Solid State Relays
- The best solid state relay suppliers in China
- Low MOQ required
- Up to 200 products to choose from
- Two-year long warranty
Our product categories
Our products
Click the 3 buttons below to view our Single Phase Solid State Relays, Three Phase Solid State Relays and Solid State Voltage Regulators products respectively.
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Ultra small, DC/DC and DC/AC available, Made in China, Good...
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Dual input and dual output, DC control AC type, Load...
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DIN rail mounting, compliant with IEC60715, Radiator pre-installed, Current range...
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Load current: 100A, Control Voltage: 3-32VDC, Load Voltage: 5-220VDC, Clear...
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Specifically designed for single-phase DC heaters, Maximum load current: 60A,...
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Specifically designed for single-phase DC loads, Load current: 25A, Control...
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Single phase DC control DC solid state relay, Maximum load...
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Specifically designed for single-phase DC loads, Load current: 40A, Control...
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Suitable for single-phase AC loads, Control voltage: 70-280VAC, load voltage:...
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Suitable for single-phase AC loads, Control voltage: 70-280VAC, load voltage:...
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Built-in RC absorption circuit, With LED running status indicator light,...
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Built-in RC absorption circuit, With LED running status indicator light,...
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Single phase DC to AC solid state relay, Control voltage...
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For single phase load, Specially designed for heating application, DC...
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Compact and easy to use, DC controlled AC solid state...
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Reliable product quality, Single phase DC controlled AC solid state...
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RC snubber circuit inbuilt, reducing noise, Maximum 100 amps load...
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Type: AC to AC SSR,C Control voltage: 70-280VAC, load voltage:...
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Type: AC to AC SSR, Control voltage: 70-280VAC, load voltage:...
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Three-phase DC controlled AC solid state relay, Control voltage DC3-32V,...
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RC snubber circuit inbuilt, reducing noise, Plastic cover ensure safer...
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Manual control solid state voltage regulator Maximum load current 10...
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Manual control solid state voltage regulator Maximum load current 25...
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Analog 4-20mA control Output voltage 0-380VAC adjustable, 2 years warranty,...
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Analog 4-20mA or 0-10VDC control, Maximum load current up to...
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Single phase potentiometer control SSVR, Maximum load current 40A, Specially...
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Why choose us to be your supplier?
china supplier
Our factory is located in the low-voltage electrical appliances hub in China. Our products deliver superior quality and competitive pricing.
Wide products range
Lorentzzi can supply a full range of good quality solid state relays, the solid state relays load current is from as small as 10 ampere to maximum 120 amperes.
Fast delivery
We always keep SSRs stock at a reasonable level to meet customers' urgent orders. We believe that helping customers save time also helps them save money.
Solid state relay applications
Lighting Control
In the lighting control application, the SSR is used as a switch, a stage always needs a silent environment, so the SSR no noise functions just meet this requirement.
Heating control
The heating elements are always controlled by a temperature controller, if the temperature controller output is SSR, a SSR will be this execution unit.
Kiln Temperature Control
Kiln systems always need fast and precise temperature control, a solid state relay just has this advantage, so we can often see SSRs in a kiln system.
Automated Industry
In the automation industry, we always use PLC to control various parts, and a SSR is the best execution unit to operate various parts.
Transformer Control
Turning on a transformer control needs a very big current, it is very dangerous. By using a DC AC SSR, we can avoid this danger.
Motor Control
We can easily find a SSR in a motor control system, therefore, a suitable SSR is very vital, please contact us for a perfect instruction.
Frequently asked questions
Want to safely control a heavy load with a small signal? As a professional, your first thought may be to use an electromagnetic relay or an AC contactor. Both products can perfectly solve this problem. But is there a third option? Yes, maybe we can also consider using a solid-state relay. So, what is it? How does it work? Next, we will provide you with a comprehensive explanation.
What is a solid state relay?
A solid-state relay is essentially a switch, but it has no moving parts and no contacts, and uses a semiconductor such as a triac or MOSFET to control the load.
How do SSRs differ from traditional power relays or AC contactors?
AC contactors are actually a traditional power relay, but they can usually handle much higher currents than small traditional electromagnetic intermediate relays. Small power relays can handle currents of no more than 120A, while AC contactors can handle currents of up to 1050A.
Solid-state relays (SSRs) are completely different from traditional relays. You can read our two articles to learn more about the differences between the two products. First article: SSR Vs. AC Contactor: Which Is Better In A Temperature Control System? Second article: SSR Vs Relay: Which One Is Better?
The working principle of SSR
A complete SSR contains 3 main parts, they are input circuit, optocoupler, output circuit, its working process is below:
- Signal Reception: The SSR receives a control signal at its input terminal.
- Optical Coupling: The control signal activates the LED in the optocoupler, which emits light.
- Signal Transfer: The light is detected by the photosensitive semiconductor in the optocoupler, transferring the control signal to the output circuit.
- Switching Action: The photosensitive semiconductor triggers the semiconductor switching device (e.g., triac or MOSFET), which turns on and allows current to flow to the load.
- Load Activation: The load is activated as current flows through it.
- Signal Removal: When the control signal is removed, the LED turns off, the photosensitive semiconductor resets, and the semiconductor switching device turns off, stopping current flow to the load.
Lorentzzi® brand solid-state relays use Onsemi brand high-quality optocouplers as isolation elements, and the load circuit part has an RC resistance-capacitance absorption circuit, which can effectively reduce the impact of transient overvoltage and peak current on solid-state relays.
Types of SSRs
In our LorentzziⓇ mindset, solid state relays can be simply divided into three types: single-phase solid state relays, three-phase solid state relays, and solid state voltage regulators.
We can also classify solid state relays (SSRs) in other ways, and you can learn more about SSR categories in this article: Solid State Relay Types: How to Choose the Right SSR for Your Application.
Advantages of using SSRs
As mentioned before, since solid-state relays use semiconductor switch loads, they have 5 advantages: long lifetime, high reliability, low noise, fast switching, high and low voltage isolation, and safer use.
SSR applications
The solid state relay is mainly used to control heating equipment such as food processing machinery, plastic injection molding/extrusion, furnaces, HVAC, infrared heating for residential heating, dryers, thermoforming and welding equipment.
Also we can find it in other devices, such as lighting control, motor control and so on, you can refer to our article for more information: Solid State Relay Applications: A Comprehensive Guide.
How to test a SSR?
Overheating, over-voltage and over-current are the three main reasons that lead to permanent damage to SSRs. So how do we detect whether a solid-state relay is damaged and how to prevent it? You can read our following articles to check and prevent it:
Article 1: How To Test A Solid State Relay?
Article 2: Solid State Relay Problems and Solutions: The Ultimate Guide.
Solid state relays wiring diagram
Wiring a solid state relay is not complicated, but there are some things to note. Our article “How to wire a solid state relay?” provides you with a complete guide to wiring a solid state relay.
