Tungsten Point

A combination of copper and tungsten provides a cost efficient relay contact that resists both arcing and corrosion. However they need to be cleaned or burnished occasionally.

Tungsten-copper contactor is suitable for using the circuit up to the rated voltage 660V AC 50HZ or 60HZ,rated current up to 95A,for making, breaking,frequently starting and controlling the AC motor. Combined with the auxiliary contact block,timer delay and machine interlocking device etc.,it becomes the delay contactor,mechanical interlocking contactor, star-delta starter. With the thermal relay. It is combined into the electromagnetic starter.

Application:

Tungsten point/contact is widely used in relays.The term Relay generally refers to a device that provides an electrical connection between two or more points in response to the application of a control signal. The most common and widely used type of electrical relay is the electromechanical relay or EMR.
The relay tungsten point/contacts are electrically conductive pieces of metal which touch together completing a circuit and allow the circuit current to flow, just like a switch. When tungsten point/contacts are open the resistance between the contacts is very high in the Mega-Ohms, producing an open circuit condition and no circuit current flows. When the contacts are closed tungsten point/contact resistance should be zero, a short circuit, but this is not always the case. All relay contacts have a certain amount of "contact resistance" when they are closed and this is called the "On-Resistance", similar to FET's. With a new relay and contacts this ON-resistance will be very small, generally less than 0.2Ω's because the tips are new and clean.

Any questions and feedback will be warmly welcome by email to sales@chinatungsten.com or telephone to 86 592 512 9696, 86 592 5129595.