SSRs have an internal voltage drop across the semiconductor switch, which dissipates power as heat. You must use a heatsink sized for your specific load current and ambient temperature.
Solid State Relays (SSR) Component Intelligence
High-cycle, silent switching for demanding industrial control
What are Solid State Relays (SSR) components?
SSRs use semiconductor switching (SCR, TRIAC, or MOSFET) to provide infinite cycle life and silent operation. Unlike electromechanical relays, they require careful thermal management and are sensitive to surge currents and voltage transients.
How to Choose Solid State Relays (SSR) Components
Select based on load type, switching speed, and thermal constraints.
Load Type (AC/DC)
Ensure the output stage matches your load: TRIAC/SCR for AC, MOSFET or IGBT for DC.
Thermal Management
SSRs generate heat; calculate the required heatsink based on the load current and ambient temperature.
Control Signal
Match the input voltage range (e.g., 3-32VDC or 90-280VAC) to your PLC or microcontroller output.
Switching Mode
Choose Zero-Cross for resistive loads to reduce EMI, or Random-Fire for phase-angle control and inductive loads.
Surge Rating
Verify the I²t rating against your load's inrush current to prevent semiconductor failure.
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