Solid State Relay AC for Temperature Controllers | 100A, CE Certified

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High-Performance Solid State Relay AC Solutions for Reliable Industrial Automation

Zhejiang Suosite Electrical Technology Co., Ltd. presents a comprehensive range of solid state relay AC products engineered for demanding industrial environments. Our solid state relays (SSRs) offer superior switching performance, long operational life, and excellent thermal management, ensuring precise control in heating, lighting, and motor control applications. Designed with advanced semiconductor technology, our AC SSRs provide fast, noise-free switching with zero-crossing or random-on options, reducing electrical stress and electromagnetic interference. With CE certification and stringent quality control, our relays deliver consistent performance in temperatures ranging from -40°C to +80°C, and support AC loads up to 600V and 100A. Whether for packaging machinery, plastic injection molding, or HVAC systems, our solid state relay AC products are the trusted choice for engineers seeking reliability and efficiency.
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Case Study

Robust Thermal and Electrical Performance

Our solid state relay AC products are designed to handle high current surges and voltage transients, ensuring reliable operation in harsh industrial conditions. With integrated over-temperature protection and advanced thermal management, these relays maintain stable performance even under continuous load. The use of high-grade SCR and TRIAC components, coupled with copper baseplates and proper heat sinking, minimizes thermal resistance and extends operational lifespan. Additionally, our relays feature IP20 protection and are available with built-in snubber circuits to suppress voltage spikes, reducing the risk of false triggering. This robustness translates to fewer failures, reduced downtime, and lower total cost of ownership for your applications.

Precision Control and Energy Efficiency

Our solid state relay AC units offer precise control over AC loads, with response times in the low milliseconds. Their zero-crossing switching functionality reduces inrush currents and harmonic distortion, leading to improved power factor and energy efficiency. By eliminating mechanical contacts, these relays prevent arcing and wear, resulting in consistent performance and accurate temperature or motor control. This precision is critical in processes requiring tight tolerances, such as plastic molding, where any fluctuation can affect product quality. With our relays, you achieve repeatable, energy-saving control that enhances overall system efficiency and reduces operational costs.

Extensive Customization and Global Compliance

We understand that every application has unique requirements. Our solid state relay AC line includes a variety of control voltages (3-32VDC, 24-380VAC), load voltages (24-600VAC), and current ratings (10A-100A), all available in diverse packages (SIP, panel mount, and hybrid). We offer OEM/ODM services, allowing you to specify terminal types, input configurations, and even custom labeling. Our products comply with CE, CCC, and RoHS standards, ensuring international acceptance. With our professional engineering team, we can also provide customized solutions for special operations, such as high-frequency switching or extended temperature ranges, ensuring you get the exact relay for your application.

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The solid state relay AC is a critical component in modern industrial automation, offering a superior alternative to electromagnetic relays. In AC applications, solid state relays provide numerous benefits, including faster switching speeds, silent operation, and no mechanical wear. This results in improved system reliability and reduced maintenance. Suosite's solid state relay AC products are specifically engineered to meet the rigorous demands of industrial environments, providing high isolation, low power consumption, and excellent noise immunity. Our relays utilize advanced, international-grade SCRs and triacs, coupled with rigorous quality control processes, ensuring stable performance even in high-temperature or high-humidity conditions. Whether you are upgrading existing equipment or designing new systems, our solid state relay AC series offers the precision and durability needed to enhance operational efficiency and product quality.

Frequently Asked Questions

What is the typical lifespan of a solid state relay AC?

Solid state relays generally have a much longer lifespan compared to mechanical relays because they have no moving parts to wear out. Under normal operating conditions, our solid state relay AC products can last for millions of switching cycles or over 10 years of continuous use, depending on factors such as load current, ambient temperature, and switching frequency. Proper heat management is essential to maximize lifespan, so we recommend using appropriate heat sinks and following the derating curves provided in our datasheets.
Yes, solid state relays can switch inductive loads such as motors, transformers, and solenoids. However, when switching such loads, users must consider the inrush current and ensure the relay's rating exceeds the worst-case start-up current. Suosite's solid state relay AC models have inrush current withstand capabilities and built-in snubber circuits to handle voltage spikes. For motor applications, we advise selecting a relay with a current rating at least two times the motor's running current to safely accommodate the starting surge.
Zero-crossing relays switch on only when the AC voltage passes through zero, which minimizes electrical noise and inrush current. This is ideal for resistive loads like heaters. Random-on relays can be triggered at any point in the AC cycle, allowing for phase control and faster response, but they generate more electrical noise. Suosite offers both types, so you can choose based on your application's requirements. For precise temperature control, zero-crossing is often used, while random-on is suited for applications requiring immediate switching.
The current rating should be selected based on the maximum steady-state load current plus a safety margin. For resistive loads, choose a rating at least 1.1 times the load current. For inductive or inrush-heavy loads, we recommend a rating of 2 to 3 times the steady-state current. Also consider ambient temperature and cooling methods; higher temperatures require derating. Suosite's datasheets provide derating curves to help you select the right model. For example, if your load is 20A, a 25A relay may suffice for resistive loads, but a 40A or 50A is safer for motor loads.
No, solid state relays are designed specifically for either AC or DC loads. A solid state relay AC is designed to switch alternating current and may be damaged if used to switch DC loads due to difference in commutation. Our solid state relay AC products are optimized for AC voltage waveforms and provide reliable performance for AC loads. If you have DC load requirements, we offer separate DC solid state relay options that are suitable for those applications.

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Reviews

Rajesh Patel

We've been using Suosite's solid state relay AC in our injection molding machines for over two years. They handle the high inrush currents and the harsh environment without any issues. The zero-crossing switching has significantly reduced electrical noise in our plant. Their technical support team also helped us select the right model. Highly recommended!

Michael Schneider

Our plastic welding equipment requires precise control and frequent switching. The solid state relay AC from Suosite has been a game-changer. The switching is fast and silent, and we've experienced minimal downtime. The product quality is consistent, and the pricing is competitive. We appreciate their OEM customization service, too.

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Advanced Thermal Management

Advanced Thermal Management

Our solid state relay AC products incorporate advanced thermal management systems, including high-conductivity copper baseplates and optimized heat sink designs. This ensures efficient heat dissipation and stable performance even under high load conditions. Reliable heat management not only prevents overheating but also extends the operational life of the relay, reducing replacement frequency and maintenance costs. This is a key differentiator for Suosite, as we prioritize long-term reliability for continuous industrial operations.
Zero-Crossing Switching Technology

Zero-Crossing Switching Technology

With integrated zero-crossing detection, our solid state relay AC models switch on near zero voltage, minimizing inrush current and electromagnetic interference. This not only protects your load and extends its life but also reduces the stress on your electrical system. The result is cleaner operation, lower power consumption, and compliance with strict electromagnetic compatibility regulations. This feature makes our relays ideal for sensitive electronic equipment and precise temperature-controlled environments.
Comprehensive Safety and Compliance

Comprehensive Safety and Compliance

Every solid state relay AC we produce undergoes rigorous testing and complies with international safety standards, including CE and CCC. Our relays provide high isolation between control and load circuits, protecting low-voltage control components from power surges. With certifications and extensive testing, we ensure reliable and safe operation, giving you peace of mind. To further support our customers, we provide detailed technical documentation and application notes, ensuring proper installation and use.
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