MEAN WELL GST120A48-P1M is a single-output desktop AC/DC power adapter rated at 48 VDC, 2.5 A and 120 W. It has a P1M DC output plug and a 3-pole IEC320-C14 inlet with Class I protective earthing. Apply the input-voltage and temperature derating limits below.
Product Datasheet
Download MEAN WELL GST120A Datasheet (PDF)
The GST120A section is on PDF pages 71, 72, 73, 74, 75. Refer to the complete mechanical drawings and notes when planning installation.
Model and Selection
Complete model
GST120A48-P1M.
Series
GST120A industrial desktop adapter.
Input construction
Class I; 3-pole IEC320-C14, with FG.
DC termination
Center positive; 5.5 mm OD × 2.5 mm ID × 11 mm length, tuning-fork style.
Power conversion
Universal input with built-in active PFC.
Enclosure and indication
Fully enclosed 94V-0 flame-retardant plastic case; LED power-on indicator.
No-load consumption
<0.15 W.
Energy efficiency
Level VI.
Select the complete model, output voltage, current capacity, connector and polarity for the load. A matching connector shape alone does not establish electrical compatibility.
Output Ratings
Nominal output
48 VDC.
Rated current
2.5 A.
Output current range
0–2.5 A.
Rated output power, maximum
120 W.
Ripple and noise, maximum
200 mVp-p.
Voltage tolerance
±2.5%.
Line regulation
±1.0%.
Load regulation
±2.5%.
Efficiency, typical
90.5% for this P1M version.
Observe the stated current and power limits together. Unless otherwise specified, measurements use 230 VAC, rated load, 25°C and 70% RH. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Line regulation is measured from low to high input at rated load.
Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors.
Input and Timing
AC input
85–264 VAC; 47–63 Hz.
DC input
120–370 VDC.
Power factor, typical
PF >0.93 at 230 VAC and PF >0.97 at 115 VAC, at full load.
AC current
1.4 A at 115 VAC; 0.7 A at 230 VAC.
Cold-start inrush, maximum
35 A at 115 VAC; 70 A at 230 VAC.
Set-up / rise time
2000 ms / 30 ms at 230 VAC; 2500 ms / 30 ms at 115 VAC, at full load.
Hold-up time, typical
20 ms at both 230 VAC and 115 VAC, at full load.
Leakage current, maximum
0.75 mA at 240 VAC.
Set-up time is measured at the first cold start. Repeated power switching may increase the set-up time. Apply the low-input derating curve.
Protection
Short circuit / overload
105–160% of rated output power. Hiccup mode; automatic recovery after fault removal.
Overvoltage
105–135% of rated output voltage. Output shutdown; reapply input power to recover.
Overtemperature
Output shutdown; reapply input power to recover.
Cooling and Environment
Working ambient
−30 to +70°C, subject to the model-specific derating curves.
Temperature derating
Horizontal installation: at 230 VAC, full load through 45°C, decreasing to 50% at 70°C. At 100 VAC, full load through 40°C, decreasing to 50% at 60°C; that lower-input curve ends at 60°C.
Input-voltage derating
At 60 Hz, 85% load at 85 VAC, rising to 100% at 100 VAC and remaining at 100% through 264 VAC.
Working humidity
20–90% RH, non-condensing.
Storage
−40 to +85°C; 10–95% RH, non-condensing.
Temperature coefficient
±0.03%/°C over 0–45°C.
Vibration
10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes along each X, Y and Z axis.
Altitude derating
Above 2000 m, reduce permissible ambient temperature by 3.5°C per 1000 m for fanless operation.
Keep the adapter unobstructed and apply both input and temperature limits. The plotted operating-temperature range is not a full-power guarantee at every input voltage.
Dimensions and Connections
Enclosure dimensions, L × W × H
167 × 67 × 35 mm; drawing tolerance ±1 mm.
Attached DC cable
UL2464 16AWG × 2C; 1200 ±50 mm.
Default DC plug
P1M: Center positive; 5.5 mm OD × 2.5 mm ID × 11 mm length, tuning-fork style.
Grounding
Class I, with protective earth through the 3-pole AC inlet; standard DC −V is connected to AC FG.
AC cord
The catalogue specifies the AC inlet but does not state that a detachable mains cord is included. Select a suitable region-approved cord for this inlet and load.
Use the numbered connector drawing for orientation; do not infer pin numbers from a photograph. Match the mating connector, contacts and wire rating to the actual current. The alternative plug references below identify options, not extra items included with this adapter.
Alternative DC Plugs and Accessories
P1I
5.5 × 2.1 × 9.5 mm (OD × ID × length).
P1L
5.5 × 2.5 × 9.5 mm (OD × ID × length).
P1J
5.5 × 2.1 × 11.0 mm (OD × ID × length).
P1JR
5.5 × 2.1 × 11.0 mm; right-angle (OD × ID × length).
P1IR
5.5 × 2.1 × 9.5 mm; right-angle (OD × ID × length).
P1LR
5.5 × 2.5 × 9.5 mm; right-angle (OD × ID × length).
P1MR
5.5 × 2.5 × 11.0 mm; right-angle (OD × ID × length).
P2I
5.5 × 2.1 × 9.5 mm (OD × ID × length).
P2J
5.5 × 2.1 × 11.0 mm (OD × ID × length).
P2L
5.5 × 2.5 × 9.5 mm (OD × ID × length).
P2M
5.5 × 2.5 × 11.0 mm (OD × ID × length).
P2IR
5.5 × 2.1 × 9.5 mm; right-angle (OD × ID × length).
P2JR
5.5 × 2.1 × 11.0 mm; right-angle (OD × ID × length).
P2LR
5.5 × 2.5 × 9.5 mm; right-angle (OD × ID × length).
P2MR
5.5 × 2.5 × 11.0 mm; right-angle (OD × ID × length).
P2S (S761K)
5.53 × 2.03 × 12.06 mm (OD × ID × length).
P2K (761K)
5.53 × 2.54 × 12.06 mm (OD × ID × length).
P2C (S760K)
5.53 × 2.03 × 9.52 mm (OD × ID × length).
P2D (760K)
5.53 × 2.54 × 9.52 mm (OD × ID × length).
P4A
5.5 × 3.4 × 11.0 mm; center pin 1.0 mm (OD × ID × length).
P4B
6.5 × 4.4 × 11.0 mm; center pin 1.4 mm (OD × ID × length).
P4C
7.4 × 5.1 × 11.0 mm; center pin 0.6 mm (OD × ID × length).
R6B
Pins 1 and 3 +Vo; pin 2 −Vo. Male locking 3-pin DIN, KYCON KPPX-3P equivalent.
R7BF
Pins 1 and 4 +Vo; pins 2 and 3 −Vo. Female locking 4-pin DIN, KYCON KPJX-CM-4S equivalent.
R1B
Pins 1, 2 and 4 −Vo; pins 3 and 5 +Vo. Male 5-pin DIN.
MIC4
Pins 1 and 2 +Vo; pins 3 and 4 −Vo. NEUTRIK XLR NC4FX equivalent.
C6P
Pins 1–3 +Vo; pins 4–6 −Vo. MOLEX 39-01-2060 equivalent, 4.2 mm pitch.
C4P
Pins 1 and 2 +Vo; pins 3 and 4 −Vo. AMP 1-480702-0 equivalent, 6.35 mm pitch.
Stripped and tinned leads
Available by customer request: lead 1 +Vo, lead 2 −Vo; standard exposed lengths L = 25 mm and L1 = 5 mm. Wire colors are illustrative; follow the delivered product.
Alternative terminations can be specified as a customized cable subject to minimum order quantity. Only the options explicitly marked as quick adapters are available as separate accessories without minimum order quantity; the plug kit is sold separately.
The quick-adapter table marks P1J and P1JR available for 15–48 V outputs, with a 7.5 A maximum accessory current rating. Other listed terminations are not marked as available quick adapters.
The P1 family is tuning-fork style and the P2 family is barrel style; the locking P2S/P2K/P2C/P2D references identify SWITCHCRAFT originals or equivalents. P4 references are center-pin styles. Confirm the complete accessory configuration, polarity and allowable current before ordering.
Safety and EMC
Catalogue safety approvals
UL62368-1, CSA C22.2 No.62368-1, TUV BS EN/EN62368-1, BSMI CNS15598-1, CCC GB4943.1, PSE J62368-1, AS/NZS 62368.1, BIS IS13252, KC K60950-1 and EAC TP TC 004.
Energy-saving compliance
EISA 2007/DoE, NRCan, Korea K-MEPS, AU/NZ MEPS and EU ErP and CoC Version 5.
Withstand voltage
Input/output: 3 kVAC.
Insulation resistance
Input/output: 100 MΩ at 500 VDC, 25°C and 70% RH.
Conducted and radiated emissions
Class B under BS EN/EN55032 (CISPR32), FCC Part 15 / CISPR22 and CAN ICES-3(B)/NMB-3(B); EAC TP TC 020. Also listed: CNS15936, GB17625.1 and MSIP KN32.
Harmonic current / flicker
BS EN/EN61000-3-2 Class A and GB9254; BS EN/EN61000-3-3.
ESD immunity
BS EN/EN61000-4-2: 15 kV air and 8 kV contact, Level 4.
RF field / EFT immunity
BS EN/EN61000-4-3: 3 V/m, Level 2; -4-4: 1 kV, Level 2.
Surge immunity
BS EN/EN61000-4-5: 1 kV line-to-line and 2 kV line-to-FG, Level 3.
Conducted / magnetic immunity
BS EN/EN61000-4-6: 3 V, Level 2; -4-8: 3 A/m, Level 2.
Voltage dips and interruptions
BS EN/EN61000-4-11: >95% dip for 0.5 periods, 30% dip for 25 periods, and >95% interruption for 250 periods.
Generic immunity standard
BS EN/EN55035.
The adapter is considered an independent unit, but the complete equipment must still be checked for compliance with applicable EMC directives in its actual installation. Use approvals applicable to the exact model and market.
Weight and Reliability
Catalogue weight reference
575 g: catalogue packing reference per unit; not a measured net or shipping weight.
Packing
0.575 kg per unit; 20 pieces / 12.5 kg / 0.89 CUFT.
MTBF, minimum estimates
2250.5 thousand hours, Telcordia SR-332 (Bellcore); 368.5 thousand hours, MIL-HDBK-217F at 25°C.
Manufacturer warranty
3-year manufacturer warranty, subject to applicable terms.
Catalogue revision
Cover 2026-04-03; specifications and drawings 2025-03-28.
For connector orientation and complete dimensions, refer to PDF pages 71–75.
Read
more
less
