The most common type of relay in use is the electro-mechanical relay - consisting of an electrical component, the coil, and a mechanical part and the contact. The simplicity of this relay and its low cost has lead to its use in nearly every switching process for control system ins and outs.
In the case of electro-mechanical relays, coil voltages are available for all industrial requirements from 5VDC to 240VAC. Engineers and technicians can also choose from contacts that switch up to 16A.
Electro-mechanical are best suited to applications that require switching up to five times per minute. They are ideal for standard industrial use for PLC/DCS output 0.5 to 10A resistive load and where isolation up to 4kV is required.
The contact material features a plating of around 5um of pure gold. As gold does not tarnish and has the lowest resistance, signals can be switched down to 100mV at 100uA to accommodate most low-level signals.
Purposely designed to meet the needs of high speed switching, solid state relays incorporate Triac and MOSFET technology. Depending on the output configuration, triacs are used to switch AC and MOSFETs to switch DC.
Weidmuller
Weidmuller is a leading manufacturer of components for electrical connection technology including Terminal Blocks, Marking Systems, Heavy Duty Connectors, PCB Components, Sensor-Actuator-Distributors, Electronics Products, Tools, Enclosures and Customized Production.
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