Electronics modules that are not only equipped with an optocoupler for electrical isolation purposes but also with an additional switch amplifier are generally known as Solid State Relays (SSRs). The new and powerful solid-state relay MICROOPTO valve switch from Weidmüller is designed to switch very high load currents of 10 A in the 5-30 VDC voltage range across the entire ambient temperature range up to 55 °C. They are designed to safely and reliably control inductive loads, such as solenoid valves and contactors in particular. Errors are indicated via an auxiliary contact (5...48VDC / 0.1A), which indicates short-circuits as well as overloads.
Solid state relays offer several advantages in comparison with electro-mechanical relays: they operate extremely reliably over a long service lifespan, they are compact in size, have low drive power requirements and extremely fast response times. SSRs switch loads silently and bounce-free. They are insensitive to shock impact and vibration. And, in addition, they do not subject adjacent component groups to electromagnet emissions or switching sparks during switching operations.
The electronics in Weidmüller's MICROOPTO product range are packaged in an insulated, enclosed housing. The product range is equipped with the characteristics of a terminal block: pluggable cross-connectors (standard ZQV 4N), standardized marker solutions (WS12/6 MultiCard) and minimum design width. Top-drawer performance with minimum real-estate requirements are distinguishing characteristics of these SSRs boasting a design width of just 6 mm, a length of 90 mm and a height of 98 mm. Designed to snap onto DIN TS 35 mounting rails the modules are equipped with clamping yoke (screw) connection technology for conductor cross-sections up to 4 mm².
All of Weidmüller's SSRs undergo a functional and dielectric test. That guarantees 100 percent functionality and ensures reliable electrical isolation of the control and load circuits. MICROOPTO valve switches carry the CE mark. Further approvals such as cULus are being prepared.