Solid state relays (SSRs) are essential components for modern electrical control systems, offering silent operation, long lifespan, and faster switching speeds than mechanical relays. Choosing the correct SSR ensures reliable performance, prevents premature failure, and maintains the safety of your electrical circuits. This guide will help you navigate the key factors to consider when purchasing the best solid state relay for your needs.
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Discover now our comparison of the best Solid State Relays. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Solid State Relays are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Solid State Relays in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
No. 1
BlueStars Solid State Relay SSR-25DD DC to DC Input 3-32VDC to Output 5-200VDC 25A Single Phase Plastic Cover...
- π’π£π§ππ ππππ π£ππ₯ππ’π₯π ππ‘ππ: Each BlueStars SSR-25DD Solid State Relay comes with detailed instructions for optimal installation, ensuring faster temperature dissipation and extended lifespan.
- π£π₯ππππ¦π π¦π£ππππππππ§ππ’π‘π¦: BlueStars Solid State Relay SSR-25DD, DC 3-32V Input, DC 5-200V Output, 25A Current & Frequency: 50/60Hz. Total size (approximate): 58 x 45 x 32mm; Net weight: 168g...
- π©ππ₯π¦ππ§πππ ππ£π£πππππ§ππ’π‘: Experience a switch with no spark, no noise, high switching speed, anti-corrosion, moisture-proof, anti-vibration, long life, high reliability, and electromagnetic...
- π₯π’ππ¨π¦π§ & π₯πππππππ: Crafted with a heat-dissipating metal back plate and copper terminal lug for superior conductivity. BlueStars ensures longevity with a high-quality semiconductor optocoupler, spark-proof...
- πππππ§ππ π ππ¦π¦π¨π₯ππ‘ππ: Enjoy reliable performance and peace of mind with BlueStars lifetime protection, covering any defects or issues that may arise. Your satisfaction is our priority.
No. 2
3pcs Solid State Relay SSR-40DA Single Phase Solid State Relay Module Input 3-32V DC Output 24-380V AC for...
- γModelγSSR-40DA 40A 250V Solid State Relay Module, for PID thermostat temperature controller
- γSSR-40DA ParameterγSolid state module relay SSR-40DA, 3-32VDC/24-380VAC, control mode: DC to AC
- γRelay Sizeγ(L*W*H)62Γ45Γ24mm/2.48 x 1.73 x 0.94"
- γSSR ApplicationγNo electric spark, no noise, high switching speed, especially suitable for corrosion, moisture, dust resistant and other harsh environments. Widely used in many automatic control systems
- γPackage Includedγ3pcs SSR-40DA solid state relay module
No. 3
CG Solid State Relay SSR-25DA DC to AC Input 3-32VDC to Output 24-480VAC 25A Single Phase Plastic Coverβ¦
- β₯γWhat You GetγEach package With 2 mini bag of thermal grease which apply on the back of the SSR to make the temperature dissipate faster.
- β₯ Product Name: solid state module relay SSR-25DA, 3-32VDC/24-480VAC ; Current & Frequency:25A,50/60Hz.
- β₯ Total size (approximate):58 x 45 x 32mm/2.3" x 1.8" x 1.26" (l*w*t); Net weight:116g; Material:metal, plastic, electronic parts.
- β₯ SSR Application: with a switch no spark, no noise,high switching speed,anti-corrosion,moisture-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.
- β₯ Solid state relay ideal for automatic process control application, a must component for temperature controller and other machinery control system.
No. 4
CG Solid State Relay SSR-40DA DC to AC Input 3-32VDC to Output 24-480VAC 40A Single Phase Plastic Coverβ¦
- β₯γWhat You GetγEach package With 2 mini bag of thermal grease which apply on the back of the SSR to make the temperature dissipate faster.
- β₯ Product Name: solid state module relay SSR-40DA, 3-32VDC/24-480VAC ; Current & Frequency:40A,50/60Hz.
- β₯ Total size (approximate):58 x 45 x 32mm/2.3" x 1.8" x 1.26" (l*w*t); Net weight:116g; Material:metal, plastic, electronic parts.
- β₯ SSR Application: with a switch no spark, no noise,high switching speed,anti-corrosion,moisture-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.
- β₯ Solid state relay ideal for automatic process control application, a must component for temperature controller and other machinery control system.
No. 5
(10pcs)12V 5V 3v 3.3V Solid State Relay 1a,dc SSR,Input:3-32Vdc,Output:5-60Vdc,41Fdd,Non-Contact,Mini,Slim Ac...
- Input:3-32Vdc,Output:5-60Vdc
- Without a heatsink installed, the maximum current is 1A.
- Long lifespan: uses optocoupler isolation and is contactless, so there's no mechanical lifespan limit.
- Fast response,high trigger,no noise.
- Commonly used for development boards like ESP32 and Raspberry Pi.
No. 6
CG Solid State Relay SSR-25DD DC to DC Input 3-32VDC To Output 5-240VDC 25A Single Phase Plastic Cover
- β₯γWhat You GetγEach package With 2 mini bag of thermal grease which apply on the back of the SSR to make the temperature dissipate faster.
- β₯ Product Name: solid state module relay SSR-25DD, 3-32VDC/5-220VDC ; Current & Frequency:25A,50/60Hz.
- β₯ Total size (approximate):58 x 45 x 32mm/2.3" x 1.8" x 1.26" (l*w*t); Net weight:116g; Material:metal, plastic, electronic parts.
- β₯ SSR Application: with a switch no spark, no noise,high switching speed,anti-corrosion,moisture-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.
- β₯ Solid state relay ideal for automatic process control application, a must component for temperature controller and other machinery control system.
No. 7
Coliao 4pcs Solid State Relay SSR-25DA DC to AC Input 3-32VDC to Output 24-380VAC 25A 250V Solid State Relay...
- γModelγSSR-25DA 25A 250V Solid State Relay Module.
- γSSR-25DA Parameterγsolid state module relay SSR-25DA, 3-32VDC/24-380VAC ; Current & Frequency:25A,50/60Hz.
- γRelay Sizeγ(L*W*H)62Γ45Γ24mm/2.48 x 1.73 x 0.94".
- γSSR ApplicationγNo electric spark, no noise, high switching speed, especially suitable for corrosion, moisture, dust resistant and other harsh environments. Widely used in many automatic control systems.
- γPackage Includedγ4pcs SSR-25DA solid state relay module.
No. 8
HiLetgo 2pcs SSR-25DA 25A 250V Solid State Relay Module
- SSR-25DA 25A 250V Solid State Relay Alloy Heat Sink
- Model: SSR-25DA
- Input voltage: 3-32V DC
- Output voltage: 24-380V AC
- Control Method: DC to AC
No. 9
AITRIP 1PCS 8 Channel 5V Solid State Relay Module Board High Level Trigger Compatible with Arduino Uno...
- Solid State Relay Module Board has been assembled, and electrical test passed
- Led indicator for each relay
- Size: 155 x 55 x 24 mm (approximately 6.1 x 2.17 x 0.95 inch)
- Has been assembled, and electrical test passed. Led indicator for each relay. Size: 155 x 55 x 24 mm (approximately 6.1 x 2.17 x 0.95 inch) Input control signal voltage: 0V - 0.5V Low stage (SSR is OFF), 0.5V - 2.5V (unknown state), 2.5V - 20V High state...
- Load voltage range: 75 to 264VAC (50/60Hz); Load current: 0.1 to 2 AMP Standard interface that can be controlled directly by microcontroller (Compatible with Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
No. 10
CGELE Solid State Relay SSR-25DA with Heat Sink DC to AC Input 3-32VDC to Output 24-480VAC 25A Single Phase...
- β₯γWhat You GetγEach package With 2 mini bag of thermal grease which apply on the back of the SSR to make the temperature dissipate faster.
- β₯ Product Name: solid state module relay SSR-25DA, 3-32VDC/24-480VAC ; Current & Frequency:25A,50/60Hz.
- β₯ Total size (approximate):58 x 45 x 32mm/2.3" x 1.8" x 1.26" (l*w*t); Net weight:116g; Material:metal, plastic, electronic parts.
- β₯ SSR Application: with a switch no spark, no noise,high switching speed,anti-corrosion,moisture-proof,anti-vibration,long life.high reliability,electromagnetic compatibility and other characteristics.
- β₯ Solid state relay ideal for automatic process control application, a must component for temperature controller and other machinery control system.
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Last update on 2026-04-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Solid State Relays
Understanding SSR Types
- DC-DC Relays: Used for switching DC loads with a DC control signal. Common in battery-powered systems and DC motor control.
- AC-DC Relays: Control AC loads using a DC control signal. Widely used in automation, lighting control, and appliance switching.
- AC-AC Relays: Switch AC loads with an AC control signal. Suitable for industrial machinery, HVAC systems, and general AC power control.
Key Specifications to Consider
- Voltage Rating: The SSR must be rated to handle the maximum voltage of the load circuit. Ensure a safety margin, especially for inductive loads.
- Current Rating: Select an SSR with a continuous current rating exceeding the load's operating current by at least 25-50% to prevent overheating. Consider peak or inrush current for certain loads (e.g., motors).
- Control Voltage: Match the control voltage input range of the SSR to your control signal source (e.g., 3-32V DC, 90-280V AC).
- Switching Method: Zero-crossing (for resistive loads, minimizes RFI) or random/instantaneous turn-on (for inductive loads, prevents voltage spikes).
- Heat Dissipation: High-current SSRs often require heatsinks to operate effectively and prevent thermal shutdown. Check the SSR's thermal resistance and derating curves.
Mounting and Environmental Factors
- Consider the mounting method required (panel mount, DIN rail mount, PCB mount).
- Assess the operating environment. Look for SSRs with appropriate IP ratings if dust or moisture is a concern. Ensure the ambient temperature is within the SSR's specified operating range.
Frequently Asked Questions
What is the main advantage of a solid state relay over a mechanical relay?
Solid state relays offer several advantages, including silent operation, no moving parts leading to a longer lifespan, and faster switching speeds. They also generate less electrical noise (EMI/RFI) compared to mechanical contacts.
Do I need a heatsink for a solid state relay?
It depends on the current rating and ambient temperature. For higher current loads, the SSR will generate heat, and a heatsink is usually necessary to dissipate this heat and prevent overheating or failure. Always check the manufacturer's specifications and derating curves.
What does 'zero-crossing' mean for an AC SSR?
Zero-crossing switching means the relay turns on or off only when the AC voltage waveform crosses zero volts. This method is ideal for resistive loads like heaters and lights, as it minimizes electrical noise and interference.
How do I determine the correct current rating for an SSR?
You should select an SSR with a continuous current rating that is at least 25-50% higher than the maximum continuous current your load will draw. This provides a safety margin and prevents the relay from overheating during operation.
Can I use an AC-AC SSR to control a DC load?
No, you must use the correct type of SSR for your load. An AC-AC SSR is designed for AC loads, while a DC-DC SSR is for DC loads. Using the wrong type can damage the SSR and the load.
