Solid State Relay SSR 10A 25A 40A DC to AC White Shell

Solid State Relay (SSR) – DC Control AC | 10A, 25A & 40A Options

Upgrade your electrical control setup with this reliable Solid State Relay (SSR) featuring DC input and AC output switching. Available in 10DA, 25DA, and 40DA current ratings, this SSR is engineered for fast, silent, and efficient switching — with no moving parts to wear out over time. The clean white shell design makes installation and identification straightforward in any panel or enclosure.

Whether you're automating a heating element, controlling industrial equipment, or building a DIY electronics project, this solid state relay delivers consistent, long-lasting performance across a wide range of applications.

Key Features

• Multiple Current Ratings: Choose from 10A, 25A, or 40A to match your load requirements precisely
• DC Control Input: Low-voltage DC signal (3–32V DC) controls high-voltage AC output (24–380V AC)
• No Mechanical Contacts: Silent, spark-free switching extends operational life significantly versus traditional electromechanical relays
• White Plastic Shell: Durable housing protects internal components; easy to label and identify in control panels
• Single Phase: Designed for single-phase AC load control
• Wide Input Voltage Range: Compatible with microcontrollers, PLCs, and other low-voltage DC signal sources
• Easy DIN Rail or Panel Mounting: Compact form factor fits standard electrical enclosures
• Fast Switching Response: Zero-crossing turn-on minimizes electrical noise and interference

Specifications

• Control Input: 3–32V DC
• Output: 24–380V AC
• Current Options: 10A (SSR-10DA), 25A (SSR-25DA), 40A (SSR-40DA)
• Type: Single Phase, DC to AC
• Shell Color: White
• Cover: Without plastic cover
• Switching Method: Zero-crossing

Ideal Applications

• Temperature controllers & PID systems
• Home automation & smart home builds
• Industrial machinery & motor control
• 3D printers & CNC equipment
• Lighting control systems
• Heating & cooling equipment switching

For more information on electrical safety and best practices for wiring solid state relays in control systems, visit OSHA Electrical Safety and CPSC Electrical Safety Resources.

Frequently Asked Questions

Q: What is a Solid State Relay (SSR) and how does it differ from a mechanical relay?

A: A Solid State Relay (SSR) is an electronic switching device that uses semiconductor components instead of mechanical contacts to switch loads on and off. Unlike traditional electromechanical relays, SSRs have no moving parts, which means they operate silently, generate less electrical noise, and typically have a much longer service life. This SSR-10DA/25DA/40DA accepts a low-voltage DC control signal (3–32V DC) and switches a high-voltage AC load (24–380V AC).

Q: Which current rating (10A, 25A, or 40A) should I choose for my application?

A: Select your SSR rating based on the maximum current your AC load will draw. As a general rule, choose a relay rated at least 1.5–2x the actual load current for thermal headroom and longevity. For example, if your load draws 8A, the SSR-10DA is suitable for lighter use, but the SSR-25DA would provide more overhead. For heavy loads such as large heating elements or motors, the SSR-40DA is recommended.

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

A: For loads above approximately 3–5A, using a heatsink is strongly recommended. SSRs generate heat during operation, and adequate thermal management ensures optimal performance and extends the relay's operational lifespan. The SSR-25DA and SSR-40DA in particular should be mounted on a heatsink or thermally conductive surface for sustained high-current applications.

Q: Is this SSR compatible with Arduino, Raspberry Pi, or PLC systems?

A: Yes. The 3–32V DC control input range is compatible with most microcontrollers (including Arduino, ESP32, and Raspberry Pi GPIO via a logic-level driver) and PLC output modules. Always verify your control signal voltage and current output meet the SSR's minimum trigger requirements before wiring.