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Mean Well DDR-120B-24 DC-DC Converter - 120W - 16.8~33.6V in 24V out
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Description
Description
The DDR-120B is a 120W DIN Rail type DC-DC converter for railway and industrial applications. With a 16.8~33.6Vdc input range (nominal 24Vdc), it converts from 24Vdc on-board bus supplies to isolated 12V, 24V, or 48V outputs. Compliant with EN50155:2021 S1 level and rated per IEC61373 for shock and vibration, it operates from -40~+70°C in demanding transport environments.
Key Features
- ✓ Input voltage range: 16.8~33.6Vdc (nominal 24Vdc)
- ✓ 32mm width — DIN rail TS-35 compatible
- ✓ DC output voltage adjustable ±10%
- ✓ 4KVdc reinforced I/O isolation
- ✓ Wide operating temperature: -40°C ~ +70°C
- ✓ Protections: Overload / Over voltage / Reverse polarity / Under voltage lockout
- ✓ EN50155:2021 S1 level compliance (interruption of voltage supply)
- ✓ Railway standards: EN45545-2 (fire protection), EN50155 / IEC60571, IEC61373 (shock & vibration)
- ✓ Safety approvals: IEC 62368-1, UL 62368-1, AS/NZS 62368.1, EAC TP TC 004
- ✓ 3 years warranty
Specifications
Specifications
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BrandMean Well
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SeriesDDR Series
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Power Rating120 Watt
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Output Voltage24 Volt
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Rated Current5 Ampere
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Input Voltage16.8V~33.6V
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Standards MetCE,EMC
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Operation ModeConstant Voltage
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Operating Temperature-40°C~85°C
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Warranty2 Year
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Length12.52 cm
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Width10.2 cm
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Height3.2 cm
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Weight0.51 kg
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Frequently Asked Questions
Can I use the DDR-120B-24 to power 24V automation devices from a 24V battery-backed bus?
Yes. The DDR-120B-24 accepts 16–33V DC input and provides an isolated 24V output at up to 5A (120W). This is useful when you need galvanic isolation between a 24V UPS or battery bus and sensitive 24V PLC, relay, or sensor circuits to prevent ground loops and noise coupling.
Is the DDR-120B-24 suitable for powering 24V actuators and valve controllers in process plants?
The DDR-120B-24 delivers 24V at 5A (120W) with 4KVdc isolation from a 16–33V input bus. This capacity handles most individual actuator or valve controller loads. The -40°C to +85°C range and fanless design suit harsh plant environments without requiring additional cooling.
Can I use this converter to create an isolated 24V supply for a DIN rail data acquisition system?
The DDR-120B-24 is well suited for this. Its 4KVdc input-to-output isolation prevents noise from the main DC bus from reaching sensitive analog measurement circuits. At 120W, it can power a data logger, signal conditioners, and several analog input modules simultaneously.
Does the DDR-120B-24 require derating at elevated temperatures inside a control cabinet?
The DDR-120B-24 is rated for operation up to +85°C, but like most power converters it may derate output at the upper end of its temperature range. At typical cabinet temperatures of 40–50°C, you can expect full 120W output. Consult the derating curve in the datasheet for exact values above 70°C.
Is the DDR-120B-24 a good choice for powering 24V LED panel indicators from a 24V DC bus?
While it works for that purpose, the DDR-120B-24 provides 120W at 5A, which is significantly more than most LED indicator panels require. If your indicator load is only a few watts, a smaller model like the DDR-15G-24 (15W) or DDR-30G-24 (30W) may be more cost-effective and space-efficient.
Other DDR-120B Models
2 other models| Model | Power | Voltage | Current | IP Rating | |
|---|---|---|---|---|---|
| Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out | 120W | 48V | 2.5A | Indoor | View |
| Mean Well DDR-120B-12 DC-DC Converter - 120W - 16.8~33.6V in 12V out | 120W | 12V | 10A | Indoor | View |
