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.
Select SSR based on load type, voltage, and surge conditions. Ensure rated current exceeds actual load current with margin (resistive, inductive, and capacitive loads have high inrush current). Choose correct AC or DC type. Verify supply voltage, transient voltage, and dv/dt limits. Add protection (fast fuse, RC snubber, MOV) and ensure proper heat dissipation with heatsink or fan for high current applications.
No Sparks or Noise – Silent, electronic switching with no arcing.
Long Service Life – No mechanical wear for continuous operation.
Fast, Accurate Control – Precise switching for reliable performance.
High Isolation – Safe separation between control and load circuits.
Industrial Durability – Shock, vibration, and humidity-resistant.
Wide Range – DC-AC, AC-AC, and DC-DC SSRs, single and three-phase options.
Industrial Heating
Lighting Control
Power & Automation
Motors & Machinery
Electronics
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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.
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
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
For inductive or harsh load conditions, the following protection is recommended:
RC snubber circuit
Fuse or circuit breaker
Over-temperature protection or thermostat
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