FOTEK Yangming Single Phase Solid State Relay KSR 25DA 40DA 75DA

Yangming FOTEK Single Phase Solid State Relay – KSR Series

Upgrade your electrical control systems with the Yangming FOTEK Single Phase Solid State Relay (KSR Series). Available in multiple current ratings — 25DA, 40DA, 75DA, and 40DAE-H — these solid state relays deliver fast, silent switching with no moving parts, making them ideal for industrial automation, temperature control panels, machinery, and DIY electronics projects.

Unlike mechanical relays, solid state relays (SSRs) offer zero contact bounce, longer operational life, and near-instantaneous switching response. The KSR series is a trusted choice among engineers and hobbyists seeking reliable single-phase AC load control from a low-voltage DC input signal.

Key Features

Multiple Variants: Choose from 25DA, 40DA, 75DA, or 40DAE-H to match your current load requirements
Single Phase Design: Controls single-phase AC loads with precision and consistency
No Moving Parts: Fully solid state construction for silent operation and extended service life
Plastic Housing: Durable, lightweight enclosure for easy panel mounting
Fast Switching Response: Near-zero switching delay for time-critical applications
Wide Compatibility: Compatible with standard industrial control signals (DC input)
Drop-in Replacement: Suitable as a replacement part for existing FOTEK/Yangming SSR installations

Specifications

Brand: Yangming / FOTEK
Series: KSR (25DA, 40DA, 75DA, 40DAE-H)
Type: Single Phase Solid State Relay
Housing Material: Plastic
Made in: Mainland China

Typical Applications

Industrial automation and PLC control panels
Temperature controllers and ovens
Motor and heater control circuits
DIY electronics and maker projects
Replacement parts for existing SSR installations

Learn More About Solid State Relays & Electrical Safety

For safety guidelines when working with electrical control components, refer to OSHA's Electrical Safety Standards. For technical standards on electronic components, visit NIST Electronics Research.

Frequently Asked Questions

Q: What is the difference between the KSR 25DA, 40DA, 75DA, and 40DAE-H variants?

A: The number refers to the maximum load current rating in amperes (e.g., 25DA = 25A, 40DA = 40A, 75DA = 75A). The "40DAE-H" is an enhanced variant of the 40A model with additional features or thermal characteristics. Choose the rating that matches or exceeds your circuit's load current requirements for safe and reliable operation.

Q: Is this solid state relay compatible with standard PLC or temperature controller outputs?

A: Yes. The Yangming FOTEK KSR series is designed to be triggered by standard low-voltage DC control signals (typically 3–32V DC), making it directly compatible with most PLCs, temperature controllers, and microcontroller outputs without additional interface circuitry.

Q: Do I need a heat sink with this solid state relay?

A: For applications running at or near the relay's rated current, mounting to an appropriately sized heat sink is strongly recommended to maintain safe operating temperatures and maximize the lifespan of the component. At lower loads, natural convection may be sufficient.

Q: Is this a genuine FOTEK / Yangming relay?

A: This product is listed as an original Yangming FOTEK KSR series single phase solid state relay, suitable for use as a new or replacement part in compatible installations.