VGSM-280B-12-M1

AC-DC,12 ,SIN OUT,MET CASE,MOL CONN,MED

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Manufacturer: CUI
Product type: AC / DC Enclosed Power Supplies
SVHC: No SVHC (04-Feb-2026)

Delivery and price
Units per pack	40
Price	128.74 €
Current stock	10+
Lead time	30 days

Datasheet

**date** 11/18/2024 **page** 1 of 5 

## **SERIES:** VGSM-280B **DESCRIPTION:** AC-DC POWER SUPPLY **│** 

## **FEATURES** 

- 200 W with natural convection, 280 W with forced air cooling 

- certified to EN/UL 60601-1, 2xMOPP 

- designed to meet EN 60601-1-2 

- designed to meet EN 55011/EN 55032 

- universal input range 90 ~ 264 Vac 

- 5 V standby and 12 V fan outputs 

- output short circuit, over current, over voltage, and over temperature protection 

- operating altitude 3,000 m 

- operating temperature range -20 ~ 70 °C with derating 

- remote ON/OFF control 

|HowsWAL<br>C€||||||
|---|---|---|---|---|---|
|**MODEL**<br>HowsWAL<br>C €|**output**<br>**voltage**|**output**<br>**current1**|**output**<br>**power1,2**|**ripple**<br>**and noise3**|**efficiency4**|
|||**max**|**max**|**max**|**typ**|
||(Vdc)|(A)|(W)|(mVp-p)|**(%)**|
|VGSM-280B-12|12|23.33|280|150|91|
|VGSM-280B-24|24|11.66|280|240|91|
|VGSM-280B-28|28|10.0|280|280|91|
|VGSM-280B-36|36|7.77|280|300|91|
|VGSM-280B-48|48|5.83|280|300|91|
|VGSM-280B-54|54|5.18|280|400|91|



- Notes: 1. Maximum output power of 280 W with 18 CFM forced air cooling, and 200 W with natural convection cooling. 

2. With forced air (18 CFM). 

3. Ripple is measured with 20 MHz bandwidth and 47 µF tantalum capacitor in parallel with a 0.1 µF capacitor at output connector. 

4. At 230 Vac, full load. 

5. All specifications are measured at Ta=25°C, nominal input voltage, and rated output load unless otherwise specified. 

## **PART NUMBER KEY** 

## **- - - VGSM 280B XX XX** 

Base Number ~~_——a~~~ Output Voltage 

Output Connections: “blank” = C-connector M1 = molex connector M2 = terminal block connector 

**cui** .com 

**CUI Inc │ SERIES:** VGSM-280B **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 11/18/2024 **│ page** 2 of 5 

|**INPUT**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|voltage||90|115~230|264|Vac|
|frequency||47|50~60|63|Hz|
|current|at 115 Vac, 50 Hz|||3.5|A|
|inrush current|at 230 Vac, cold start|||60|A|
|power factor|at full load||0.9|||
|touch  current|at 264 Vac|||94|µA|
|no load power consumption||||0.5|W|
|**OUTPUT**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|load regulation|12 & 24 Vdc output model<br>all other outputs||±3<br>±2||%<br>%|
|hold-up time|||10||ms|
|transient response|10% to full load deviation recovery time|< 20mS 10% max||||
|temperature coefcient|||±0.01||%/°C|
|fan output|12 Vdc / 0.3 A|||||
|switching frequency||80||100|kHz|
|remote on/of6|logic high (3.5~5.15 Vdc)<br>logic low (<1 Vdc)|||||



Notes: 6. Position in CN4 pin 3 & pin 4 (pin 3 is INHIBIT, pin 4 is GND). 

## **PROTECTIONS** 

|**PROTECTIONS**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
||12 Vdc output model|13.0||16.8|Vdc|
||24 Vdc output model|25.2||31.2|Vdc|
|over voltage protection|28 Vdc output model<br>36 Vdc output model|29.4<br>37.5||36.4<br>48.0|Vdc<br>Vdc|
||48 Vdc output model|50.4||62.0|Vdc|
||54 Vdc output model|56.0||68.0|Vdc|
|over current protection|auto recovery|105||150|%|
|short circuit protection|auto recovery|||||
|over temperature protection|recovery requires ac power cycle or INHIBIT pin reset|||||



## **SAFETY & COMPLIANCE** 

|**parameter**|**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**|
|---|---|
|isolation voltage|input to output , 2 MOPP<br>4,000<br>5,656<br>Vac<br>Vdc|
||input to earth ground, 1 MOPP<br>1,500<br>2,121<br>Vac<br>Vdc|
||output to earth ground, 1 MOPP<br>1,500<br>2,121<br>Vac<br>Vdc|
|safety approvals7|certifed to 60601-1: UL, EN|
|EMI/EMC|IEC 60601-1-2 Ed4:2014, EN 60601-1-2 Ed4:2015, EN 55024, EN 55011 Class B<br>EN 55032 Class B, FCC Part 15 Class B, FCC Part 18 Class B|
|MTBF|as per Telcordia SR-332 (Bellcore) at 25°C<br>250,000<br>hours|
|RoHS|yes|
|Notes:<br>7. 2xMOPP||



**cui** .com 

**CUI Inc │ SERIES:** VGSM-280B **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 11/18/2024 **│ page** 3 of 5 

## **ENVIRONMENTAL** 

|**ENVIRONMENTAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating temperature|see derating curves|-20||70|°C|
|storage temperature||-20||85|°C|
|operating humidity|non-condensing|0||90|%|
|storage humidity|non-condensing|0||90|%|
|operating altitude||||3,000|m|



## **DERATING CURVES** 

**cui** .com 

**CUI Inc │ SERIES:** VGSM-280B **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 11/18/2024 **│ page** 4 of 5 

## **MECHANICAL** 

|**MECHANICAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|dimensions|127.00 x 83.20 x 39.5||||mm|
|weight|||500||g|
|cooling|forced air cooling|||||



## **MECHANICAL DRAWING** 

units: mm 

|units: mm|units: mm|
|---|---|
|CN1: Input Connector<br>JST B2P3-VH pitch: 3.96 mm or equivalent,<br>mates with JST VAR-2 or equivalent||
|PIN|Function|
|1|AC (L)|
|2|AC (N)|



|CN2:  FAN Output Connector<br>JST B2B-XH-A pitch: 2.5 mm or equivalent,<br>mates with JST XHP-2 or equivalent|CN2:  FAN Output Connector<br>JST B2B-XH-A pitch: 2.5 mm or equivalent,<br>mates with JST XHP-2 or equivalent|
|---|---|
|PIN|Function|
|1|GND FAN-|
|2|+12V FAN+|



|CN4: Remote control and Standby supply<br>JST B2B-XH-A pitch: 2.5 mm or equivalent,<br>mates with JST XHP-4 or equivalent|CN4: Remote control and Standby supply<br>JST B2B-XH-A pitch: 2.5 mm or equivalent,<br>mates with JST XHP-4 or equivalent|
|---|---|
|PIN|Function|
|1|GND|
|2|+5 VSB|
|3|INHIBIT (Remote control)|
|4|INHIBIT (Remote control)<br>GND|



INHIBIT = Logic level HIGH (5V) or Floating: Enable, Logic level LOW: Disable 

|**Molex Connector**|**Molex Connector**|
|---|---|
|12 pin min fit pitch: 4.2 mm<br>Molex PN 39-28-1123<br>or equivalent||
|PIN|Function|
|1|+Vout|
|2|+Vout|
|3|+Vout|
|4<br>5|GND<br>GND|
|6|GND|
|7|+Vout|
|8|+Vout|
|9|+Vout|
|10|GND|
|11|GND|
|12|GND|



**C-Connector** JST B8P-VH-B pitch: 3.96 mm or equivalent, mates with JST FHR-8N or equivalent 

|45 25><br>as|25> CD &<br>Cao<br>GpCaa«apaD|fgtt<br>("|||Standby|JST FHR-8N or equivalent|JST FHR-8N or equivalent||
|---|---|---|---|---|---|---|
|as|Gp Ca a «ap aD|("||<br>||Standby<br>LED|PIN|Function||
|1<br>GND<br>~~5~~<br>~~3~~<br>~~a~~|||||||
|2<br>~~F~~<br>119,40<br>4<br>|®<br>o|||||GND||
|||||3|GND||
|ee|ee|ee|||||
|||||4|GND||
|||9.90-4||5|+Vout||
|||||6|+Vout||
||,<br>|<br>||||7<br>8|+Vout<br>+Vout||



## **Terminal Block Connector** 

## **CN3: Main Output Connector** 

|**Terminal Block Connector**<br>4-Pole Terminal block pitch:<br>8.25 mm, rate 20A/300V<br>or equivalent|**Terminal Block Connector**<br>4-Pole Terminal block pitch:<br>8.25 mm, rate 20A/300V<br>or equivalent|
|---|---|
|PIN|Function|
|1|GND|
|2|GND|
|3|+Vout|
|4|+Vout|



**cui** .com 

**CUI Inc │ SERIES:** VGSM-280B **│ DESCRIPTION:** AC-DC POWER SUPPLY 

**date** 11/18/2024 **│ page** 5 of 5 

## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|10/20/2024|
|1.01|features updated|11/18/2024|



The revision history provided is for informational purposes only and is believed to be accurate. 

**==> picture [115 x 37] intentionally omitted <==**

**Headquarters** 15575 SW Sequoia Pkwy #100 Portland, OR 97224 **800.275.4899** 

Fax 503.612.2383 **cui** .com techsupport@cui.com 

CUI offers a two (2) year limited warranty.  Complete warranty information is listed on our website. 

CUI reserves the right to make changes to the product at any time without notice.  Information provided by CUI is believed to be accurate and reliable.  However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. 

CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability.  A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

Updated at June 10, 2026

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