2,808
edits
Changes
→6.2 Contact Materials and Design of Contact Components
|Rivets, clad stamped parts, (gold plated rivets), welded contact parts
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|Sliding contacts in miniature motorsAuxiliary and control relays|Very high frictional wear resistanceHigh reliability over extended life span, sure contacting even at very low contact forcesresistance|Ag and Au alloysAgNi 0, Pd alloys15, Au multi component alloysAg/Ni|Brushes from flat rolled wire or stamped; collector hard gold electroplated or Rivets, cladprofile parts, or made from miniature profile segmentswelded contact parts
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|Centrifugal controllers for small motorsCam switches (higher loads)|Little shape changesHigh arc erosion and weld resistance, defined contacting at very low contact forces and high frequency of operationresistance|Pd alloysAgCu, Ag/Ni, Ag/SnO2, Ag/ZnO, (Ag/CdO)|Contact rivetsRivets, welded contact screws, welded parts
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|ConnectorsContactors|Low contact High arc erosion and weld resistance, corrosion resistance, sufficient frictional wear low contact resistance, good sliding capabilities|I< 20A : Ag and Au alloys/Ni, Pd, PdNi; For automotive and consumer electronic at low operation numbersAg/SnO2 I>20A : Ag/Sn and Sn alloysO2, (AgCdO)|Electroplated layers or clad, often Au flash plated, mostly with Ni substrate layer, stamped parts from hot tin dipped stripWelded and brazed contact tips
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|Telecommunication relaysMotor -protective circuit breakers|Reliable contacting even at Extremely high operational frequencyweld resistance, low contact resistance|Ag/ZnO, AgPd, Au alloys, PdRuAg/C against Ag/Ni|RivetsWelded contact parts, welded profile segmentstoplay stamping parts
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|Reed relay contactsPower switches and circuit breakers|High reliability at Extremely high arc erosion and weld resistance, low currents independent of atmospheric environmentcontact resistance|AuAg/ZnO, Ag/SnO2 , Ag/C against Ag/Ni o. Ag/W, Ag/W, (Rh)Ag/WC/C, Ag/W against Ag/CdO|Switch paddles FeNi with partially diffused Au, (electroplated Rh)Brazed and welded contact tips and formed parts
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|Relays in electronic circuitsPower switches with arcing and main contacts|High reliability at weld resistance, low switching loads and compact device designcontact resistance, high arc erosion resistance|Au alloysArcing contacts: W/Ag, AgPdW/Cu, (Cu) Main contacts: Ag alloys/Ni, Ag/ZnO, Ag/W, Ag/WC|Stamped springs from seam-welded profiles, Brazed and welded miniature profile (tape) segments, contact rivetstips and formed parts
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|GP relais (Elementary relays)Disconnect switches|Low arc erosion, high weld contact resistance, low and consistent contact resistancesufficient mechanical strength|Ag/NiAgNi 0, Ag/SnO215, (Ag/CdO)Ni, Ag/ZnO,AgNi0.15, (Agelectroplated)|Solid and composite Electroplated coatings, brazed contact rivets, welded miniature profile (tape) segmentsparts
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|Automotive relaysHigh voltage circuit breakers|Low material transfer, Arcing contacts: highest arc erosion resistance Main contacts: low contact resistance, high weld resistance|AgNi0.15, AgArcing contacts: W/SnO2Cu-infiltrated Main contact CuCrZr silver plated, Ag/Ni|Contact rivetsCast-on, electron-beam welded miniature profile (tapeor brazed) segmentsformed parts, percussion welded pins
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|Flasher relays Load disconnect switches (automotive, > 3 Mio operationsmedium and high voltage)|Low material transfercontact resistance, sufficient mechanical strength, high arc erosion resistanceof precontacts|Arcing contact: W/Cu, Cu, low Ag/C Main contact resistance|PdCu15 and 40 (Anode) vs. AgNi0.15: Cu, AgCu3 (Cathode)CuCrZr silver plated, Ag/ZnONi, AgNi0,15, Ag/SnO2C|Contact rivetsArcing contacts: brazed or welded parts Main contacts: silver plated, brazed or welded miniature profile (tape) and strip segmentsparts
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|Breaker points (automotive ignition)