What aspects should be selected according to the safety relay connected to the controller?

Safety relays are relatively common electrical appliances in industrial circuits. Many people are unaware of safety relay options. How to choose a high-quality safety relay is a problem for many people. So what should be the basis for choosing a safety relay? Select the rated operating current of the safety relay coil: For DC safety relays controlled by transistors or ICs, the rated operating current of the coil (generally twice the starting current) should be within the following output current range: output excitation circuit.

Select the contact type and contact load of the safety relay: the same type of relay usually has a variety of contact methods to choose from (safety relays include single-group contacts, double-group contacts, usually (normally open contacts, normally closed contacts, etc.), multi-group contacts ), the contact type of the application circuit should be selected reasonably. Select the power supply voltage of the safety relay coil: When choosing a safety relay, give priority to whether the power supply voltage of the relay coil is AC or DC. The rated working voltage is usually less than or equal to the working voltage of the control system.

Reasonably choose the size of the safety relay: the size of the relay is generally related to the size of the relay contact load. According to the needs of the application circuit, many relays of this product should be selected. The above four points are the four aspects that should be considered in the selection of safety relay connection controller