When are Solid State Relays a good choice?

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Accepted Answer

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.

Ambient temperature operation derated power	-5 ... 60 °C, 0.7 I_N
Conductor cross section control / main circuit	1.5 mm² / 10 mm²
Housing material	PPE
Ingress Protection	IP 20
Mounting	TH35 (EN 60715) or back panel mounting
Nominal screw torque control / main circuit	0.5 Nm / 1.2 Nm
Operation temperature	-5 ... 40 °C
Storage temperature (no ice)	-20 ... 80 °C
Weight	650 g

Overvoltage category	III
Pollution degree	3
Rated impulse withstand voltage open contact	4 kV / 1 min
Rated insulation voltage	660 V

Leakage current	1 mA
Number of contacts	1 NO
Number of outputs	1
Output type	SCR
Output voltage range	380 … 480 V
Peak reverse voltage	1,300 Vrrm
Rated current AC-1	50 A
Rated limit load	1,800 Asup2/sups
Rated voltage	400 V AC
Recommended minimum contact load	10 mA
Reverse voltage	1,200 Vrrm

Approvals	UKCA,CE,cULus,EAC
Standards	IEC/EN 60947,50022,60068

CPC1450