Internal Oxidation

Description:

Two Side Oxidized- produced by internally oxidizing a wrought silver/cadmium alloy from both sides leaving a centrally located thin depletion layer of unoxidized silver rich material. A secondary operation bonds fine silver to one side producing a backing layer for contact attachment.

Single Side Oxidized – produced by internally oxidizing a wrought silver/cadmium alloy from one side only, leaving a solderable unoxidized AgCd layer. This material is monolithic; i.e., the AgCd and AgCdO layers are formed from the same wrought alloy.
Refer to Checon’s specification sheet for details.

Electrical Characteristics:

AgCdO – displays excellent arc erosion characteristics, however they have a somewhat higher welding tendency than equivalent silver/cadmium oxides produced by powder metallurgy. The arc mobility in internally oxidized materials can be 1.5 to 2.0 times faster than on powder metallurgically produced surfaces. Arc quenching properties are excellent.

Applications:

AgCdO – the low arc erosion and outstanding current interruption capabilities coupled with good anti-welding properties make these contact materials especially suitable for use in many general purpose AC switching applications. Contactors of all sizes, relays, control switches, railway switch gear and some circuit breakers are examples of applications. These materials perform well even in devices with low magnetic arc blowing characteristics and in devices with long lifetime projections.