The Solid State Relays (SSR) are electronic devices used for switching resistive or inductive AC loads with many advantages over the conventional relays. A control voltage applied to the device INPUT turns the SSR ON, energizing the load. The conduction effectively occurs at the next zero crossing of the mains voltage. When the INPUT signal is removed, the SSR turns OFF when the load reaches a current equal to zero.
This means that the load switching may be delayed by ½ of mains period (or 8.3 ms for the 60 Hz mains). Turning the output ON and OFF only on the mains voltage zero crossing brings important performance advantages to the system: practically no EMI is generated during the load switching and the SSR is submitted to less severe switching conditions. On the other hand, the SSR is suitable to AC loads only (it cannot be used to switch DC loads).
- Applications:
- Blade Manufacture for Wind Turbines
- Pump automation
- Integrated Chemical Production Automation
- Academic work benches for technical schools and higher education institutes
- Automation solutions for the Petrochemical Industry
- Distribution Monitoring
- Medication manufacture and preparation
- Intelligent lighting activation
- Data Acquisition in Oil Production
- Monitoring, Recording and Data Control at a Distance
- Refrigeration
- Meatpacking Industry
- Food and ingredients
- Laboratory monitoring in technical schools and universities
- Automation in the footwear industry
- Temperature control in furnaces for automotive glass
- Validation of Computerized Systems
- PLC programming kits
- Moving overhead cranes
- Utilities monitoring in the automotive industry
- Charcoal production for the steel industry
- Automation and Monitoring of Treatment Plants
- Monitoring at point of sale
- Industrial Automation in Textile Finishing
- Chemical and Biological Laboratories
- Greenhouses for vegetable production
- Process simulating work bench
- Wireless temperature control in laboratories and hospitals
- Production monitoring and ANDOM
- Pump House control - Hot / Cold water supply systems
- Teaching kits
- Temperature and humidity control in clean rooms
- Pharmaceutical warehouses
- Freight monitoring
- Process Control in the Chemical Industry
- Monitoring utilities
- Monitoring, power control and data logging
- Load current (IL): 40 or 90 A
- Load voltage: 40 to 530 V rms
- Turn-on voltage (Vssr): < 1,5 V rms
- Leakage current: < 1 mA
- Frequency: 47 to 63 Hz
- dv/dt: 300 V/µs
- Control voltage: 4 to 32 Vcc
- Control current: 15 to 20 mA
- Switching time: < 10 ms
- Control method: Zero cross trigger (resistive load)
- Electrical insulation: > 2000 V rms
- Operating temperature: -40 to 80 °C
- Status Indicator: LED