monitoring power inverter status

ENVIRONMENT

WORKING TEMP.: -20 ~ +70℃(Refer to “Derating curve”)
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -30 ~ +70℃ / -22 ~ +158℉, 10 ~ 95% RH non-condensing
VIBRATION: 10 ~ 500Hz, 3G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.4)

SAFETY STANDARDS: CB IEC62368-1 2ed, CSA/UL 62368-1 3ed for all models; E13, EAC TPTC004, AS/NZS 62368.1 for NTS-400P-212/224/248 approved (Please refer to next page “Safety overview” table for more details)
WITHSTAND VOLTAGE: DC I/P - AC O/P:3.0KVac AC O/P - FG:1.5KVac
EMC EMISSION: Parameter Standard Test Level

Radiated FCC for 112,124,148 only Class A
Radiated BS EN/EN55032(CISPR32) for 212,224,248 only Class A
Harmonic Current BS EN/EN61000-3-2
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55024, BS EN/EN55035

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
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m

Parameter	Standard	Test Level
Radiated	FCC for 112,124,148 only	Class A
Radiated	BS EN/EN55032(CISPR32) for 212,224,248 only	Class A
Harmonic Current	BS EN/EN61000-3-2
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
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m

OTHERS

MTBF: 836.2K hrs min. Telcordia TR/SR-332 (Bellcore) ; 84K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 186*100.5*34mm (L*W*H)
PACKING: 0.75Kg; 18pcs/ 14.5Kg/ 1.01CUFT

Test conditions and notes4

1.Efficiency, AC regulation and THD are tested by 400W, linear load at 12.5Vdc/25Vdc/50Vdc input voltage.
2.All parameters not specified above are measured at rated load, 25℃ of ambient temperature and set to factory setting.
3.Internal pre-start circuit, the setup time is 8s.
4.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

NTS-400P-212 Safety Overview — Safety Overview

NTS-400P-212 Block Diagram — Block Diagram

NTS-400P-212 DERATING CURVE — DERATING CURVE

NTS-400P-212 Remote ON-OFF Control — Remote ON-OFF Control

NTS-400P-212 AC output voltage、Frequency、Power — AC output voltage、Frequency、Power

NTS-400P-212 MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

NTS-400P-212 Accessory List — Accessory List

NTS-400P-212 TYPICAL APPLICATION — TYPICAL APPLICATION

Typical applications

Downloads

Certificates7

Mean Well NTS-250P-400P-ICES Certificate PDF Download

Mean Well NTS-250P-400P-CB Certificate PDF Download

Mean Well NTS-250P-400P-E13 Certificate PDF Download

Mean Well NTS-250P-400P-FCC Certificate PDF Download

Mean Well NTS-250P-400P-EMC Certificate PDF Download

Mean Well NTS-250P-400P-CE-dec Certificate PDF Download

Mean Well NTS-250P-400P-UK-dec Certificate PDF Download

Test reports1

Mean Well NTS-400P-212 Test Report PDF Download

FAQ

What is the Mean Well NTS-400P-212 designed for?

The NTS-400P-212 is a 400W true sine wave DC-AC inverter that converts 12V DC input to 230V AC output. It is intended for applications that need clean AC power from a 12V battery-based power source. This makes it suitable for professional mobile, industrial, and backup power use where output quality matters.

Does this model provide true sine wave output?

Yes, the NTS-400P-212 provides a true sine wave output with total harmonic distortion below 3%. That cleaner waveform is important for equipment that is sensitive to power quality. Compared with modified sine wave inverters, it is better suited to loads that require stable AC output.

What input and output ratings does the NTS-400P-212 have?

This model is rated for 12V DC input (10 to 16.5VDC range) and 230V AC output, with a 400W continuous power rating. It also supports surge power up to 800W for short-duration demand. The derating curve gives separate ratings for natural convection and forced air with a 10CFM fan.

Can the AC output voltage and frequency be selected on this inverter?

Yes, the NTS-400P-212 supports selectable AC output voltage and frequency by DIP switch. The AC voltage options for this model are 200/220/230/240VAC, and the frequency can be set to 50Hz or 60Hz. The factory default is 230V AC at 50Hz.

Is the NTS-400P-212 compatible with different battery types?

Yes, this inverter is stated as suitable for both lead-acid and lithium-ion batteries. It also includes DC input low-voltage protection, with an alarm at 11V and shutdown at 10V. That makes it a practical option for systems using either traditional or modern battery chemistries.

What protection features are included in this inverter?

The NTS-400P-212 includes protection for output short circuit and overload, plus DC input low and high voltage alarm and shutdown and polarity protection by internal fuse. It also has an over-temperature shutdown behavior that requires re-powering to recover. These protections help safeguard both the inverter and connected equipment during abnormal operating conditions.

Can this inverter be used in demanding environmental conditions?

Yes, this model is built for a wide operating temperature range of -20°C to +70°C, with derating per the manufacturer's curve. It is also rated for 20% to 90% RH non-condensing humidity and 10 to 500Hz, 3G vibration. Buyers needing compact hardware should also note its 186 x 100.5 x 34 mm size and 0.75 kg weight.

Does the NTS-400P-212 support remote control or status monitoring?

Yes, the product supports remote power on-off control. It also supports Tx/Rx communication for monitoring inverter status. That makes it useful in systems where centralized status visibility or remote operation is important.

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Model	Power	Voltage	Waveform	Frequency
Mean Well NTS-400P-224 True Sine Wave DC-AC Inverter 400W 230V out 24V in	400W	230V	True Sine Wave	50Hz	View
Mean Well NTS-400P-248 True Sine Wave DC-AC Inverter 400W 230V out 48V in	400W	230V	True Sine Wave	50Hz	View

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