DC-DC Solid State Relay SSR 10DD 25DD 40DD Single Phase CE

DC-DC Single Phase Solid State Relay – SSR 10DD / 25DD / 40DD

Upgrade your automation projects with this high-performance DC-controlled DC Solid State Relay (SSR). Available in 10A, 25A, and 40A ratings, this white-shell SSR features an epoxy-protected design with no moving contacts — meaning silent, spark-free, and ultra-reliable switching for a wide range of industrial and commercial control applications. Made in China.

Key Features

• High Reliability & Long Lifespan: Solid-state construction eliminates mechanical wear for consistent, long-term performance.
• Spark-Free & Silent Operation: No electric arcs, no noise — ideal for sensitive environments.
• Low Electromagnetic Interference: High sensitivity and fast switching speed minimise signal disruption.
• Low Drive Voltage & Current: Input control voltage of 3–32V DC; control current just 3–35mA.
• Epoxy-Protected Housing: Excellent resistance to moisture, dust, and corrosion — built for harsh environments.
• LED Status Indicator: Quickly confirm on/off operating state at a glance.
• CE Certified: Meets European conformity standards for safety and quality.

Specifications (SSR-40DD Model)

Available Models

• SSR-10DD (10A)
• SSR-25DD (25A)
• SSR-40DD (40A)
• SSR-50DD, SSR-60DD, SSR-80DD, SSR-100DD also available

Typical Applications

• Industrial automation and PLC control systems
• Stage lighting control
• Medical instrument switching
• DC motor control
• Computer peripheral connections
• Automatic fire and safety systems
• Traffic signals, street lights, and signal lighting

What's in the Box

• 1 × Solid State Relay (SSR) — white shell, no plastic cover

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Frequently Asked Questions

Q: What is the difference between SSR-10DD, SSR-25DD, and SSR-40DD solid state relays?

A: The numbers refer to the maximum output current rating. The SSR-10DD handles up to 10 amps, the SSR-25DD up to 25 amps, and the SSR-40DD up to 40 amps. All three are DC-controlled DC (DC–DC) models sharing the same input voltage range of 3–32V DC and output load voltage of 5–60V DC. Choose your model based on the current requirements of your specific circuit or load.

Q: Do these solid state relays require a heat sink?

A: For higher current applications (especially the 40A model and above), mounting the SSR on a suitable heat sink is strongly recommended to maintain safe operating temperatures and extend the relay's lifespan. The bolted fixing method makes it straightforward to attach to an aluminium heat sink plate.

Q: What does "without plastic cover" mean for this SSR?

A: "Without plastic cover" means the relay uses an open white metal/epoxy shell design rather than a fully enclosed plastic housing. This allows for better heat dissipation and direct mounting to heat sinks, making it the preferred choice for panel-mount and industrial automation installations.

Q: Is this solid state relay suitable for outdoor or harsh environments?

A: Yes. The epoxy-protected construction provides resistance to moisture, dust, and mild corrosion, making it well-suited for use in demanding industrial settings. For fully outdoor, weather-exposed installations, additional IP-rated enclosure protection is recommended.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.