Relay and Switch Technology

Nov. 15, 2002
For maximum power transfer, switch contacts should have zero resistance.

For maximum power transfer, switch contacts should have zero resistance. Unfortunately, clean contact resistance is directly proportional to volume resistivity of the contact material and inversely proportional to the contact area. This resistance typically is on the order of a few milliohms for pure metal-to-metal contact. But certain phenomena that occur during switching can deteriorate the interface and greatly increase contact resistance. The degree to which these phenomena affect contact resistance depends on contact materials, operating environment, contact pressure, and the type and magnitude of current switched.

Sponsored Recommendations

April 16, 2025
Clean. Compact. Less heat.
April 16, 2025
SEW-EURODRIVE Introduces DR2C motor, IE5 Ultra-Premium Efficiency Motor
March 31, 2025
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
March 31, 2025
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!