Solid State Relay 50A | Zero-Crossing, CE-Certified SSR

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High-Performance Solid State Relay 50A for Industrial Automation

Discover the latest Solid State Relay 50A from Zhejiang Suosite Electrical Technology Co., Ltd., a national high-tech enterprise dedicated to excellence in industrial automation. Our 50A SSR is engineered for reliable switching in demanding applications such as temperature controllers, packaging machines, and industrial dryers. With over a decade of R&D expertise, we deliver a product that combines zero-crossing technology, robust thermal management, and compact design to ensure long service life and minimal electrical noise. Ideal for resistive loads, our relay supports AC loads up to 50 amps with input control options ranging from 3-32 VDC to 90-280 VAC. It comes with CE certification and is manufactured under strict quality control, ensuring consistent performance in ambient temperatures from -40°C to +80°C. Whether you are upgrading your existing system or designing a new one, our Solid State Relay 50A offers the reliability and efficiency you need.
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Case Study

Advanced Zero-Crossing Technology

Our Solid State Relay 50A utilizes zero-crossing switching to minimize inrush current and voltage spikes, reducing stress on connected equipment and prolonging system lifespan. This feature is critical in industrial environments where sensitive electronics are present. The zero-crossing circuit ensures the relay turns on only when the AC supply voltage crosses zero, resulting in lower EMI and improved electromagnetic compatibility. This leads to stable operation of temperature controllers and other precision instruments, preventing false triggers and data errors. Implemented with high-quality thyristors and robust snubber circuits, our SSR provides clean, reliable switching even with highly inductive or capacitive loads. For end-users, this translates to less downtime, lower maintenance costs, and enhanced safety. The technology has been rigorously tested to meet international standards, ensuring dependable performance in the harshest conditions. Choose our Zero-Crossing SSR to experie

Superior Thermal Design and Reliability

The Solid State Relay 50A features a purpose-built thermal management system that includes a copper base plate and a high-performance aluminum oxide ceramic substrate. This design ensures excellent heat dissipation, allowing the relay to handle continuous 50A loads without overheating. Under full load, the junction temperature remains well below the maximum rated limit, which significantly enhances the relay's lifespan. The internal construction is designed to withstand thermal cycling, making it suitable for applications with frequent on/off switching. We conduct rigorous 100% burn-in testing on every unit to guarantee reliability. The SSR is also equipped with built-in overcurrent and overvoltage protection, safeguarding your equipment from unexpected surges. This robust design has earned us the trust of customers worldwide who rely on our relays for critical operations. With a mean time between failures (MTBF) exceeding 100,000 hours, our Solid State Relay 50A offers peace of mind a

Versatile Input Control and Easy Integration

Understanding the diverse needs of our global customers, our Solid State Relay 50A supports a wide range of input control signals, including 3-32 VDC for direct logic connection to microcontrollers and PLCs, as well as 90-280 VAC for legacy systems. This versatility simplifies integration into existing automation setups, whether you are upgrading an old relay or designing a new control panel. The relay features an LED indicator that clearly shows the input status, making troubleshooting user-friendly. Its compact, panel-mounting design saves valuable space and adheres to international standard dimensions, ensuring ease of replacement. We provide a variety of terminal options, including screw and quick-connect types, to suit your installation preference. Additionally, our relay is compatible with both common AC loads like heaters and motors, and specialized equipment like semiconductor fabrication tools. With such flexibility, you can standardize your inventory and streamline maintenanc

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Solid state relays (SSRs) have revolutionized the way electrical loads are switched in industrial and commercial applications. Unlike electromechanical relays, SSRs have no moving parts, which eliminates mechanical wear and allows for millions of switching cycles without degradation. The solid state relay 50A from Suosite is particularly designed for heavy-duty applications where reliability and longevity are paramount. Its fully sealed construction protects against dust, moisture, and corrosive atmospheres, making it suitable for harsh environments such as chemical plants and outdoor installations. The use of thyristor technology ensures fast switching speeds (less than 1 ms turn-on and turn-off times), which is essential for precise temperature control in industrial processes. Moreover, the relay provides galvanic isolation between input and output, enhancing safety for operators. With the increasing demand for energy efficiency and automation, integrating a high-quality SSR into your system can significantly improve operational performance. Our solid state relay 50A boasts a low contact resistance (typically less than 10 mΩ), minimizing power losses and heat generation. It also features an integrated heat sink mounting surface, allowing you to easily attach an external heat sink for high-current applications. In addition to its technical merits, the relay is cost-effective, reducing the need for frequent replacements and maintenance. Invest in our Solid State Relay 50A to elevate your system's reliability and efficiency.

Frequently Asked Questions

What is the maximum load current and voltage for the Solid State Relay 50A?

Our Solid State Relay 50A is rated for a maximum load current of 50 amps RMS. It can handle AC voltages from 24 V to 480 V, covering standard industrial voltages such as 110 V, 220 V, and 380 V. The relay is designed for resistive loads; for inductive loads, we recommend derating to 40 amps or using a proper snubber circuit. The dielectric strength between input and output is 4000 Vrms, ensuring safe isolation. Always ensure proper heat sinking when operating at currents above 30 amps to maintain junction temperature within safe limits. For specific applications, our technical team can provide guidance on derating and thermal management.
Yes, the input control range is 3-32 VDC, so a 5V DC signal is suitable to drive the relay. The input impedance is typically 1.5 kΩ, requiring a current of around 4-20 mA. To ensure reliable triggering, we recommend using a minimum current of 10 mA. If your microcontroller output cannot supply sufficient current, you may need a driving transistor or a dedicated SSR driver. Also, the input is polarity sensitive for DC control, so observe correct wiring. The relay features an input indicator LED that lights up when the control signal is active, aiding in debugging.
For continuous operation at currents above 25 amps, we strongly recommend mounting the relay on an appropriate heat sink to dissipate heat effectively. The relay's thermal resistance (junction-to-case) is about 0.2°C/W. Without a heat sink, the internal temperature may rise excessively, leading to reduced lifespan or failure. For currents below 25 amps in a well-ventilated environment, a heat sink may not be necessary. Always consider the ambient temperature and load current when designing your system. Our product datasheet provides thermal derating curves to help you select the right heat sink. We offer optional heat sinks designed specifically for our SSR series; contact us for details.
The relay incorporates an internal varistor (MOV) and an RC snubber network across the output terminals. These components clamp voltage spikes and suppress high-frequency noise, protecting the relay and downstream equipment from damage. The MOV has a clamping voltage of approximately 1200V, which is suitable for IEC 61000-4-5 surge immunity. For installations in areas with frequent lightning strikes or harsh electrical environments, additional external protection may be beneficial. Our engineering team can recommend surge protection devices tailored to your specific requirements.
Solid state relays have a lifespan of over 100 million operations (mechanical relays typically last 100,000 to 1 million cycles). Our SSR is designed for continuous duty and can operate for many years without maintenance. The limiting factor is often the thermal cycling and operating temperature. By using proper heat sinking and staying within electrical specifications, the relay can last for decades in most applications. We provide a 3-year warranty, reflecting our confidence in the product's durability. Our testing shows an MTBF of 100,000 hours at 50°C ambient temperature.

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Reviews

James Anderson

We integrated the Solid State Relay 50A into our injection molding machines for precise temperature control of the barrels. After six months of continuous operation, not a single failure has occurred. The zero-crossing feature eliminated interference with our PLC systems, and the relay runs cool even at 45 amps. The build quality is top-notch, and the input compatibility with 24VDC simplifies wiring. Delivery was fast, and the technical documentation was thorough. Highly recommended for industrial applications.

Maria Santos

We switched from a competitor's SSR to the Suosite 50A model, and the difference was noticeable immediately. The switching is truly silent, and the response time is incredibly fast, which improved our packaging machine's cycle rate by 15%. The integrated protection features have saved us from costly downtime due to voltage spikes. Moreover, the price is very competitive, and the support from the sales team was outstanding. This is our go-to SSR for all new designs.

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Customizable OEM/ODM Services

Customizable OEM/ODM Services

Your Solid State Relay 50A can be tailored to your specific requirements. Suosite offers comprehensive OEM and ODM services, allowing you to customize electrical parameters, input control ranges, and even mechanical dimensions. We can incorporate your logo and branding on the product casing. Our engineering team collaborates with you to ensure the final product perfectly fits your application. This flexibility is ideal for equipment manufacturers who need a reliable SSR that aligns with their unique specs. We handle everything from design to production, ensuring high quality and consistency. With in-house tooling and testing facilities, we can deliver custom solutions quickly and cost-effectively.
Strict Quality Control and Certifications

Strict Quality Control and Certifications

Every Solid State Relay 50A undergoes rigorous quality checks, including 100% electrical testing and thermal performance verification. Our factory meets ISO 9001 standards, and our products are CE and RoHS certified. We also have UL and TUV certifications available upon request. Random batch tests are conducted to ensure long-term reliability. This commitment to quality ensures that you receive a dependable product that meets international standards, reducing your own compliance risks and enhancing your product's marketability.
Global Logistics and Prompt Delivery

Global Logistics and Prompt Delivery

We understand the importance of timely supply chains. With a monthly production capacity of hundreds of thousands of units, we maintain a significant inventory of our Standard Solid State Relay 50A, enabling 48-hour dispatch for urgent orders. Our logistics partners offer various shipping options, including air, sea, and express delivery, to destinations worldwide. We also offer dropshipping services for distributors. Regardless of order size, from samples to bulk, we ensure your orders arrive on time, helping you maintain seamless operations and meet your own delivery commitments.
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