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Repco
By: David Howard | G+

About Electrical Contacts

Let’s begin with the basics about contacts. It’s also called a tip, point, finger, wedge, button and segment. A single or multi-pole product that contains movable and stationary contacts, often including screws, springs and possibly other hardware is called a kit or set.

A contact opens and closes (makes and breaks) to engage or interrupt an electrical circuit. It’s made to be replaced. It wears electrically (burning) and mechanically. It is found in switches, relays, contactors and motor starters.

When electricity is supplied to the coil in the contactor, it acts like a magnet. This magnetic action pushes or pulls a magnetic plate that slides or claps the movable contact together with the stationary. Please see the illustration below.

Electrical Contact Example 

Copper only is often the material of choice when making/breaking more than one time per hour. You will often find copper-only contacts in DC applications, particularly cranes. They don’t appear to be copper, because in the great majority of cases, they have been plated. The plating can be with silver, nickel or cadmium. The plating helps prevent the build up of copper oxide (green rust), which is non-conductive.

When closed for long periods of time (8 hours) copper only contacts have a tendency to ’stick’ or weld and need silver pads of varying thickness. Generally speaking, the more amps, the thicker the pad will be. Pure silver pads are found sometimes in DC applications. The material of choice, however, is most often silver-cadmium oxide. The mix is usually 85/15 or 90/10. These contacts are found in most AC contactors for NEMA size 00-6. A 50/50 silver tungsten mix is used for high-amp applications. The tungsten is very hard and often used for circuit breaker applications.

Below you’ll find photos of the basic parts of a contactor. This particular example is a GE size 2, CR305D0** in the 100, 200, 300 Line. The replacement contact set is found on page 53 in the Repco Electrical Contact catalog. The photos are from the top down, as you would take the contactor apart. The sizes of the contactor and various parts are not in relational proportion to each other.

GE Contactor CR305D0**
GE Contactor CR305DO

Top Magnet Assembly
Top Magnet Assembly
 
Operating Coil
Operating Coil

Lower Magnet Assembly
Lower Magnet Assembly
 
Top View - Movable Contact Support
Movable Contact support




Bottom View - Movable Contacts in Support
Movable Contacts In Support

Stationary Contacts in Support
Stationary Contacts In Support

Repco Replacement 3 Pole, Size 2 Contact Set - 9723CG
Repco Replacement 3 Pole Size 2 Contact Set - 9723CG
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Wishing you a great day! My name is Nick Johnson, and I’m writing to you from FireplaceStoreFinder, a trusted directory linking homeowners and designers with top-tier fireplace and stove businesses across the nation. From our inception in 2025, our directory has grown to feature over 2,500 vetted fireplace and stove providers, showcasing a variety of electric, gas, and wood-burning fireplaces, as well as patio heating products. We believe your company, with its strong industry presence, would be a perfect addition to our community. We’d love to have you become part of our directory to enhance your exposure among a dedicated clientele of customers seeking top-notch fireplace and stove services. Listing with us is straightforward and designed to showcase your products to homeowners and designers. To learn more about this opportunity, please visit our website at: FireplaceStoreFinder.com Visit and submit your business details. Alternatively, feel free to reply to this email, and I’ll be glad to guide you through the process. We appreciate your time and consideration. We’re excited about the possibility of showcasing your business in our growing community. Best regards, Nick Johnson FireplaceStoreFinder Team 8024 Glen Ridge Drive, New York, NY, 10128

8/19/2025 2:58:52 AM

~ Nick Johnson
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Very informative and helpful. Thanks

5/15/2012 1:36:30 PM

~ bill

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