TECHNICAL DATASHEET
Medical AC-DC Open Frame Power Supply
24V 250W with 5V/0.5A Standby / MDS-250A series
MDS-250A Series
Highlights & Features
Safety Approvals to IEC 60601-1 3.1rd ed. & IEC 60950-1
Compliant with IEC 60601-1-2 4th Ed. Requirements
Up to 150 Watt Convection
Up to 500 K Hrs MTBF
Suited for Type BF Medical Products
2 MOPP isolation
Safety Standards
CB Certified for worldwide use
Model Number: MDS-250A
Unit Weight: 405g (MDS-250APB24)
610g (MDS-250ADB24)
Dimensions (W x L x H):
76.5x127.3x36.1mm 3x5x1.4 inch (MDS-250APB24)
88.9x140.0x44.4mm 3.5x5.5x1.75 inch (MDS-250ADB24)
General Description
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Deltas new MDS-250APB24 open frame design offers a high energy density (12 Watts/in ) 3x5 inch design for Type BF patient
access medical products. With operating parameters of 90 to 264 Vac universal input voltage, temperatures of -10 to +70
degrees centigrade, and altitudes of up to 5000 meters (16,400 feet), the design is well suited for a variety of both
medical and non-medical applications. Other features include input surge of 300 Vac, low leakage current, no-load input
power < 0.5 Watt, and 500K hour MTBF. This product is certified for EMC standards EN 55011 for industrial, scientific
and medical (ISM) radio-frequency equipment, and EN 55022 for Industrial Technology Equipment (ITE) radio-frequency
equipment. In addition, only recognized Japanese capacitors are used to ensure long product life.
An enhanced feature set, includes a 5 Volt/0.5 amp standby output, remote on/off, remote sense, and a power good
signal that are included as part of the standard product.
The design, which has protection against shock compliant with 2XMOPP and Type BF requirements, has both medical
(with risk report available), and ITE safety approvals, including cURus(US&Canada) /TUV/GB(China); plus, CB
certificates with all national deviations. Full compliance with RoHS Directive 2011/65/EU for environmental protection is
included. The unit comes in a standard 3x5 inch footprint, with height suitable for 1U applications. Robust terminals are
capable of multiple connections of the main output to the end product. Enclosed assembly is available option.
Model Information (All with 5V/0.5A standby available)
Model Number Input Voltage Output Voltage Convection Current Forced Air Current Output
MDS-250APB24 AA 90-264Vac 24Vdc 0-6.25A 0-10.41A (with 10CFM forced air)
MDS-250ADB24 AA (Enclosed cover) 90-264Vac 24Vdc 0-5.62A 0-10.41A (with 10CFM forced air)
MDS 250 A B 24
Delta Medical Max wattage in the Family Code Product Type Input Type Code Output Voltage Revision code,
Power Supply product series. P:Open Frame B: 3pin Class I 24 for 24V Refer to page.10
A Z
250 250W D: Enclosed
All parameters are specified at 25C ambient unless otherwise noted.
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www.DeltaPSU.com (February 2019, Rev. 11)
TECHNICAL DATASHEET
Medical AC-DC Open Frame Power Supply
24V 250W with 5V/0.5A Standby / MDS-250A series
Specifications
Input Ratings / Characteristics
Nominal Input Voltage 100-240Vac
Input Voltage Range 90-264Vac
Nominal Input Frequency 50-60Hz
Input Frequency Range 47-63Hz
Input Current (max) 3.5A
Input Surge Voltage (max) 300Vac for 100ms
Full load Efficiency (typ.) 91.85% @ 115Vac/60Hz
92.98% @ 230Vac/50Hz, Reference Fig.1
Standby Power (max) 0.5W (Inhibit signal high, 24 volt turned off)
@ 115Vac/60Hz, 230Vac/50Hz
Inrush Current (max) 40A @ 230Vac, cold start
1) 1)
Input-PE(protective earth) leakage current (max) 0.1mA @ NC , 0.3mA @ SFC
1) 1)
Output-PE(protective earth) leakage current for Type BF application (max) 0.1mA @ NC , 0.5mA @ SFC
Power Factor (min) @ 115V/50Hz, 230V/50Hz, full load
1) NC: normal condition, SFC: single fault condition
Leakage Current
Input-PE Leakage Current 100Vac/60Hz (Typ) 264Vac/60Hz(Typ) Delta Limit IEC60601-1 Limit
Normal Condition 17.4uA 43.3uA 100uA max 5000uA max
Single Fault Condition 32.7uA 90.6uA 300uA max 10000uA max
Output-PE Leakage Current for Type BF application
Normal Condition 28.3uA 86.6uA 100uA max 100uA max
Single Fault Condition 42.8uA 128.4uA 500uA max 500uA max
Fig.1 Efficiency versus output load
All parameters are specified at 25C ambient unless otherwise noted.
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www.DeltaPSU.com (February 2019, Rev. 11)