Industrial solid-state relays with excellent reliability and efficiency

Littelfuse, Inc. has released the SRP1 Solid-State Relays (SSRs) family. Engineered to meet end-user demand for more reliable and durable switching components in industrial and commercial machinery applications, the SSRs offer unparalleled reliability, improved durability, and prolonged operational lifespan even in the most demanding environments.

Conventional relays have long been beset by mechanical failures under constant and prolonged use. Recognising this critical issue, the company developed the SRP1 SSRs, focusing on reliability and longevity. These solid-state relays eradicate the vulnerabilities associated with mechanical components, delivering a robust alternative that ensures consistent performance in demanding industrial and commercial settings.

At the heart of the SSRs lies a proprietary, improved power component designed by the company. This tailor-made component is engineered to provide optimal performance even under strenuous conditions, ensuring improved reliability and a longer lifespan for the relay. By resisting heat degradation, the power component greatly lessens the likelihood of failure, minimising downtime and improving overall productivity in machinery and applications.

"With the launch of our new solid-state relay series, we are excited to offer our customers a solution that addresses their needs for more robust and efficient systems," said Hugo Neri, global product manager of Industrial Solid-State Relays at Littelfuse. "This product is set to minimise operational disruptions and maintenance, providing peace of mind in various applications, ensuring that our customers can focus on what they do best."

The solid-state relays provide:

High-Endurance Design: Delivers enhanced operational reliability and extended service life, up to ~750K life stress cycles, ensuring consistent performance even in demanding conditions. (Up to ~350K life stress cycles for basic SRP1 relays.)

Versatile Performance Range: With ratings from 10A to 90A at low or high voltage and the flexibility of AC or DC control, the series caters to a wide array of power requirements. The Zero Voltage and Instantaneous (Random) turn-on options ensure precise control for various applications, enhancing efficiency and compatibility.

Integrated Protection and Installation Features: Includes IP20 finger-safe protection and overvoltage protection, facilitating straightforward and secure installation.

Compliance with International Standards: Ensures that the SSR has undergone rigorous testing, providing enhanced safety and product quality.

The SSRs are available in five configurations:

SRP1-CR – All-in-one SSRs with Touch-safe and overvoltage protection

SRP1-CB – Basic SSRs for application design flexibility

SRP1-CB…F – Quick-connect terminals for fast installation

SRP1-CE – Basic SSRs for simple heating applications

SRP1-CC – Ideal for DC voltage load applications.

Typical markets and applications for the SRRs include Industrial Automation – Plastic machinery, packaging machinery, and industrial ovens; and HVAC – Electric heating in air handling units, rooftop units, and variable air units; Food and Beverage – Cooking ovens, coffee machines, warming trays, and warming displays.