Relays & Contactors

Relay Contact Resistance

Contact resistance is a crucial electrical characteristic. The resistance between the contact terminals determines the Relay's ability to carry current. The contact resistance is subject to change during the life of the Relay. Based on lab investigations and testing, abnormal contact resistance has often been found with the following conditions:

One common electrical characteristic that is specified of Relays is the pick-up and drop out voltage. These values are defined as follows: