Waya wa constantan wa copper nickel alloy, womwe uli ndikukana magetsi pang'ono, yabwino yolimbana ndi kutentha komanso dzimbiri, yosavuta kukonzedwa ndikuwotcherera lead. Imagwiritsidwa ntchito popanga zigawo zofunika kwambiri mu thermal overload relay, low resistance thermal circuit breaker, ndi zida zamagetsi. Ndi chinthu chofunikira kwambiri pa chingwe chotenthetsera chamagetsi. Ndi chofanana ndi 's type cupronickel.