How light switches are made
The quick-break switch, invented in 1884, snaps the contacts apart so they do not burn.
- stations
- 8
- things upstream
- 85
- raw sources
- 26
- steps from the ground
- 10
The short version
Presses stamp copper or brass into contacts, terminals and spring parts. Hot plastic is molded around metal inserts to make one solid body. Assembly machines feed parts, lock screws and test force as they go, and finished switches are checked for contact resistance and insulation, with life tests that flip them thousands of times.
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Stamp the contacts
High-speed presses punch and bend copper or brass sheet through a continuous die to make contacts and terminals. One stamping supplier holds errors to within 0.01 to 0.05 millimeters, so parts touch tightly and do not arc or overheat.
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Rivet the silver points
A plug and socket maker in Wenzhou, China, adds silver contact points with automatic welding and riveting. Integrated dies can punch, bend and rivet a part in one run.
Goes in -
Form the spring
A spring is formed that sets the feel of the flip and, in a quick-break design, snaps the contacts apart.
Goes in -
Mold the body
Hot flame-retardant plastic flows into a mold around metal pieces and cools into one strong part. At the Wenzhou plant, five-axis robot arms place the copper inserts and chilled water cools the work.
Goes in -
Assemble the mechanism
Parts go together on a line where machines feed pieces, lock screws, test force and run high-pressure checks while skilled workers watch. One company reports working 30% faster with automated assembly.
Goes in -
Check function and contacts
Inspectors measure incoming parts and coating thickness, adjust molds and tools during assembly, then test each finished switch for function and contact resistance.
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Flip it thousands of times
Life testing flips the switch thousands of times. Other tests cycle its load and temperature, expose it to humid air and check insulation resistance before shipping.
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Pack for shipping
Blister packs or plastic trays keep switches apart, and antistatic materials protect inner parts on the way to the store.
Goes in
Worth repeating
- John Henry Holmes invented the first quick-break light switch in 1884 in Newcastle upon Tyne.
- The quick-break design fixed the problem of contacts burning from arcing as they slowly came apart.
- William J. Newton invented the toggle light switch in 1916.
Back to the ground
Follow every input upstream and light switch starts as these 26 raw sources.
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Sources
- Light switch
- Injection molding
- Wall Switch Basics: Easy Guide to How They're Made
- Analysis of Switch Socket Precision Custom Metal Stamping Parts
- Stamping Riveting Electrical Copper Press Parts For Switch Sockets
- Factory Show & Manufacturing Capacity (Kripal)
Cite this page: "How light switches are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/light-switch