Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971


Over-drive, stated as a percentage, is the extra Ampere-turn applied to a reed contact after closure, before measurement of Contact Resistance. This is done to fix the direction of the remanent flux. Contact Resistance of a reed contact is usually measured at 25% overdrive. Overdrive when using a magnet is achieved by moving the magnet closer than the actuation point. Using a Reed Switch in an application with a higher Over-drive gives a longer life.

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