Information

• Due to the characteristics of inductors (the coil), the coil can send damaging voltage spikes into the circuit when de-energized.
• A “flyback” diode and resistor is a good solution to sudden voltage spikes. Sometimes these items are built into the relay housing, but sometimes they must be added externally.
• The specification sheet for the specific relay model may need to be consulted if the customer is not sure.
• Many spec sheets will suggest the diode type, connection details and resistor values for proper long-term operation.
• As diodes are polarity-sensitive devices, it is important that the relay is connected to Q-SYS in the way shown.