MEAN WELL GSM40A24-P1J is a GSM40A single-output medical AC/DC desktop power adapter rated at 24 VDC, 1.67 A and 40 W. Its Class I construction uses a three-pole IEC320-C14 AC inlet with protective earth. The standard P1J tuning-fork DC plug is center-positive, with a 5.5 mm outer diameter, 2.1 mm inner diameter and 11 mm nominal length. Apply the stated load and derating limits.
Product Datasheet
Download MEAN WELL GSM40A Datasheet (PDF)
The GSM40A section is on PDF pages 1, 2, 3, 4, 5. Refer to the complete mechanical drawings and notes when planning installation.
Model and Configuration
| Complete order number |
GSM40A24-P1J. |
| Product category |
Single-output medical AC/DC desktop power adapter. |
| Input class / inlet |
Class I; IEC320-C14; protective earth (FG). |
| Standard output termination |
P1J tuning fork; 5.5 mm OD × 2.1 mm ID × 11 mm nominal length; center positive. |
| Enclosure / indication |
Fully enclosed 94V-0 flame-retardant plastic case; power-on LED. |
| No-load power |
<0.15 W. |
| Energy efficiency |
Level VI for this voltage model; CoC Version 5. |
The series lists compliance with USA EISA 2007/DoE, Canada NRCan, Australia/New Zealand MEPS and EU ErP. Use the efficiency level specified for this particular voltage model.
Model-Specific DC Output
| Nominal DC voltage |
24 VDC. |
| Rated current |
1.67 A. |
| Current range |
0.1–1.67 A. |
| Rated output power, maximum |
40 W. |
| Ripple and noise, maximum |
150 mVp-p. |
| Voltage tolerance |
±2.5%. |
| Line regulation |
±1.0%. |
| Load regulation |
±2.5%. |
| Typical efficiency |
90%. |
Observe the current range and rated power together. The output-voltage set point is measured at the DC plug terminals at 50% load.
Input and Timing
| AC input |
80–264 VAC; 47–63 Hz. |
| AC input current, typical |
1 A at 115 VAC; 0.5 A at 230 VAC. |
| Cold-start inrush, typical |
30 A at 115 VAC; 60 A at 230 VAC. |
| Leakage current, maximum |
Earth leakage <100 µA and touch current <100 µA at 264 VAC. |
| Set-up / rise time, full load |
1000 / 30 ms at 230 VAC; 1500 / 30 ms at 115 VAC. |
| Hold-up time, typical at full load |
50 ms at 230 VAC; 24 ms at 115 VAC. |
Select a regional mains cord suitable for the inlet and load. A detachable AC cord is not established as included by this catalogue. Set-up time is measured at the first cold start; repeated ON/OFF operation may increase it.
Protection
| Short circuit / overload |
105–160% of rated output power; hiccup operation, automatically recovering after the fault is removed. |
| Overvoltage |
25.2–32.4 V; output shuts down; re-power to recover. |
Cooling and Operating Limits
| Working ambient |
−30 to +70°C, subject to the horizontal-installation derating curve. |
| Temperature derating |
100% load from −30 to 50°C; 80% at 60°C; 50% at 70°C. |
| Input derating, 60 Hz |
90% load at 80 VAC, rising to 100% at 90 VAC; 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 to 50°C. |
| Operating altitude |
Up to 3000 m; above 2000 m, reduce allowable ambient temperature by 3.5°C per 1000 m for this fanless adapter. |
| Vibration |
10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes along each X, Y and Z axis. |
Use the temperature and input-voltage limits together. The maximum ambient temperature is not an unconditional full-load rating.
Medical Isolation and Safety
| Means of patient protection |
Primary to secondary: 2 × MOPP. Primary to earth: 1 × MOPP. |
| Dielectric withstand |
Input/output: 4 kVAC. Input/FG: 2 kVAC. Output/FG: SHORT, as specified for the standard earth-connected output. |
| Insulation resistance |
Input/output and input/FG: 100 MΩ at 500 VDC, 25°C and 70% RH. |
| Catalogue safety standards |
IEC60601-1:2005+A1+A2; TUV BS EN/EN60601-1:2006+A1+A12+A2; ANSI/AAMI ES60601-1:2005+A2; CAN/CSA C22.2 No.60601-1:2014+A2; EAC TP TC 004. |
The medical ratings apply to the adapter. Final equipment must be assessed for its actual patient connections, applied-part classification, isolation and EMC requirements.
EMC
| Conducted / radiated emissions |
Class B: BS EN/EN55011 (CISPR11), FCC Part 15 / CISPR22. |
| Harmonics / flicker |
BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3. |
| Immunity standards |
BS EN/EN60601-1-2; BS EN/EN61204-3. |
| ESD |
EN61000-4-2: Level 4, 15 kV air and 8 kV contact. |
| RF susceptibility |
EN61000-4-3: Level 3, 10 V/m at 80 MHz–2.7 GHz; Table 9, 9–28 V/m at 385 MHz–5.78 GHz. |
| EFT / surge |
EN61000-4-4: Level 3, 2 kV. EN61000-4-5: Level 3, 1 kV line-to-line; 2 kV line-to-FG. |
| Conducted / magnetic immunity |
EN61000-4-6: Level 3, 10 V; EN61000-4-8: Level 4, 30 A/m. |
| Voltage dips / interruptions |
EN61000-4-11: 100% dip for 1 period, 30% dip for 25 periods, and 100% interruption for 250 periods. |
The adapter is an independent unit; compliance of the complete equipment with the applicable EMC requirements must be confirmed in its final installation.
Dimensions, Cable and Standard Plug
| Enclosure, L × W × H |
125 × 50 × 31.5 mm; mechanical drawing tolerance ±1 mm. |
| Attached DC cable |
UL1185 16 AWG, 1500 ±50 mm. |
| Plug projection |
11 ±0.5 mm; the drawing also marks a 70 ±10 mm cable-end section. |
| P1J polarity |
Inside contact positive (+); outside contact negative (−). |
| Output-to-earth connection |
−V is connected to AC FG in the standard configuration; a version without this connection is optional and must be specified when ordering. |
Use the dimensional drawing for placement and the supplied connector identification for mating. The plug dimensions and polarity must match the equipment input.
Optional DC Plug Types
| P1I |
straight tuning fork; OD × ID × L: 5.5 × 2.1 × 9.5 mm. Quick adapter available, 7.5 A maximum. |
| P1L |
straight tuning fork; OD × ID × L: 5.5 × 2.5 × 9.5 mm. Quick adapter available, 7.5 A maximum. |
| P1M |
straight tuning fork; OD × ID × L: 5.5 × 2.5 × 11 mm. Quick adapter available, 7.5 A maximum. |
| P1IR |
right-angled tuning fork; OD × ID × L: 5.5 × 2.1 × 9.5 mm. Quick adapter available, 7.5 A maximum. |
| P1JR |
right-angled tuning fork; OD × ID × L: 5.5 × 2.1 × 11 mm. Quick adapter available, 7.5 A maximum. |
| P1LR |
right-angled tuning fork; OD × ID × L: 5.5 × 2.5 × 9.5 mm. Quick adapter available, 7.5 A maximum. |
| P1MR |
right-angled tuning fork; OD × ID × L: 5.5 × 2.5 × 11 mm. Quick adapter available, 7.5 A maximum. |
| P2I |
straight barrel; OD × ID × L: 5.5 × 2.1 × 9.5 mm. Custom cable option; no quick adapter listed. |
| P2J |
straight barrel; OD × ID × L: 5.5 × 2.1 × 11 mm. Custom cable option; no quick adapter listed. |
| P2L |
straight barrel; OD × ID × L: 5.5 × 2.5 × 9.5 mm. Custom cable option; no quick adapter listed. |
| P2M |
straight barrel; OD × ID × L: 5.5 × 2.5 × 11 mm. Custom cable option; no quick adapter listed. |
| P2IR |
right-angled barrel; OD × ID × L: 5.5 × 2.1 × 9.5 mm. Custom cable option; no quick adapter listed. |
| P2JR |
right-angled barrel; OD × ID × L: 5.5 × 2.1 × 11 mm. Custom cable option; no quick adapter listed. |
| P2LR |
right-angled barrel; OD × ID × L: 5.5 × 2.5 × 9.5 mm. Custom cable option; no quick adapter listed. |
| P2MR |
right-angled barrel; OD × ID × L: 5.5 × 2.5 × 11 mm. Custom cable option; no quick adapter listed. |
| P2S |
locking; OD × ID × L: 5.53 × 2.03 × 12.06 mm. SWITCHCRAFT S761K original or equivalent. Custom cable option; no quick adapter listed. |
| P2K |
locking; OD × ID × L: 5.53 × 2.54 × 12.06 mm. SWITCHCRAFT 761K original or equivalent. Custom cable option; no quick adapter listed. |
| P2C |
locking; OD × ID × L: 5.53 × 2.03 × 9.52 mm. SWITCHCRAFT S760K original or equivalent. Custom cable option; no quick adapter listed. |
| P2D |
locking; OD × ID × L: 5.53 × 2.54 × 9.52 mm. SWITCHCRAFT 760K original or equivalent. Custom cable option; no quick adapter listed. |
| P3A |
minimum-pin; OD × ID × L: 2.35 × 0.7 × 11 mm. EIAJ equivalent. Quick adapter available, 5 A maximum. |
| P3B |
minimum-pin; OD × ID × L: 4.0 × 1.7 × 11 mm. EIAJ equivalent. Quick adapter available, 5 A maximum. |
| P3C |
minimum-pin; OD × ID × L: 4.75 × 1.7 × 11 mm. EIAJ equivalent. Quick adapter available, 5 A maximum. |
| P4A |
center-pin; OD × ID × L: 5.5 × 3.4 × 11 mm. Center pin 1.0 mm; EIAJ equivalent. Quick adapter available, 7.5 A maximum. |
| P4B |
center-pin; OD × ID × L: 6.5 × 4.4 × 11 mm. Center pin 1.4 mm; EIAJ equivalent. Quick adapter available, 7.5 A maximum. |
| P4C |
center-pin; OD × ID × L: 7.4 × 5.1 × 11 mm. Center pin 0.6 mm; EIAJ equivalent. Quick adapter available, 7.5 A maximum. |
The supplied standard model uses P1J. A custom cable with a different plug is subject to the applicable minimum order quantity. Listed quick adapters are sold separately without a minimum order quantity.
Select the exact dimensions, polarity and current rating for the load. The accessory current rating does not increase the adapter rating; a 5 A quick adapter cannot carry a load above 5 A.
Optional Multi-Pin and Lead Terminations
| R6B |
Locking three-pin male mini-DIN; KYCON KPPX-3P equivalent; pin 1 +Vo, pin 2 −Vo, pin 3 +Vo. Quick adapter available, 7.5 A maximum. |
| R7B |
Locking four-pin male mini-DIN; KYCON KPPX-4P equivalent; pin 1 +Vo, pin 2 −Vo, pin 3 −Vo, pin 4 +Vo. Quick adapter available, 7.5 A maximum. |
| R7BF |
Locking four-pin female mini-DIN; KYCON KPJX-CM-4S equivalent; pin 1 +Vo, pin 2 −Vo, pin 3 −Vo, pin 4 +Vo. No quick adapter listed. |
| R1B |
Five-pin male DIN; pin 1 −Vo, pin 2 −Vo, pin 3 +Vo, pin 4 −Vo, pin 5 +Vo. Quick adapter available, 7.5 A maximum. |
| Stripped and tinned option |
By customer request: conductor 1 = +Vo; conductor 2 = −Vo. Standard L = 25 mm and L1 = 5 mm; other lengths by request. |
| Lead colors |
The red/black illustration is for reference only; follow the actual supplied product. |
Use the numbered connector-face drawing to establish orientation. These are optional connection types, not additional connectors included with the P1J adapter.
Weight, Reliability and Measurement Notes
| Catalogue unit weight |
250 g, converted from the per-unit PACKING entry; not a measured shipment weight. |
| Carton packing |
40 pieces / 12 kg / 1.04 CUFT. |
| Lifetime reference |
Catalogue feature: >90,000 hours; this is distinct from MTBF. |
| MTBF, minimum estimate |
3613.2 thousand hours, Telcordia SR-332 (Bellcore); 740.7 thousand hours, MIL-HDBK-217F at 25°C. |
| Manufacturer warranty |
3 years, subject to applicable terms. |
| Catalogue revision |
2026-05-09; physical PDF pages 1–5. |
Unless specified otherwise, ratings are measured at 230 VAC, rated load, 25°C and 70% RH. Ripple/noise uses 20 MHz bandwidth and a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors.
Voltage tolerance includes set-up tolerance, line regulation and load regulation. Line regulation is measured from low to high input at rated load.