2025 Guide to Selection Single-Phase Solid State Relay

In the dynamic landscape of electrical control, solid state relays (SSRs), also known as solid state contactor relays, play a pivotal role. Let’s start with a real-world scenario. In a small-scale automated factory, a wrong choice of a single-phase solid state relay led to frequent equipment malfunctions, disrupting production and causing significant financial losses. This example vividly showcases the criticality of the Selection of Single-Phase Solid State Relay, which is the focus of this guide.

The Significance of Selection of Single-Phase Solid State Relay

Benefits of Making the Right Choice

Opting for the appropriate single – phase solid state relay is the key to ensuring stable equipment operation. It can significantly reduce equipment failure rates. For instance, in the realm of smart homes, a correctly chosen SSR can control various electrical appliances precisely. This minimizes the wear – and – tear on motors and other components, thus extending the lifespan of these devices.

In small automated production lines, the right SSR can enhance production efficiency. By enabling smooth and accurate switching of power, it reduces downtime and boosts overall productivity. This, in turn, cuts down maintenance costs and improves product quality. A well – selected SSR can prevent premature failures of equipment, saving businesses the hassle and expense of frequent repairs and replacements.

Risks of Making the Wrong Choice

Making an incorrect choice of single – phase solid state relay can have dire consequences. Equipment damage is a common outcome. For example, an SSR with insufficient current – handling capacity may overheat and burn out when used with a high – power load. Short – circuits can also occur, which not only damage the relay itself but may also cause harm to other connected devices.

In terms of performance, the control accuracy may decrease, and the response speed can slow down. This is particularly problematic in applications that require rapid and precise control, such as in high – speed manufacturing equipment. There are also serious safety hazards. Faulty SSRs can pose a risk of electric shock to operators and may even trigger fires, especially in environments with flammable materials.

In a real-life case, a manufacturing company suffered a major fire due to a malfunctioning SSR, leading to significant property damage and production disruptions. This demonstrates how a wrong selection can negatively impact both business operations and user experiences.

How to Select the Right Single-Phase Solid State Relay

Defining Your Actual Requirements

Load types vary, and understanding them is crucial for the Selection of Single – Phase Solid State Relay. Resistive loads, such as electric heaters, have a relatively stable current draw. Inductive loads, like motors, generate back – EMF (electromotive force) during startup and shutdown, which can stress the SSR. Capacitive loads, on the other hand, can cause inrush currents.

To choose a suitable SSR, you need to identify your load type. A simple way to determine this is by checking the equipment’s specifications. If it’s a motor, it’s an inductive load; if it’s a heating element, it’s likely a resistive load. Once you’ve determined the load type, you can select an SSR with the appropriate characteristics to handle the specific load demands.

Thoroughly Studying Product Parameters

Product parameters are the cornerstone of making an informed decision in the Selection of Single – Phase Solid State Relay. The rated current indicates the maximum continuous current the SSR can handle safely. For example, if your load requires a continuous current of 10A, you should choose an SSR with a rated current higher than 10A, say 15A or 20A, to ensure reliable operation.

The rated voltage determines the voltage range within which the SSR can operate properly. Using an SSR outside this range can lead to performance issues or even damage. Peak current is crucial for devices with frequent startup and shutdown cycles. For a motor that experiences high inrush currents during startup, an SSR with a high peak-current rating, such as 160A for some models, can withstand these surges without failure.

Response time is important for applications that require quick switching, such as in high – speed data transfer systems. Insulation resistance ensures electrical safety by preventing leakage currents. To determine the right parameter range, consider your equipment’s power requirements, operating conditions, and the frequency of operation.

Evaluating Brands and Suppliers

When it comes to the Selection of Single – Phase Solid State Relay, brands and suppliers matter. Renowned brands often have strong technical capabilities, ensuring high – quality products. They also offer excellent after – sales services, such as technical support and product warranties.

To evaluate a supplier, you can start by checking customer reviews. Positive reviews indicate good product performance and customer satisfaction. Understanding the production process and quality control systems of the supplier can also give you an idea of the product’s reliability. Comparing the prices and quality of products from different suppliers can help you find a cost – effective option within your budget. A reliable supplier can provide you with consistent product quality and timely support, which is essential for the smooth operation of your equipment.

Performance Analysis of Bedook Single-Phase Solid State Relays

BEDOOK SSR-A Series

The SSR-A series from Bedook offers a range of rated currents, such as 10A, 25A, etc., and a load voltage range of 24 – 380VAC. This wide voltage range makes it suitable for a variety of common electrical loads. For resistive loads like small – scale heating appliances, its relatively low output ON voltage drop of less than 1.6V (R.M.S) ensures efficient power transfer.

In terms of performance, its control accuracy benefits from a fast response time of 1/2 Cycle + 1ms max. (or ≤1ms for “R” type). This allows for precise regulation of the power supply to the load, ensuring consistent operation. The high insulation resistance of 500VDC, 100M (between input/output and housing) provides reliable electrical isolation, enhancing stability and safety.

BEDOOK SSR-D Series

The SS -D series is designed for DC load control. With a rated voltage of 5 – 24VDC, it is well – suited for low – voltage DC applications. Its low conduction voltage drop, similar to the AC – type SSRs in the Bedook range, reduces power losses during operation.

The high switching frequency and a response time of 1/2 Cycle + 1ms max. (or ≤1ms for “R” type) make it ideal for applications that require rapid on-off switching of DC power. For DC motors and solenoids, which often need quick response times, the SSR-D series can handle the high peak currents (e.g., 160A for the 10A-rated model) during startup and operation, providing smooth and reliable control.

BEDOOK SSR-DD Series

The SSR-DD series features a random control mode, which is a unique selling point. This mode allows for more flexible control compared to traditional relays. It has a rated current ranging from 5A max to 70A max, and a surge-withstanding current of up to 225A max for the 70A-rated model.

This series is particularly suitable for equipment that demands extremely high control response speeds, such as certain high – speed industrial automation equipment. The relatively fast response time of 1.0ms enables it to react quickly to control signals, adapting to the specific requirements of different loads.

BEDOOK SSR-LA Series

The SSR-LA series from Bedook uses the phase-control mode. It has a rated current of 10A max, 25A max, or 40A max, and a surge-withstanding voltage of 1200VAC min. This high surge-withstanding voltage is beneficial for applications where power quality is a concern.

The phase-control mode enables precise voltage regulation, reducing harmonic interference. When used with a PLC, the 4 – 20mA input feature allows for accurate control signals. The low leakage current (Max 0.5% of full load) ensures stable operation and minimal interference with the load.

BEDOOK SSR-VA Series

The SSR-VA series combines variable resistor input and phase – control features. It has a rated current of 10A max, 25A max, or 40A max, and an output voltage range of 24 – 380VAC. The variable resistor input provides flexibility in control.

In applications like dimming systems for lighting or speed control systems for motors, the SSR – VA series can adjust the power output precisely. The phase – control mode, combined with its input resistance of 250K /110VAC; 500K /220VAC; 1M and VR power of 1/4W min, allows for smooth and efficient control.

Conclusion

In conclusion, the Selection of Single – Phase Solid solid-state relay is a complex but essential process. By understanding your requirements, carefully studying product parameters, and evaluating brands and suppliers, you can make an informed decision. Bedook’s single-phase solid state relays, with their diverse features and excellent performance in different series, offer reliable solutions for various applications. Whether you need to control a simple resistive load or manage a complex industrial process, Bedook has a suitable SSR for you. Choose Bedook for high-quality, efficient, and reliable single-phase solid state relays.

Extended reading:

What Is a Solid State Relay (SSR)? A Definitive Guide for Engineers

Solid State Relay SSR Classification: A Must – Know for Electrical Projects

How Bedook Stands Out as a Trusted Solid State Relay Manufacturer