MEAN WELL GST18B48-P1J is a single-output desktop AC/DC power adapter rated at 48 V, 0.375 A and 18 W maximum. It uses two-pole IEC 320-C8 AC inlet and a center-positive P1J DC connector. Class II, double-insulated, without FG. Apply the specified temperature and low-input-voltage derating.
Product Datasheet
Download MEAN WELL GST18B Datasheet (PDF)
The GST18B section is on PDF pages 6, 7, 8, 9, 10. Refer to the complete mechanical drawings and notes when planning installation.
Model-Specific DC Output
Complete order number
GST18B48-P1J.
Safety model number
GST18B48.
DC output voltage
48 V.
Rated output current
0.375 A.
Output current range
0–0.375 A.
Maximum rated output power
18 W, subject to input-voltage and ambient-temperature derating.
Maximum ripple and noise
150 mVp-p.
Voltage tolerance
±2.0%.
Line regulation
±1.0%.
Load regulation
±2.0%.
Typical efficiency
89%.
AC Input, Class and Timing
AC input range
85–264 VAC, 47–63 Hz.
AC connection
Two-pole IEC 320-C8 AC inlet.
Electrical class
Class II, double-insulated, without FG.
AC input current
0.5 A at 115 VAC; 0.3 A at 230 VAC.
Maximum cold-start inrush
35 A at 115 VAC; 65 A at 230 VAC.
Maximum leakage current
0.25 mA at 240 VAC.
Set-up / rise / hold-up at 230 VAC
1000 / 30 / 50 ms at full load.
Set-up / rise / hold-up at 115 VAC
1500 / 30 / 15 ms at full load.
No-load power
Less than 0.075 W.
Power indication
Power-on LED.
Protection and Load Derating
Short circuit and overload
Overload threshold: 110–150% of rated output power. Hiccup mode with automatic recovery after the fault condition is removed.
Overvoltage
110–140% of rated output voltage; zener-diode clamping with output shorting.
Thermal load curve
100% load from −30°C through 50°C; derate to 50% at 70°C.
Input-voltage load curve
At 60 Hz: 85% load at 85 VAC, increasing to 100% at 100 VAC; 100% through 264 VAC.
Apply the temperature and input-voltage limits together. Operation at the upper ambient limit requires reduced load.
Enclosure, Dimensions and Output Cable
Construction
Fully enclosed 94V-0 flame-retardant plastic desktop adapter.
Body dimensions, L × W × H
79 × 54 × 33 mm.
Mechanical drawing tolerance
±1 mm, except dimensions with their own tolerance.
Case reference
GSM36B.
DC output cable
UL1185, 18 AWG, 1800 ±50 mm.
Standard P1J connector
Tuning-fork type; 5.5 mm outside diameter × 2.1 mm inside diameter × 11 ±0.5 mm insertion length.
P1J polarity
C+: center / inside positive (+Vo), outside negative (−Vo).
The output-side cable filter is shown with a 70 ±10 mm reference distance to the connector.
Optional DC Plug and Adapter Selection
Selection and supply
Alternative plug types are available on a customized cable, with MOQ applicable. Listed quick adapters are sold separately without MOQ. These options are not included with the standard P1J configuration.
Tuning-fork choices
P1I: 5.5 × 2.1 × 9.5; P1L: 5.5 × 2.5 × 9.5; P1M: 5.5 × 2.5 × 11; P1IR: 5.5 × 2.1 × 9.5; P1JR: 5.5 × 2.1 × 11; P1LR: 5.5 × 2.5 × 9.5; P1MR: 5.5 × 2.5 × 11. Dimensions are OD × ID × insertion length, in mm. P1IR, P1JR, P1LR, P1MR are right-angled; the other entries are straight. Quick-adapter rating: 7.5 A maximum.
Barrel choices
P2I: 5.5 × 2.1 × 9.5; P2J: 5.5 × 2.1 × 11; P2L: 5.5 × 2.5 × 9.5; P2M: 5.5 × 2.5 × 11; P2IR: 5.5 × 2.1 × 9.5; P2JR: 5.5 × 2.1 × 11; P2LR: 5.5 × 2.5 × 9.5; P2MR: 5.5 × 2.5 × 11. Dimensions are OD × ID × insertion length, in mm. P2IR, P2JR, P2LR, P2MR are right-angled; the other entries are straight. Customized cable only; no quick adapter is listed.
Locking choices
P2S (S761K): 5.53 × 2.03 × 12.06; P2K (761K): 5.53 × 2.54 × 12.06; P2C (S760K): 5.53 × 2.03 × 9.52; P2D (760K): 5.53 × 2.54 × 9.52. Dimensions are OD × ID × insertion length, in mm. SWITCHCRAFT original or equivalent. Customized cable only; no quick adapter is listed.
Mini-pin choices
P3A: 2.35 × 0.7 × 11; P3B: 4 × 1.7 × 11; P3C: 4.75 × 1.7 × 11. Dimensions are OD × ID × insertion length, in mm. EIAJ equivalent. Quick-adapter rating: 5 A maximum.
Center-pin choices
P4A: 5.5 × 3.4 × 11 × 1.0; P4B: 6.5 × 4.4 × 11 × 1.4; P4C: 7.4 × 5.1 × 11 × 0.6. Dimensions are OD × ID × insertion length × center-pin diameter, in mm. EIAJ equivalent; quick adapters rated 7.5 A maximum.
R6B
Locking male mini-DIN 3-pin; KYCON KPPX-3P equivalent. pin 1 +Vo; pin 2 −Vo; pin 3 +Vo. Quick adapter rated 7.5 A maximum.
R7B
Locking male mini-DIN 4-pin; KYCON KPPX-4P equivalent. pin 1 +Vo; pin 2 −Vo; pin 3 −Vo; pin 4 +Vo. Quick adapter rated 7.5 A maximum.
R7BF
Locking female mini-DIN 4-pin; KYCON KPJX-CM-4S equivalent. pin 1 +Vo; pin 2 −Vo; pin 3 −Vo; pin 4 +Vo. Customized cable only; no quick adapter is listed.
R1B
Male DIN 5-pin. pin 1 −Vo; pin 2 −Vo; pin 3 +Vo; pin 4 −Vo; pin 5 +Vo. Quick adapter rated 7.5 A maximum.
Stripped and tinned leads
Customized leads: pin 1 +Vo, pin 2 −Vo. Standard reference lengths L = 25 mm and L1 = 5 mm; other lengths by request. Red and black colours are references only; use actual product identification. No quick adapter is listed.
Match connector dimensions, polarity and pin assignment to the load. The plug type references describe cable or adapter selection; they do not increase this power supply’s output-current or power rating. The applicable limit is the lower of the supply and accessory ratings.
Environment and Reliability
Operating conditions
−30 to +70°C with load derating; 20–90% RH, non-condensing.
Storage conditions
−40 to +85°C; 10–95% RH, non-condensing.
Temperature coefficient
±0.03%/°C over 0–50°C.
Vibration
10–500 Hz, 2 G; 10-minute cycle, 60 minutes along each X, Y and Z axis.
MTBF, minimum estimates
3879.7 thousand hours under Telcordia SR-332 (Bellcore); 668.4 thousand hours under MIL-HDBK-217F at 25°C.
Warranty
Three-year manufacturer warranty, subject to applicable terms.
Safety and Efficiency
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/NZS62368.1; BIS IS13252; KC K60950-1; EAC TP TC004.
Limited power source
LPS compliant.
Energy compliance
Energy efficiency Level VI; EISA 2007 / DoE, Canada NRCan, Korea K-MEPS, AU/NZ MEPS, EU ErP and CoC Version 5.
Withstand voltage
Input–output: 4242 VDC.
Insulation resistance
Input–output: 100 MΩ at 500 VDC, 25°C and 70% RH.
Electromagnetic Compatibility
Conducted and radiated emissions
BS EN/EN55032 (CISPR32), FCC Part 15 / CISPR22, CAN ICES-3(B) / NMB-3(B), CNS15936, GB17625.1, EAC TP TC020 and MSIP KN32: Class B conducted and radiated emissions.
Harmonic current
BS EN/EN61000-3-2 and GB9254: Class A.
Voltage flicker
BS EN/EN61000-3-3.
Immunity standard
BS EN/EN55035.
Electrostatic discharge
IEC/EN61000-4-2: Level 3, 8 kV air; Level 2, 4 kV contact.
Radio-frequency field
IEC/EN61000-4-3: Level 2, 3 V/m.
Electrical fast transient
IEC/EN61000-4-4: Level 2, 1 kV.
Surge
IEC/EN61000-4-5: Level 3, 1 kV line–line.
Conducted RF / magnetic field
IEC/EN61000-4-6: Level 2, 3 V; IEC/EN61000-4-8: Level 2, 3 A/m.
Voltage dips and interruptions
IEC/EN61000-4-11: >95% dip for 0.5 period; 30% dip for 25 periods; >95% interruption for 250 periods.
The adapter is an independent power unit. The final equipment must be checked for EMC compliance with its actual wiring and installation.
Measurement Conditions and Catalogue
Default test conditions
230 VAC input, rated load, 25°C ambient and 70% RH, unless otherwise specified.
Output-voltage set point
Measured at the DC plug terminal at 50% load.
Ripple measurement
20 MHz bandwidth; 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Regulation conditions
Voltage tolerance includes set-up tolerance, line regulation and load regulation. Line regulation: low-to-high line at rated load. Load regulation: 10–100% rated load.
Single-unit reference weight
191.5 g, explicitly listed in PACKING.
Carton packing
60 pieces / 12.5 kg / 1.15 CUFT.
Catalogue revision
GST18B-SPEC, 2026-04-03; combined PDF pages 6–10.
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