The MEAN WELL RSDH-300-48 is an enclosed DC/DC converter with a 250–1500 VDC input and a 48 V, 6.25 A output rated at 300 W. Its fanless, half-encapsulated construction provides reinforced 4 kVAC input-to-output isolation in a 41 mm-high enclosure. Output voltage is adjustable over 48–58 V. Select the load using the input-voltage, ambient-temperature and altitude curves, and fit the required external 4 A / 1500 VDC input fuse.
Product Datasheet
Download MEAN WELL RSDH-300 Datasheet (PDF)
The RSDH-300 section is on PDF pages 44, 45, 46, 47. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
Full model
RSDH-300-48
Series
RSDH-300
DC output voltage
48 V
Rated output current
6.25 A
Rated output power
300 W
Output current range
0–6.25 A
Output voltage adjustment range
48–58 V
Maximum ripple and noise
300 mVp-p
Voltage tolerance
±1.0%
Line regulation
±0.5%
Load regulation
±1.0%
Maximum external capacitive load
2000 µF
The final model suffix identifies the nominal output voltage. Use the +ADJ control to set the output within the specified range, while keeping the current, power and environmental limits.
Suitable applications include photovoltaic and renewable-energy equipment, high-voltage frequency conversion, industrial control, semiconductor fabrication, electromechanical equipment, centralized DC buses, energy storage and charging infrastructure. Third-rail use is listed as an application; system-level installation and qualification remain application-specific.
DC Input and Efficiency
Continuous DC input range
250–1500 VDC
Input range ratio
6:1
Surge input withstand
1700 VDC for 10 seconds
Typical efficiency at 300 VDC
91%
Typical efficiency at 800 VDC
91%
Typical efficiency at 1500 VDC
87%
Maximum cold-start inrush current
500 A at 1500 VDC; 300 A at 800 VDC; 120 A at 300 VDC
Required external input fuse
4 A / 1500 VDC
Normal measurement conditions
800 VDC input, rated load and 25°C ambient
Nominal switching frequency
65 kHz
The 1700 VDC statement is a 10-second surge-withstand condition, not an extension of the continuous input range. Input-dependent load limits also apply within the 250–1500 VDC operating range.
Ripple and noise are measured at 20 MHz bandwidth using 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.
Protection and Recovery
Protection functions
Short circuit, overload, overvoltage, overtemperature, DC input undervoltage and reverse polarity
Overload threshold
105–135% of rated output power
Overload with output below 55% of rated voltage
Hiccup mode; automatic recovery after the fault is removed
Overload with output at 55–100% of rated voltage
Constant-current limiting; automatic recovery after the fault is removed
Output overvoltage threshold
62–70 V
Overvoltage recovery
Hiccup mode; automatic recovery after the fault is removed
Overtemperature recovery
Hiccup mode; automatic recovery after the fault is removed
Input reverse-polarity protection
Internal bridge diode; no damage, with automatic recovery after the fault is removed
Input undervoltage protection range
200–225 VDC
Input undervoltage release range
225–246.5 VDC
Undervoltage protection and release thresholds describe the protective response. They do not lower the 250 VDC minimum continuous operating input or remove the input-voltage derating requirement.
Correct the fault before returning to normal service. Use the external input fuse specified for this converter in addition to its internal electronic protection.
Cooling and Ambient-Temperature Derating
Construction and cooling
Half encapsulated; fanless free-air convection
Published curve orientation
Vertical
Working ambient range
−40 to +80°C, subject to derating
Load at −40°C
50%
Full-load ambient interval
0–55°C
Load at 70°C
55%
Load at 75°C
40%
Load at 80°C
30%
Follow the plotted transition from 50% load at −40°C to 100% at 0°C. Above 55°C, reduce the load along the thermal curve through the stated 70°C, 75°C and 80°C points. The maximum ambient temperature does not permit full rated output.
Install the unit in the orientation used by the curves and maintain free convection around the enclosure. Leave access and clearance for power wiring, the fuse holder and the adjustment control.
Input-Voltage and Altitude Derating
Load at 250 VDC
40%
Load at 300 VDC
80%
Full-load input interval
320–1400 VDC
Load at 1500 VDC
80%
Maximum operating altitude
5000 m
Altitude load factor through 2000 m
100%
Altitude load factor at 5000 m
45%
Altitude temperature adjustment
Above 2000 m, reduce permissible ambient temperature by 3.5°C per additional 1000 m
Overvoltage category condition
OVC II at 2000 m, according to EN 62109-1
Use the rising input curve from 250 to 320 VDC and the falling curve from 1400 to 1500 VDC; full output is available only where the other operating limits also allow it.
Above 2000 m, the altitude curve decreases from 100% to 45% at 5000 m. Multiply this altitude factor by the regular power-limit factor. Apply the ambient-temperature adjustment as well; the altitude rating and OVC II reference describe different conditions.
Terminal Assignment and Installation
TB1 pin 1
DC input +Vin
TB1 pin 2
DC input −Vin
TB2 pin 1
FG / protective earth
TB2 pin 2
DC output −Vo
TB2 pin 3
DC output +Vo
Output adjustment control
+ADJ
Case reference
270D
Catalogue dimensions, L × W × H
237 × 100 × 41 mm
Enclosure height
41 mm / 1U low profile
Drawing tolerance
±1 mm
Mounting references
229 mm longitudinal reference; 83.5 mm and 84 mm transverse references on the marked sides. Mounting callouts are Ø5.2, L = 6.6 mm and 3 × Ø4.2, L = 6 mm at the indicated positions.
Use the numbered terminal assignments for this model. Connect the marked FG terminal to the installation protective-earth system. Keep the input and output circuits distinct and select conductors and terminations for the applicable voltage and current.
Place the required external fuse and holder in the positive DC input lead as shown in the wiring diagram. Follow the mechanical drawing for the mounting points; enclosure dimensions do not include external wiring and cable-bend clearance.
Required Fuse and Compatible Ordering Reference
External fuse specification
4 A / 1500 VDC
Suggested fuse manufacturer
WalterFuse
Fuse manufacturer part number
WJ30-4
Fuse-holder manufacturer part number
WJ30-H
MEAN WELL fuse-plus-holder ordering reference
WJ30-4_WJ30-H
Accessory function
External input fuse and holder for the positive DC input lead
Select the listed fuse-and-holder combination, or confirm a suitable equivalent for the required DC voltage and current rating. Confirm the accessory supply separately when ordering the converter.
Environmental, Reliability and Mass Data
Working humidity
20–90% RH, non-condensing
Storage temperature and humidity
−40 to +80°C; 10–95% RH, non-condensing
Temperature coefficient
±0.03%/°C over 0–55°C
Component vibration
10–500 Hz, 3 G; 10 minutes per cycle and 60 minutes on each X, Y and Z axis
Mounting-clip vibration reference
IEC 60068-2-6
Minimum MTBF, Telcordia SR-332
277.9K hours
Minimum MTBF, MIL-HDBK-217F
99.1K hours at 25°C
Unit mass, catalogue PACKING reference
1100 g
Catalogue packing
1.1 kg; 10 units / 12.7 kg / 0.8 CUFT
Catalogue warranty
3 years
The mass is the explicit per-unit catalogue packing reference. It is not a measured installed mass or the gross shipping weight of an individual parcel.
Safety, Isolation and EMC
Catalogue-listed safety approvals
UL 1741; CSA C22.2 No.107.1-16; IEC 62109-1; BS EN / EN 62109-1; EAC TP TC 004
Input-to-output withstand voltage
4 kVAC; reinforced isolation
Input-to-FG withstand voltage
3.75 kVAC
Output-to-FG withstand voltage
2 kVAC
Input-to-output isolation resistance
100 MΩ at 500 VDC, 25°C and 70% RH
Conducted emissions
BS EN / EN 55032 (CISPR 32), Class A
Radiated emissions
BS EN / EN 55032 (CISPR 32), Class A
Immunity standards
BS EN / EN 55035; BS EN / EN 61000-6-2
ESD, EN 61000-4-2
Level 3, 8 kV air; level 2, 4 kV contact; criterion A
Radiated susceptibility, EN 61000-4-3
Level 3; criterion A
EFT/burst, EN 61000-4-4
Level 3, 2 kV; criterion A
Surge, EN 61000-4-5
Level 4; 2 kV between +Vin and −Vin, 4 kV between input and FG
Conducted immunity, EN 61000-4-6
Level 3, 10 V; criterion A
Magnetic field, EN 61000-4-8
Level 4; criterion A
The converter is a component intended for installation in final equipment. Reconfirm the complete equipment’s EMC compliance after integration. Component approvals and isolation ratings do not certify the complete system.
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