Solid State Relays

Solid state relays, rating from 10A to 100A. We are one of the biggest manufacturer of SSR relay in China. With over 15 years of experience, ATO knows what it takes to manufacture solid state relays that are designed to withstand the rigors of your toughest applications. Get an instant price from relay wholesale supplier today, drop shipping is available for online resellers, lead time is as fast as 1 day.

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Catalogue (PDF) | Technical Video | Price List

15+
Years in Relay Manufacturing

4,000+
Square Feet Factory Size

6,000+
Relays Produced Each Month

Solid State Relays

Solid state relays, as known as SSRs, are typically used to control large current loads with a small input control signal. SSR relay is a kind of contactless switch composed of microelectronic circuit, discrete electronic device and electronic power device, which realizes the isolation between control end and load end.

ATO is a Chinese market pioneer in solid state relay technology with one of the broadest range of products in the industry. ATO manufactures single phase and 3 phase solid state relays with wholesale price, including DC-AC and AC-AC, with load currents from 10A to 120A. In addition, compact industrial solid-state relay ATO supplied provides DC control AC with load current ranges of 60 amp, 80 amp, and 350 amp. They have been widely used with the advantages of high reliability, no contact, long life, fast speed, small anti-interference and so on.

Single Phase AC-AC SSR Relay

ATO AC-AC SSR has different current of 10A ~ 120A for your choice, facory direct sales with wholesale price.

Single Phase DC-AC SSR Relay

Single phase solid state relay is a non-contact switch composed of microelectronic circuits. Voltage type is DC to AC.

3 Phase AC-AC SSR Relay

ATO supplies AC to AC 3 phase SSR for your applications, with 3-32V DC input and 24-480V AC output, panel mount.

3 Phase DC-AC SSR Relay

DC to AC 3 phase SSR relay is a non-contact switch composed of microelectronic circuits, discrete electronic devices, and power electronic power devices.

Industrial SSR Relay

Single phase industrial solid state relay provided by ATO, 60, 100, …, 350A load current with 3-32VDC control 24-440VAC, high switching speed and no noise.

SSR Heat Sink

SSR heat sink is designed for single phase SSR and 3 phase solid state relay, suitable for single phase solid state relay or one piece of three phase solid state relay.

DIN Rail Mount SSR Relay

All-in-one SSR solid state relays with heat sink and DIN rail mounting are of high strength, impact resistance and strong vibration resistance, with low requirement for input current.

Focus Values

As the Chinese relay manufacturer, we are constantly innovating and introducing many new relay products in recent years, such as solid state relay, signal relay, timer relay, electromagnetic relay, etc. But our main product, the SSR, accounts for 60% of our annual sales. We aspire to be a solution specialist in the field of relay.

We attaches great importance to technology research and development, and has experienced technicians and professional management teams in SSR solid state relay research and technology innovation.

Our Factory

Quality, precision, innovative spirit. Cornerstones of the impressive success story, from a small firm in China to a corporate group operating at the global level.

Our factory can supply the new product developed and OEM service. Our relay have been exported to over 80 countries and region all over the world. ATO electrical relays enjoy high reputation among the customers because of high quality and wholesale price.

Our Certification

The CE certification for solid state relays is a crucial approval mark indicating compliance with European Union safety and quality standards. To obtain CE certification for an SSR, solid state relay manufacturer must demonstrate that the product adheres to these standards through rigorous testing and documentation. Our AC and DC solid state relays all meet this standard.

This process involves evaluating factors such as insulation, thermal performance, and electromagnetic interference, ensuring the SSR relay doesn't pose a risk to users or other connected equipment.

SSR Relay Overview

A solid state relay or SSR for short is an electrical switch that can be used to operate a higher voltage circuit using a low voltage circuit. The SSR relay has four terminals, two of which are input control terminals, and the other two terminals are output control terminals. They consist mainly of three parts: Input Circuit (Control Circuit), Drive Circuit, and Output Circuit (Controlled Circuit).

ATO electronic relays, whether it's a single phase or a 3 phase solid state relay are also featured with a red LED input status indicator, high structural strength, high resistance to shock, CE-listed and come with a built-in over voltage protection. We also have models that integrate a built-in heat radiator to provide more convenient and streamlined assembly units.

Get Your Right Relay

SSR Relay Material

Transparent housing

The installation of a clear plastic cover protects the internal parts of the SSR relay from external impacts.

LED light

The use of led is convenient to grasp the switching status of the relay, moderate brightness, good quality and durability.

Copper port output

The SSR relay port uses copper for output, which has excellent oxidation resistance and conductivity.

Solid State Relay FAQ

Does solid state relay output AC or DC?

SSR relay is electronic switches that use semiconductor devices like thyristors to control the flow of electrical current. The output of an SSR can be either AC or DC, depending on the specific model and application requirements. SSRs are versatile and can be designed for various load types, making them suitable for both AC and DC applications. They are commonly used to switch AC loads like lights, heaters, and motors or DC loads such as LEDs and electronic circuits. The output type is determined by the input signal and the SSR's internal design, making them adaptable to a wide range of applications.

How long will a solid state relay last?

The lifespan of a SSR solid state relay largely depends on factors like operating conditions, load type, and quality of components. Generally, high-quality SSRs can last between 100,000 to 10 million cycles, which translates to several years of operation in typical applications. SSRs have no mechanical parts, reducing wear and tear, making them more durable than electromechanical relays. However, excessive heat, overvoltage, or current spikes can reduce their lifespan. Proper sizing, adequate cooling, and protection measures can extend the SSR's life. It's essential to consult the manufacturer's specifications and consider the specific application for a more accurate estimate of an SSR's longevity.

How does solid state relay work?

A solid state relay (SSR) is an electronic switching device that uses semiconductor components, typically an optocoupler and a triac or thyristor, to control the flow of electrical current without mechanical contacts. When an input voltage is applied to the optocoupler's LED, it emits light, which triggers a photo-sensitive component. This, in turn, allows current to flow through the output circuit, activating or deactivating the load connected to the SSR. SSRs offer advantages over traditional mechanical relays, such as faster switching, longer lifespan, and reduced electromagnetic interference, making them ideal for applications that require precise and reliable electrical control.

How do you cool a solid state relay?

Cooling a solid-state relay (SSR) is crucial to ensure its proper operation and longevity. To cool an SSR, consider the following methods:
1. Heat Sink. Attach a heat sink to the SSR, which helps dissipate heat generated during operation. Choose a heat sink with adequate thermal resistance to maintain safe operating temperatures.
2. Airflow. Use fans or natural convection to improve airflow around the SSR and heat sink, enhancing heat dissipation.
3. Ambient Temperature Control. Maintain a controlled operating environment with a stable ambient temperature to prevent overheating.
4. Load Management. Properly match the SSR's current and voltage ratings to the load to reduce excessive heat generation.

Can a solid state relay burn out?

Yes, solid state relay can burn out due to various factors. Overcurrent, voltage spikes, and excessive heat are common causes. When the current through an SSR exceeds its rated load capacity or if it encounters a voltage surge, it can lead to internal component failure, resulting in burnout. Additionally, if the SSR's internal heat dissipation is insufficient for the load, it can overheat and eventually fail. Proper selection, heat sinking, and protection measures can help prevent SSR burnout, ensuring their reliable operation in control and switching applications.

More from ATO Relays …

Signal Relays

A signal relay is an electromagnetic switch that controls the flow of electrical signals in electronic circuits. It allows a low-power input signal to control a higher-power output signal, enabling the isolation and amplification of electrical signals.

Timer Relays

A timer relay is an electrical device that combines the functions of a relay and a timer. It can be used to control the timing of electrical circuits by allowing or interrupting the flow of current after a predetermined time period.

Electromagnetic Relays

An electromagnetic relay is an electrical switch that uses an electromagnet to control the flow of current in a circuit. When the electromagnet is energized, it mechanically closes or opens the switch, allowing or interrupting the electrical flow.