Question:
What is the contact resistance of a basic switch?
Answer:
The contact resistance is the resistance value (the initial resistance value is the CR before shipment) between the energized terminals when the contacts are in contact with each other. The resistance value of the contact area includes the conductor resistance of the spring and terminals.
The NC side (b-contact) is measured in the FP state and the NO side (a-contact) is measured in the TTP state.
Explanation:
The contact resistance is the resistance value (the initial resistance value is the CR before shipment) between the energized terminals when the contacts are in contact with each other. The resistance value of the contact area includes the conductor resistance of the spring and terminals. The NC side (b-contact) is measured in the FP state and the NO side (a-contact) is measured in the TTP state.
Keep the following in mind to increase contact pressure:
- The larger the OF, the larger the contact pressure.
- The larger the OF, the larger the contact pressure.
- The contact pressure is higher at the FP and TTP points during the stroke. Please note that in particular, contact pressure becomes almost zero near the point of contact switching (OP point, RP point), causing contact instability and potential chattering.
Product category
Switches Basic Switches
Classification
Selection, Characteristics
Related keywords
Basic Switch
Contact Resistance
Unstable Contact
Oxidation
Sulfurization
Contact Pressure
F-S Characteristics
CF-S Characteristics
Please visit the link below to see this product category on the Digi-Key website
Switches | DigiKey Electronics
This FAQ has been brought to you courtesy of
Please click the link below to view the original FAQ
What is the contact resistance of a basic switch? | FAQ | OMRON Device ＆ Module Solutions - Americas