Best DC to DC SSR Solutions for Reliable Control Systems
DC-DC solid state relays (SSRs) enable fast, quiet, and reliable switching for voltage-controlled applications. This article examines practical DC-to-DC SSRs that support 3-32V input and 5-60V output, highlighting five suitable options. Each product is evaluated by size, current rating, insulation, and mounting needs to help designers choose the right device for heating, cooling, and automation projects. The following summary table lists the chosen products and their key attributes to compare at a glance.
| Product | Brand | Input | Output | Current Rating | Notes |
|---|---|---|---|---|---|
| SSR-25DD (DC to DC) | CGELE | 3-32V DC | 5-60V DC | 25A | Plastic cover; includes thermal grease |
| SSR-40DD (DC to DC) | Coliao | 3-32V DC | 5-60V DC | 40A | Single phase; compact size |
| SSR-25DD (DC to DC) | DMWD | 3-32V DC | 5-60V DC | 25A | Rugged epoxy encapsulation; high isolation |
| SSR-25DD (DC to DC) | BlueStars | 3-32V DC | 5-200V DC | 25A | Pack of 2; detailed install guidance |
| SSR-25DD (DC to DC) | TWTADE | 3-32V DC | 5-60V DC | 25A | Includes heat sink option |
CGELE SSR-25DD DC to DC 25A
The CGELE SSR-25DD models operate with a 3-32V DC input and provide a DC output in the 5-60V range, suitable for compact DC motor or heater control. A practical feature is the inclusion of two thermal grease sachets to improve heat dissipation when mounted to a surface. Dimensions are compact (roughly 58 x 45 x 32 mm) with a weight around 116 g, using metal and plastic construction. This device is designed for single-phase operation at 50/60 Hz and offers a robust 25A switching capability for moderate loads.
Coliao SSR-40DD DC to DC 40A
The Coliao SSR-40DD provides a higher current rating (40A) with the same DC input range (3-32V) and DC output (5-60V), enabling it to switch larger loads. Its compact dimensions (62 x 45 x 24 mm) make it suitable for space-constrained control panels. The module is intended for single-phase operation at 50/60 Hz and is designed for easy integration into automation or process control circuits that require reliable solid-state switching with DC-to-DC transitions.
DMWD SSR-25DD DC to DC 25A
DMWD’s SSR-25DD model is a 25A DC-to-DC solid-state relay with robust protection features. It features CE compliance to EN60950-1, and a high isolation resistance greater than 50 MΩ at 500VDC, along with a dielectric rating above 2.5 kV. The enclosure uses rugged epoxy encapsulation to withstand industrial environments, and an internal snubber circuit provides protection against voltage spikes. This option is well-suited for reliable control of DC loads in automation or heating systems where steady performance is essential.
CGELE SSR-25DA DC to AC 25A
The SSR-25DA from CGELE expands the DC-to-AC switching capability, offering 24-480VAC output while maintaining the same DC input range of 3-32V. This makes it suitable for AC-powered loads controlled from a low-voltage DC signal. The device mirrors the compact and lightweight design of other CGELE SSRs and includes the same small form factor and 25A rating, making it a versatile option for mixed-load applications that require seamless DC-to-AC switching in automation setups.
BlueStars SSR-25DD Pack
BlueStars offers the SSR-25DD (DC to DC) in a pack of two, emphasizing optimized performance with detailed installation instructions. The 3-32V DC input and 5-200V DC output range covers a broad span of DC control needs, with a 25A current rating and a compact 58 x 45 x 32 mm profile. The kit includes guidance that helps ensure proper thermal management and reliability in demanding environments, making it a practical choice for pilots, hobbyist projects, or small-scale industrial controls.
TWTADE SSR-25 DD DC to DC with Heat Sink
TWTADE’s SSR-25DD is designed for DC-to-DC switching with a 3-32V input and 5-60V output, rated at 25A. An important note is the heat management guidance: the unit may require a larger heat sink or fan for high-load, sustained use. The product is commonly paired with a separate heat-sinking solution to maintain temperature within safe limits, ensuring stable operation in continuous-duty applications such as automation and heating/cooling control systems.
Buying Guide: Key Considerations For DC To DC SSRs
When selecting a DC-to-DC SSR, consider these core factors to match the device to your application:
- Load current and voltage: Ensure the SSR’s current rating exceeds the peak load and that the output voltage range covers your actuators or heaters.
- Input control range: Most DC-DC SSRs accept 3-32V DC; verify compatibility with your control electronics and logic levels.
- Heat dissipation: Solid-state relays generate heat; choose models with adequate heat sinking or plan for external cooling in high-load scenarios.
- Isolation and safety: Look for high insulation resistance and dielectric strength to withstand transient spikes common in motor and heater circuits.
- Enclosure and mounting: Plastic versus metal housings affect durability and EMI; consider enclosure IP rating for damp or dusty environments.
- Snubber and protection: Built-in snubber circuits help suppress voltage spikes; assess the need for additional EMI/RFI considerations in your system.
- Package and form factor: Space constraints may dictate the use of compact modules or the necessity of separate heat sinks and mounting hardware.
Versatility and redundancy also matter. Some vendors offer multi-pack options, convenient for bulk installations or spare units. If your project involves continuous operation, prioritize models with robust isolation, proven long-term reliability, and clear installation guidance.
In choosing between DC-to-DC modules and DC-to-AC variants, align with the load type you’re controlling. For DC-powered fans, pumps, or heaters, a DC-DC SSR provides clean electronic switching. If the load is AC-based, consider a DC-to-AC module with appropriate voltage and frequency specifications. Always confirm the exact input and output ranges before integrating into a live system to avoid mismatches and potential equipment damage.