When are Solid State Relays a good choice?

Solid State Relays (SSRs) are particularly interesting when special requirements regarding environment, switching frequency or signal quality apply:

• Robust against mechanical stress: SSRs are resistant to vibration and shock.
• Frequent switching cycles / fast switching: Without mechanical contacts, SSRs are ideal for applications with many switching operations or high switching frequency.
• Rare switching operations: Even with very low switching frequency, SSRs remain reliable since no contact corrosion can occur.
• Very long service life: With no moving parts, SSRs hardly wear out and achieve a much longer lifetime than electromechanical relays.
• Low-noise or silent operation: They operate completely noiselessly and without contact sparks.
• Zero-cross switching in AC: Many SSRs switch at the zero-crossing of the AC voltage and thereby reduce voltage spikes, especially with inductive loads. Our CSS-Z* and R10-Z1Z* series feature zero-cross switching.

Note: At higher loads, SSRs generate heat. Depending on the application, suitable cooling or mounting on a heat sink is required.