MEXICOWANDERER wrote:

This is a good price if multiple items can justify the shipping charges.

The Tyco is a proven sealed unit. It lasts me years in continuous duty radiator fan duty.

https://www.parts-express.com/te-connect........ay-spdt-20-30a-(formerly-bosch)--330-070

Try using a FREEWHEELING DIODE across the power contacts when an inductive load is being switched. Amazing increase in contact life.



Freewheeling or Fly back diodes and their function
Freewheel or Fly back diodes are used across inductive components such as coils to prevent voltage spikes when the power is turned off to the devices.

When power to inductive loads such as coils and inductors is turned off, there is a sharp voltage spike. The direction of this voltage is opposite to the applied voltage in accordance with Lenz’s Law.

When a current flows through the coil of a relay, the coil gets electromagnetically charged. The energy is stored in the magnetic field around the coil. When the power supply to the coil is interrupted and the current in the coil tends to decrease, the magnetic field discharges causing a surge in the voltage.

The voltage, thus induced, can jump across the contacts of relays connected to the coils. The sparks and arcing produced can affect the life of the contacts. The voltage spikes can also damage electronic components like transistors which may be driving the relay coils.