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Solid State Relay

What is a solid state relay?

A solid state relay (SSR) is a type of electronic switch used to control electrical circuits. SSRs are often used in industrial applications as they have high efficiency, higher reliability and lower power consumption than other types of switches, such as thyristors or semiconductor devices.

Solid state relays are made of assembly-line technology and have very low power consumption and require minimal maintenance.

They are designed to handle continuous duty cycles and are perfect for applications where high-speed switching is required like motor start/stop controls or lighting control systems.

Application Examples for Solid-State Relays (SSRs)

Motor Control: Use an SSR to switch AC or DC motors with a microcontroller or PLC. Ideal for starting, stopping, or reversing industrial or robotic motors.
Heaters & Thermal Loads: Control electric heaters, heat elements, hot-plates or ovens with SSRs. Because SSRs have no mechanical contacts, they’re great for frequent switching and solid reliability.
Lighting & AC Loads: Use SSRs to switch 110 V or 240 V lighting circuits, LED arrays, or mains devices with low-voltage control signals for smart automation.

Voltage Range Chart

Specification	Typical Range	Notes
Control / Input Voltage	3 VDC – 32 VDC (common)	Signal side — what triggers the SSR. :contentReference[oaicite:0]{index=0}
Load / Output Voltage (AC Type)	24 V – 280 V AC (some up to 660 V) :contentReference[oaicite:1]{index=1}	For switching AC mains loads. Always check datasheet.
Load / Output Voltage (DC Type)	0 V – 100 V DC (or more in high-power models) :contentReference[oaicite:2]{index=2}	Used for DC motors, LEDs, battery systems.

Wiring Diagrams for Quick Setup

Solid-state relay wiring diagrams for AC loads, DC loads, and microcontroller control connections.

AC Load Switching Diagram

   Control Signal (3-32 VDC) → SSR input terminals
   SSR output terminals in series with AC supply and load:
     L (Live) → SSR terminal 1 
     SSR terminal 2 → Load (heater / lamp / motor)
     Neutral → Load → back to AC supply

This wiring is typically used for 110 V or 240 V AC loads. Ensure proper isolation and fuse protection.

DC Load Switching Diagram

   Control Signal (DC) → SSR input
   SSR output terminals inserted between DC supply positive and load:
     +Supply → SSR terminal 1
     SSR terminal 2 → Load positive
     Load negative → Supply negative

Used for battery-powered systems, DC motors, or LED drives. SSR must support DC output type.

Microcontroller Control Example

   MCU GPIO (e.g., Arduino D5) → through resistor → SSR input +
   SSR input – → MCU GND 
   
   External power supply → SSR output terminals in series with the load.

Best Price for Solid State Relays Online in India

Looking for the best price on solid state relays (SSRs) online in India? Robocraze stocks a reliable range of SSRs suited for industrial automation, DIY electronics, and embedded control applications — with competitive pricing and fast delivery across the country. Prices vary based on load voltage, current rating, and relay type — AC, DC, or AC/DC switching. Buying from a trusted supplier like Robocraze means transparent pricing, genuine stock, and the right component for your application without the guesswork.

Are Solid State Relays from Robocraze Original and Genuine?

Yes. Every solid state relay sold through Robocraze is a genuine, quality-assured component sourced from reputable manufacturers. Authentic SSRs deliver accurate ratings, reliable switching performance, and consistent long-term service life — all of which matter in applications where failure isn't an option. Counterfeit or poorly manufactured SSRs are a known problem in the components market; they overheat, switch unreliably, and can cause serious damage to connected equipment. Robocraze eliminates that risk by stocking only verified, quality-checked parts.

Solid State Relay Specifications — What to Compare

Solid state relays differ across several key parameters that determine suitability for your application. Start with load type — AC, DC, or AC/DC — then confirm the rated load current (commonly 10A, 25A, or 40A) and control voltage range (typically 3–32V DC for microcontroller-compatible models). Isolation method, trigger type (zero-cross for reduced EMI or random-fire for phase-sensitive control), and response time all affect performance in switching applications. Finally, consider mounting style — PCB mount for compact builds or panel mount for industrial enclosures — and whether your setup requires an external heatsink for thermal management at higher current ratings.

Solid State Relay Price On Robocraze:

Item Name	SSR Relay Price Inc. GST( As of 30th Sep 2022)
6V Relay Cube	14
9V Relay Cube	45
JQX-15F(T90) Coil Voltage DC 24V 6 Pin Power Relay	54
24V Relay Cube (Pack of 2)	53
12V 30A T90 Relay	47
5 Pin 48V DC Coil Voltage Electromagnetic Power Relay	79
5V 1 Channel SSR Module	146
5V 8 Channel SSR Module	958
5V 2 Channel SSR Module	378
FOTEK Solid State Relay SSR-25DA 25A	317
4 Channel Solid State Relay	552
FOTEK 24V-380V 40Amp DA Solid State Relay Module	408

Popular Searches

1. Where can I find a solid-state relay online?

Solid state relays can be obtained in online stores such as Robocraze.

2. Where can I find a solid-state relay nearby at a physical store?

Solid State relays are found in many electronic stores at your local city market. Since the availability of the solid state relays are not guaranteed at such local shops, it is recommended to confirm availability before visiting the store.

3. What is the price of a solid-state relay?

Solid state relays vary from a few hundred rupees to sometimes much higher depending on the size, rating, voltage load, current load, safety features etc.

4. How to wire a solid-state relay?

A solid state relay has four terminals, two to control the relay and the other two to open and close connections in between depending on the input terminal voltage. The input terminals must be connected to the the VCC and GND of the controlling device (ie microcontroller or sensor) while the other two terminals act like two ends of a switch, establishing connection when the input voltage goes above threshold and disconnection when the input voltage goes below threshold

5. How to use a solid-state relay?

When the input voltage goes above the designed threshold, the relay establishes connection between the two output terminals and disconnects the terminals when the input voltage goes below the threshold voltage.

6. How to test a solid-state relay?

You can test the solid state relay using continuity mode on the multimeter. Place the multimeter probes across the two output terminals and turn it on in continuity mode. If the input voltage goes above threshold, the multimeter should emit a sound indicating that the circuit is complete, and it should not emit a sound when the input voltage is below threshold

7. How much current does a solid-state relay draw?

This varies between different models of solid state relay. Typically a Solid state relay will consume far less current than an electromechanical relay - about 10-20 mA. But current consumption of different solid state relays depends on exact models so refer to the particulate relay datasheet for accurate numbers.

8. What is the difference between a relay and a solid-state relay?

A relay generally refers to an electromechanical mechanism, where there is a physical movement of components inside the relay due to the supplied controlling current, causing the switch to close. A solid state relay has no moving parts and is controlled by transistors in switch mode and optocouplers for circuit isolation

9. Do solid-state relays click?

No. Since Solid state relays have no moving parts, it does not have any clicking sound and is also much faster than typical relays used.

10.Why is a solid-state relay better than a switch?

Solid state relay offers the same advantages of having a relay in place instead of switch. While a switch will always be dependent on an external human operator, relays can be controlled electronically thereby giving the user much more flexibility in its implementation.

11. How long do solid-state relays last?

Solid state relays are very reliable devices and will almost always outlast an electromechanical based relay due to the fact that it doesn’t have any moving parts. While a typical EMR lasts about one million cycles, a SSR is designed to last at least 100 times that. The most likely way a SSR gets damaged is if the supplied voltage is greater than the specified in the datasheet.

12. How Solid State Relay Works?

The working principle of a solid state relay can be explained as follows.
When a voltage is applied to the input of a solid state relay, the relay is triggered by an optocoupler or an electronic device such as a diode, LED, resistor, or transistor. In the output circuit an electrical signal is sent to the trigger circuit. The switching element of the output circuit is turned on. When the switching element turns on, the load current flows and the device connected to the output can be controlled. Removing the input voltage disables the control circuit and turns off the solid state switch.

13. What is a solid-state relay used for?

A solid-state relay (SSR) is an electronic switch used to control high-power AC or DC circuits with a small, low-voltage signal. They are perfect for switching AC loads like motors, heaters, and industrial lighting without any moving parts. This results in faster switching, a much longer lifespan, and silent operation, making them ideal for robotics and automation projects where reliability and precision are key.

14. How is SSR different from an electromagnetic relay?

The key difference is in their construction. A solid-state relay (SSR) is purely electronic, using semiconductors to switch power without any moving parts. In contrast, an electromagnetic relay is a mechanical device using a coil to physically close contacts. This makes SSRs faster, quieter, and significantly more durable, as there is no physical wear and tear or the electrical arcing common in mechanical relays.

15. Can SSRs handle high-voltage loads?

Yes, SSRs are specifically designed to manage high-voltage loads. Many models easily switch standard AC line voltages like 120V and 240V, while industrial-grade versions can handle 600V AC or more. It is crucial to select an SSR with a voltage and current rating that comfortably exceeds your load's requirements to ensure safe, reliable operation, often requiring a heat sink for high-current applications.

16. Are these suitable for Arduino or Raspberry Pi control?

Absolutely. Solid-state relays are an ideal choice for projects using an Arduino, Raspberry Pi, or other microcontrollers. Their low-voltage DC control inputs (typically in the 3-32V DC range) are perfectly compatible with the digital output from GPIO pins. This allows your low-power board to safely switch high-voltage AC devices like lamps, fans, and pumps, making them essential for home automation and robotics.

17. How do I select the correct SSR rating?

To select the correct SSR rating, you must identify your load's operating voltage and maximum current draw (amperage). Always choose an SSR with ratings well above your load's requirements to create a safety margin—typically 25% to 50% higher. For example, for a 10A load, select at least a 15A SSR. Also, consider if your load is inductive (like a motor), which requires a higher rating.

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