Solid State Relays (SSR) – Silent, Reliable & Long-Life Industrial Switching

Discover high-quality Solid State Relays (SSRs) designed for silent, reliable, and long-life switching in industrial and electronic applications.
With fully electronic operation and no mechanical contacts, SSRs provide fast, precise, and noise-free switching performance.

Our SSRs support DC-AC, AC-AC, and DC-DC configurations, available in single-phase and three-phase models.
They are widely used for controlling heaters, lighting, power supplies, motors, and industrial automation systems, offering high electrical isolation and excellent durability.
OEM/ODM customization is available for industrial projects and bulk procurement.

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Why Choose Our Solid State Relays (SSR)

• No Sparks, No Noise –
  Fully electronic switching eliminates arcing and audible noise.
• Long Service Life –
  Zero mechanical wear makes SSRs ideal for frequent and continuous switching.
• Fast & Accurate Control –
  Stable and precise switching performance for heaters, motors, and automation systems.
• High Electrical Isolation –
  Safe separation between control signal and load circuit.
• Industrial-Grade Durability –
  Resistant to shock, vibration, humidity, and harsh industrial environments.
• Wide Product Selection –
  DC-AC, AC-AC, DC-DC types; single-phase and three-phase SSRs available.
• OEM & ODM Customization –
  Custom current ratings, terminals, casing, wiring layout, and labels.
• Certified Quality –
  CE / CCC certified, 100% tested before shipment.

Applications

Solid State Relays are widely used in applications requiring silent, reliable, and fast switching.

• Industrial Heating Systems –
  Electric heaters, ovens, furnaces, temperature control systems
• Lighting Control –
  Industrial and commercial lighting systems
• Power Supplies & Automation –
  Power distribution, automation control panels, PLC systems
• Motors & Machinery –
  Small motors, industrial equipment, HVAC systems
• Electronic Equipment –
  Test equipment, control boards, embedded systems

Technical Specifications (Typical Range)

  Download User Manual   for detailed specifications.

Selection & Installation Guidelines

Correct selection and thermal design are critical for reliable SSR operation.

• Always select sufficient current margin to handle heat and surge current

• Use proper heatsinking for medium and high current SSRs

• Add protection components for inductive loads

Watch our YouTube tutorials:

•   Wiring & Setup Tutorial  

•   Application & Usage Demo  

FAQs – Solid State Relays (SSR)

How do I select the correct current rating?

Factory-recommended selection:

• SSR output current should be 3–5× the actual load current
  (to handle heat generation, surge current, and continuous operation)

Guidelines:

• Heater (resistive) loads → ≥ 3× load current

• Motor or inductive loads → ≥ 4–5× load current

For SSRs above 10A, a heatsink is required.
Optional fan cooling is recommended for improved reliability.

Do SSRs need heatsinks?

Yes, a heatsink is required in the following cases:

• Output current > 10A

• Long-time continuous operation

• Enclosed installation

• High ambient temperature (> 40°C)

• Inductive loads

What SSR type should I choose?

By control and load type:

• DC-AC SSR – DC control, AC load

• AC-AC SSR – AC control, AC load

• DC-DC SSR – DC control, DC load

By phase:

• Single-phase SSR – Heaters, lighting, small motors

• Three-phase SSR – Industrial heaters, machinery, HVAC

What protection is required for SSR applications?

For inductive or harsh load conditions, the following protection is recommended:

• RC snubber circuit

• Fuse or circuit breaker

• Over-temperature protection or thermostat

Can you provide OEM / ODM SSR modules?

Yes. We offer full OEM/ODM support, including:

• Custom labels and branding

• Terminal and wiring layout

• Casing design

• Special current and voltage ratings

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Email: ann@softstarterpro.com

WhatsApp: +86 180 0669 7926