FOTEK SSR-75DA Solid State Relay 75A DC to AC Control

FOTEK SSR-75DA Solid State Relay – Reliable 75A DC-Controlled Switching

The FOTEK SSR-75DA Solid State Relay is a high-capacity, industrial-grade switching component designed for demanding electrical control applications. With a 75-amp load rating and DC input control, this solid state relay (SSR) offers fast, silent, and spark-free switching — making it a dependable choice for temperature controllers, industrial automation, heating systems, and more.

Unlike traditional mechanical relays, solid state relays have no moving parts, resulting in longer service life, reduced electrical noise, and faster response times. The SSR-75DA is compatible with a wide range of control systems including PID temperature controllers, PLCs, and microcontrollers.

Key Features

• Model: SSR-75DA (DC Input, AC Output)
• Load Capacity: 75 Amps
• Control Input: DC signal (typically 3–32V DC)
• Output: AC load switching
• Material: Durable plastic housing
• No moving parts — silent, long-lasting operation
• Fast switching response for precise control
• Wide compatibility with PID controllers, PLCs, and automation systems
• Made in Mainland China

Common Applications

• Industrial heating and temperature control systems
• PID temperature controller output stages
• CNC machine tool control
• Plastic molding and packaging equipment
• Automation and motor control panels

Why Choose a Solid State Relay?

Solid state relays provide several advantages over electromechanical relays: they generate less electromagnetic interference (EMI), require no maintenance, switch silently, and deliver consistent performance over millions of switching cycles. For applications requiring frequent on/off cycling or precise load control, the SSR-75DA is an excellent solution.

For more information on electrical safety standards and best practices when working with high-current switching components, visit OSHA Electrical Safety Guidelines.

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Frequently Asked Questions

Q: What does SSR-75DA mean on a solid state relay?

A: The designation SSR-75DA indicates a Solid State Relay with a 75-amp load capacity, a DC control input, and an AC output switching capability. It is designed to be triggered by a low-voltage DC signal (typically 3–32V DC) to switch high-voltage AC loads up to 75 amps.

Q: Is the FOTEK SSR-75DA compatible with PID temperature controllers?

A: Yes. The FOTEK SSR-75DA solid state relay is widely used as the output stage for PID temperature controllers. Its DC-compatible control input works seamlessly with the relay output terminals found on most standard PID controllers used in heating, kiln, and process control applications.

Q: Does this solid state relay require a heat sink?

A: At high load currents (especially above 25–30A continuous), it is strongly recommended to mount the SSR-75DA on an appropriate aluminum heat sink to dissipate thermal energy and ensure reliable long-term operation. Operating without a heat sink at full load may reduce the lifespan of the relay.