3U 6 HP 120W 100 TO 240V AC Power Supply

Manufacturer: duagon MEN

MEN's PU21 is a plug-in power supply unit for 19" systems (like VMEbus and CompactPCI® Serial). It is specially designed for computer systems in public transport vehicles and for harsh environments, like railway applications, making it suitable for both onboard and wayside use.

The PU21 has a nominal input power range of 100 to 240 VAC with a max. input voltage range of 90 to 264 VAC.

The output power is 120 W, with a dynamic load sharing of between 5 V and 12 V. The output power at 3.3 V is 30 W, which is shared with the 5 V load. Switch-on behaviour is independent of the load.

The PU21 also has a standby voltage of 5 V with 5W to supply the independent shelf controller and to support wake-on-LAN functionality.

The PSU provides three ports on the secondary side which indicate the event of an input power failure, output voltage failure or a fail-over temperature.

The PSU is coated conformally, and all components are secured against vibration. When more power supplies run in parallel, the performance loss is shared evenly and, in case of a fault in one of the power supplies, the output power is removed completely so as to avoid any negative effects. The double power monitoring ensures that the output voltage is within the valid range. In case of error, the voltage is powered-down as prepared by the SIL applications. The thermal stress is extremely low due to integrated heat sinks, and diversion of dissipated heat over the mounting surface.

The PU21 is fully compliant with EN 50155, meeting all shock, vibration, EMC and isolation requirements. Operating under temperatures ranging from -40 to 70°C with increments to 85°C for 10 minutes (class TX), with hold up time of 20 ms (at an input of 100 V).


InputNominal input voltage range: 100..240 VAC
Maximum input voltage range: 90..264 VAC
Maximum input power: 135 W
Standby voltage: 5 V
Power-on/-off threshold
Inrush current limiting
Type H15, DIN 41612 plug connector (rear)
Output(s)Output voltages: 12 VDC, 5 VDC and 3.3 VDC
Standby output voltage: 5 V with a 5 W load
Accuracy: Max. ±1% of the nominal value
Holdup time: 20 ms (at an input of 100 V)
Dynamic load distribution
• 120 W for complete temperature range without forced airflow
• Load sharing between 12 VDC output and 5 VDC output, including 3.3 VDC
IsolationIsolation (according to EN 50155)
• Input/output: 3100 VAC
• Input/shield: 3100 VAC
• Output/shield: 1000 VAC
According to EN 60950-1
OtherStatus Indicator
• Input power failure
• Output voltage failure
• Fail-over temperature

Parallel connection, up to six power supply units can be used in parallel
• Extends availability (backup protection against faults)
• Extends power
• Increases performance
• Ensures redundancy

• Overload and short circuit protection
• Standby voltage at power down, always available
• Reverse polarity protection for input voltage and short circuit
• Output voltage and temperature supervision
• Over-temperature and overvoltage shutdown
• Status LED on the front panel


ElectricalSee above
MechanicalDimensions: 3U, 6HP
Integrated heat sink
Conformal CoatingAs standard
TemperatureTemperature range (operation): -40..+70°C (85°C/10 mins), no derating
Temperature range (storage): -50..+85°C
Temperature: 70°C, with up to 85°C for 10 minutes according to class Tx (EN 50155)
VibrationVibration (function): 2.02 m/s², 5 Hz - 200 Hz (EN 61373)
Vibration (lifetime): 11.44 m/s², 5 Hz - 200 Hz (EN 61373)
Shock50 m/s², 30 ms (EN 61373)
MTBFmin. 600 000h @ 40°C according to IEC/TR 62380 (RDF 2000)
• PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers

Electrical Safety
• EN 60950-1
• Insulation measurement test according to EN 50155 (
• Voltage withstand test according to EN 50155 (
EMCEMC Emission:
• EN 55022: CISPR 22 - Class B
• FCC 15.109 and S-9401
EMC Immunity: EN 55024 - Class A

EN 55011 (radio disturbance)
IEC 61000-4-2 (ESD)
IEC 61000-4-3 (electromagnetic field immunity)
IEC 61000-4-4 (burst)
IEC 61000-4-5 (surge)
IEC 61000-4-6 (conducted disturbances)
Warranty2 Years



120 W, 3U 6HP PSU, wide range input 100 to 240VAC, output 12, 5, 3.3 VDC, -40 to +85°C with qualified components, conformal coating
Recab UK
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