MEAN WELL GSM120B12-R7B is a 12 V, 8.5 A desktop medical AC/DC adapter with a catalogue-rated maximum output of 102 W. Its Class II IEC320-C8 inlet and R7B output connector define the connection format. Apply the stated input, ambient-temperature and connector-current limits when selecting the load.
Product Datasheet
Download MEAN WELL GSM120B Datasheet (PDF)
The GSM120B section is on PDF pages 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output
| Complete model |
GSM120B12-R7B. |
| Series and format |
GSM120B single-output desktop medical AC/DC power adapter. |
| Model code |
GSM identifies the adapter series; 120 the power family; B the Class II C8 inlet; 12 the nominal output voltage; R7B the standard DC connector. |
| DC output voltage |
12 VDC. |
| Rated output current |
8.5 A. |
| Output current range |
0–8.5 A. |
| Catalogue-rated output power, maximum |
102 W; subject to input and ambient derating. |
| Ripple and noise, maximum |
100 mVp-p. |
| Voltage tolerance |
±5.0%. |
| Line regulation |
±1.0%. |
| Load regulation |
±5.0%. |
| Efficiency, typical |
88%. |
Select the load to stay within the rated current, output voltage and maximum output-power limits simultaneously.
Input and Energy
| Input voltage |
80–264 VAC or 113–370 VDC. |
| Input frequency |
47–63 Hz. |
| AC inlet and class |
IEC320-C8; Class II, two-pole inlet without FG. |
| Power factor, typical |
>0.93 at 230 VAC; >0.97 at 115 VAC, at full load. |
| Input current, typical |
1.4 A at 115 VAC; 0.7 A at 230 VAC. |
| Cold-start inrush, typical |
35 A at 115 VAC; 70 A at 230 VAC. |
| Set-up and rise times |
At full load: 1500 / 30 ms at 230 VAC; 2000 / 30 ms at 115 VAC. |
| Hold-up time, typical |
At full load: 40 ms at 230 VAC; 24 ms at 115 VAC. |
| Touch leakage current |
<100 µA at 264 VAC. |
| No-load consumption |
<0.15 W. |
| Energy efficiency |
Level VI and CoC Version 5; EISA2007/DoE, Canada NRCan, Australia/New Zealand MEPS and EU ErP are listed for the series. |
Choose an AC mains lead appropriate to the IEC320-C8 inlet and local supply. Confirm whether the mains lead is included with the order.
Protection
| Short circuit / overload |
105–160% of rated output power; hiccup mode, automatically recovering after the fault is removed. |
| Overvoltage |
105–135% of rated output voltage; output shutdown, with re-power required for recovery. |
| Overtemperature |
Output shutdown; re-power to recover. |
Derating and Environment
| Working ambient |
−30 to +70°C, subject to derating. |
| Horizontal temperature curve |
100% load through 40°C; 80% at 50°C; 50% at 70°C. Use the plotted curve between these points. |
| Input-voltage curve, 60 Hz |
80% load at 80 VAC, rising to 100% at 100 VAC; 100% from 100 to 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 0–40°C. |
| Operating altitude |
Up to 3000 m. Above 2000 m, reduce allowable ambient temperature by 3.5°C per additional 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. |
Apply input-voltage, ambient-temperature and altitude derating together. Maintain free airflow around the enclosure.
Mechanical Details and Standard Connection
| Dimensions, L × W × H |
167 × 67 × 35 mm; mechanical drawing tolerance ±1 mm. |
| Enclosure and indicator |
Enclosed 94V-0 flame-retardant plastic case; power-on LED indicator. |
| Output cable |
UL2464, 16 AWG × 4 conductors; length 1000 ±50 mm. |
| Standard output connector |
R7B four-pin male locking power DIN; KYCON KPPX-4P equivalent. Pins 1 and 4: +Vo; pins 2 and 3: −Vo. Follow the drawing view when identifying contacts. |
| Grounding and polarity |
Class II input has no FG connection. Use both positive and both negative contacts as specified in the connector drawing. |
| Catalogue single-unit weight |
600 g, from the explicit 0.6 kg single-unit PACKING entry; a catalogue reference, not a measured shipping weight. |
| Packing |
20 pieces / 13 kg / 0.89 CUFT. |
Allow space for the inlet, cable, ferrite and connector. Use the complete mechanical drawing for cable routing and connector orientation.
Optional DC Plugs and Quick Adapters
| Ordering and inclusion |
Custom DC-plug changes are subject to MOQ. Quick adapters are separately sold without MOQ; they are not included with the standard -R7B unit. |
| P1J and P1M |
P1J / P1M quick adapters are listed only for 15–48 V models and are rated 7.5 A maximum. This 12 V, 8.5 A model is excluded from that listed quick-adapter range, and a 7.5 A adapter cannot carry its full rated output. Retain the standard R7B connection or obtain a specifically approved custom termination. P1J is 5.5 mm OD / 2.1 mm ID / 11 mm long; P1M is 5.5 / 2.5 / 11 mm. Both are straight tuning-fork types. |
| R7BF |
Four-pin female locking DIN, KYCON KPJX-CM-4S equivalent: pins 1 and 4 +Vo; pins 2 and 3 −Vo. Custom option, without a listed quick adapter. |
| R1B |
Five-pin male DIN: pins 1, 2 and 4 −Vo; pins 3 and 5 +Vo. Custom option, without a listed quick adapter. |
| MIC4 |
NEUTRIK XLR NC4FX equivalent: pins 1 and 2 +Vo; pins 3 and 4 −Vo. Custom option, without a listed quick adapter. |
| C6P |
MOLEX 39-01-2060 (4.2 mm) equivalent: pins 1–3 +Vo; pins 4–6 −Vo. FG is not connected to the output connector. Custom option, without a listed quick adapter. |
| C4P |
AMP 1-480702-0 (6.35 mm) equivalent: pins 1 and 2 +Vo; pins 3 and 4 −Vo. FG is not connected to the output connector. Custom option, without a listed quick adapter. |
| Stripped and tinned leads |
By customer request. Standard L = 25 mm and L1 = 5 mm; other lengths by request. Reference colours: red/blue +Vo and black/white −Vo; verify the actual supplied lead identification. |
Match the connector, voltage, current and polarity to the equipment. Use the drawing view for pin numbering; custom terminations are alternatives to the standard plug.
Medical Safety and Isolation
| Listed safety standards |
IEC60601-1:2005+A1+A2 and IEC60601-1-11:2015+A1; TUV BS EN/EN60601-1:2006+A1+A12+A2 and BS EN/EN60601-1-11:2015+A1; ANSI/AAMI ES60601-1:2005+A2 and ANSI/AAMI HA60601-1-11+A1; CAN/CSA C22.2 No.60601-1:2014+A2 and CSA C22.2 No.60601-1-11:2015+A1; EAC TP TC004. |
| Isolation |
Primary to secondary: 2 MOPP. |
| Input-to-output withstand |
4 kVAC. |
| Input-to-output insulation |
100 MΩ at 500 VDC, 25°C and 70% RH. |
| BF application |
The series is marked BF-rated and lists medical home-healthcare standards; assess the completed medical equipment and applied-part design for the intended use. |
The adapter is a power component. Its listed approvals do not replace final-system safety, EMC and applied-part assessment.
EMC
| Conducted and radiated emissions |
BS EN/EN55011 (CISPR11), FCC Part 15 / CISPR22: Class B. |
| Harmonic current and flicker |
BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3. |
| Immunity framework |
BS EN/EN60601-1-2 and BS EN/EN61204-3. |
| ESD |
BS EN/EN61000-4-2: Level 4, 15 kV air and 8 kV contact. |
| Radiated RF |
BS EN/EN61000-4-3: Level 3, 10 V/m from 80 MHz to 2.7 GHz; Table 9, 9–28 V/m from 385 MHz to 5.78 GHz. |
| EFT / burst |
BS EN/EN61000-4-4: Level 3, 2 kV. |
| Surge |
BS EN/EN61000-4-5: Level 3, 1 kV line-to-line. |
| Conducted RF |
BS EN/EN61000-4-6: Level 3, 10 V. |
| Magnetic field |
BS EN/EN61000-4-8: Level 4, 30 A/m. |
| Dips and interruptions |
BS EN/EN61000-4-11: 100% dip for 1 period; 30% dip for 25 periods; 100% interruption for 250 periods. |
Reliability, Applications and Test Conditions
| MTBF, minimum |
2546.9 thousand hours, Telcordia SR-332 (Bellcore); 372.0 thousand hours, MIL-HDBK-217F at 25°C. |
| Series lifetime statement |
>105 thousand hours is listed for the series; select operating conditions appropriate to the required service life. |
| Manufacturer warranty |
The datasheet lists a 3-year manufacturer warranty, subject to the manufacturer’s terms. |
Applications listed for the series include mobile clinical workstations, oral irrigators, portable haemodialysis equipment, breathing equipment and medical computer monitors. Choose the complete configuration for the equipment’s load, insulation and connection requirements.
Unless otherwise stated, specifications use 230 VAC input, rated load, 25°C and 70% RH. Output voltage is set at the plug terminal at 50% load.
Ripple and noise use 20 MHz bandwidth, a 12-inch twisted pair and 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 line at rated load.
Set-up time is measured at the first cold start. Repeated power cycling may increase start-up time. Follow the manufacturer’s installation instructions and the complete mechanical and electrical drawings.
