MEAN WELL NPB-240-12AD1 is an adjustable NPB-240 AC/DC battery charger for the 12 V nominal battery class, with AD1 output. Default boost and float voltages are 14.4 V and 13.8 V, and the typical charging current is 13.5 A. Maximum output power is 205.2 W, subject to input-voltage and temperature derating.
Product Datasheet
Download MEAN WELL NPB-240 Datasheet (PDF)
The NPB-240 section is on PDF pages 8, 9, 10, 11, 12, 13, 14. Refer to the complete mechanical drawings and notes when planning installation.
Model and Charging Output
Full ordering model
NPB-240-12AD1; NPB-240 series, 12 V nominal battery class, AD1 output.
Default boost charge voltage
14.4 V.
Default float charge voltage
13.8 V.
Default charging current
13.5 A, typical catalogue output-current setting.
Max. output power
205.2 W; input-voltage and temperature derating apply.
Voltage adjustment
10.5–15.2 V using the front Vo Adj. control.
Charging-current adjustment
6.75–13.5 A (50–100%) using the front Io Adj. control.
Suggested battery capacity
55–180 Ah; confirm the battery manufacturer’s maximum charging current and charging profile.
Typical efficiency
88.5% for this AD1 configuration at the stated default test conditions.
Typical leakage from battery
Less than 1 mA.
The 12 V designation is the nominal battery class, not the actual boost or float charging voltage. Select the charging voltage and current for the specific battery; voltage adjustment does not increase the current limit or maximum available power.
Charging Modes and Status
Factory charging mode
Three-stage charging; the front 3 Stage 2 switch selects two-stage or three-stage operation.
Two-stage profile
Constant current followed by constant voltage at Vfloat; the catalogue diagram marks 10% of CC at the red-to-green transition.
Three-stage profile
Constant current, constant voltage at Vboost, then float at Vfloat. The diagram marks 10% of CC at the transition to float.
Status LED
Red during charging stages 1 and 2; green at stage 3 float or when the battery is full.
The catalogue describes two-stage charging for lithium batteries such as lithium iron and lithium manganese types, and three-stage charging for lead-acid flooded, gel and AGM batteries. Battery specifications may require different settings; confirm compatibility with the battery manufacturer and MEAN WELL.
Input and Protection
Input voltage / frequency
90–264 VAC or 127–370 VDC; AC frequency 47–63 Hz.
AC connection
Class I design with FG; IEC 320-C14 inlet and AC switch.
Power factor / inrush control
Built-in active PFC and active inrush-current limiting; typical PF >0.98 at 115 VAC and >0.95 at 230 VAC, full load.
Typical AC input current
3 A at 115 VAC; 1.5 A at 230 VAC.
Typical cold-start inrush
50 A at 230 VAC.
Input leakage current
Less than 0.75 mA at 240 VAC.
Power consumption with AC switch OFF
Less than 0.15 W.
Short circuit
Constant-current limiting; shutdown after 5 seconds, then re-power to recover. This protection description applies to a short circuit occurring after the charger is turned on.
Overvoltage
16–20 V; output shutdown and latch-off, followed by re-powering to recover.
Overtemperature
Hiccup operation; automatic recovery after the temperature decreases.
Reverse battery polarity
Protection by opening the internal fuse.
Cooling, Environment and Load Limits
Cooling
Fanless free-air convection.
Working temperature
-30°C to +70°C with derating; horizontal installation for the plotted thermal curves.
Horizontal temperature curve
At 100 VAC, 100% load from -30°C to +40°C, then follow the lower curve to 40% at +70°C. At 230 VAC, 100% to +45°C; the upper curve marks 80% at +50°C, 65% at +60°C and 40% at +70°C.
Input-voltage load curve
At 60 Hz: 90% load at 90 VAC, reaching 100% at 100 VAC and remaining at 100% through 264 VAC, before temperature derating.
Working humidity
20–95% RH, non-condensing.
Storage temperature / humidity
-40°C to +85°C; 10–95% RH, non-condensing.
Temperature coefficient
±0.05%/°C from 0°C to +45°C.
Vibration
10–500 Hz, 2 G; 10-minute cycle, 60 minutes each along X, Y and Z.
Apply input-voltage and temperature limits together. Keep the charger’s ventilation path clear; the operating-temperature range is not a full-power rating at every temperature.
Dimensions, Connections and Mounting
Body dimensions, L × W × H
182.7 × 96 × 49 mm; case PS-120F. Drawing dimensions are in mm with ±1 mm tolerance.
Standard output connection
Anderson 1327 red and 1327G6 black housings, or equivalent; Anderson 261G2 (45 A) contacts, or equivalent. Red: +V; black: −V. The contact rating is not the charger output-current rating.
Output cable
100 ±5 cm output cable, as shown for the AD1 version.
Catalogue unit packing reference
1300 g per unit. The separate carton entry is 10 pieces / 14 kg / 1.13 CUFT.
Optional mounting bracket
PGG2MHS012D, ordered separately. The installation uses four brackets per charger; this is an installation quantity, not a stated sales-pack quantity.
Bracket installation drawing
The diagram uses M3 × 4 screws and marks four M3 holes with L=5. The side view marks 106.4 mm between mounting positions and 44.65 mm from the case edge to the first position. See physical catalogue page 13.
Use the indicated positive and negative output connections. The mounting-bracket listing does not specify a separate supplied fastener set; confirm the required mounting hardware with the order.
Factory-Customized DC Connector Options
R7B
Locking male mini-DIN 4-pin; KYCON KPPX-4P equivalent. Pins 1/4 +Vo and 2/3 −Vo; output current <7 A.
XLR3
3-pin XLR; pins 1/2 +Vo and pin 3 −Vo. Output current <10 A.
D3P
DIN 3-pin; pin 1 +Vo, pins 2/3 −Vo; output current <7 A.
D2P
DIN 2-pin; pin 1 −Vo, pin 2 +Vo; output current <5 A.
INL3
DIN 3-pin DC connector; N +Vo, L −Vo; output current <10 A. These are DC plug markings.
C4P
AMP 1-480702-0 (6.35 mm) equivalent; pins 1/2 +Vo and 3/4 −Vo; output current <7 A. FG is not connected to this output connector.
These DC alternatives are available through customization and are separate from this AD1 standard configuration. Match voltage, polarity and the actual selected charging current to the strict connector limits shown; a connector option does not increase available charger power or current.
Safety, EMC and Reliability
Catalogue safety scope
The catalogue lists CB IEC 62368-1 / IEC 60335-1/2-29, Dekra BS EN/EN 62368-1 / BS EN/EN 60335-1/2-29, UL 62368-1, AS/NZS 60335-1/2-29, EAC TP TC 004 and BSMI CNS 15598-1. The cover identifies this configuration as a UL recognized component.
Dielectric withstand
Input–output 3 kVAC; input–FG 2 kVAC; output–FG 0.5 kVAC.
Insulation resistance
100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH.
Emission and mains disturbance
BS EN/EN 55032 (CISPR 32), 55014-1 and CNS 15936: conducted/radiated Class B. Harmonic current: BS EN/EN 61000-3-2 Class A; flicker: 61000-3-3.
Immunity framework
BS EN/EN 55014-2, 55024 and 55035.
ESD / RF / EFT
IEC/EN 61000-4-2: 8 kV air, level 3; 4 kV contact, level 2. -4-3: 3 V/m, level 2. -4-4: 1 kV, level 2.
Surge / conducted RF / magnetic field
IEC/EN 61000-4-5: 1 kV line–line, level 2; 2 kV line–earth, level 3. -4-6: 3 Vrms, level 2. -4-8: 1 A/m, level 1.
Voltage dips / interruptions
IEC/EN 61000-4-11: >95% dip for 0.5 period; 30% dip for 25 periods; >95% interruption for 250 periods.
MTBF references
1284.9 thousand hours minimum, Telcordia TR/SR-332 (Bellcore); 157.5 thousand hours minimum, MIL-HDBK-217F at 25°C.
Catalogue warranty
3 years.
These are the applicable catalogue statements for the charger. The completed equipment and its installation must be rechecked for EMC compliance. Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient.
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