Views: 351 Author: Site Editor Publish Time: 2022-06-10 Origin: Site
The electrical contact is a contact composed of silver or silver alloy wire and copper wire through a special cold forming machine based on mechanical and physical principles. It is an important part of high-voltage circuit breakers, switch cabinets, isolating switches, and grounding switches. Its performance directly affects the quality and service life of these high-voltage electrical appliances. When the contact rivets touches, the circuit is connected, and its relative movement can open or close the circuit, or keep the circuit connected by its rotation or sliding. At the same time, the electrical contact rivet is also the weakest link and the part that is prone to failure in switching appliances. Once the contact system fails to work normally, such as a short circuit in the power system, the high-voltage circuit breaker contacts refuse to open, which will cause extremely serious consequences. So, it is important to learn about electrical contact.
Classification of Electrical Contacts
1. Fixed Contact
Electrical bimetal contact rivets compressed with fasteners such as screws or rivets are called fixed contacts, and fixed contacts do not move relative to each other during work.
2. Dividable Contact
Electrical silver contact rivets that can be separated during work are called separable contacts. Electrical contacts are always in pairs, one of which is a static contact, and the other is a moving contact. The contacts are generally compressed by springs when they are closed.
3. Sliding and Rolling Contact
In the working process, the silver bimetal contact rivets can slide or roll with each other, but the electrical contact that cannot be separated is called sliding and rolling contact.
Application of Electrical Contacts
As the core component of medium and high voltage switchgear, electrical silver contact points for contactor play the role of breaking and conducting. They are mainly used in relays, contactors, air switches, current limit switches, motor protectors, micro switches, instrumentation, household appliances, automotive electrical appliances, leakage protection switches and many others.
Electrical Contact Material
The electrical contact components material is a conductive material suitable for energizing or connecting a circuit. According to the load of the working current, it can be divided into strong or medium electrical contacts used in the power industry, and weak electrical contacts in instruments, electronic devices, computers and other equipment. Contact center components materials usually include silver nickel, silver copper oxide, fine-grained silver, silver cadmium oxide, silver tin oxide, silver tin oxide, indium oxide, and silver zinc oxide. Stamping parts materials mainly include red copper, brass, phosphor bronze, bronze, tin copper, beryllium copper, copper nickel, zinc cupronickel and stainless steel.
Electrical Contact Processing
For electrical contact applications that do not require full automation, you can choose semi-automatic or manual assembly manufacturing. These are ideal service parts and prototypes. Through semi-automatic or manual assembly, parts can be mass-produced, from a few pieces to hundreds to tens of thousands. The tools used are simpler than automatic assembly, and the cost is much lower.
Components usually include contact rivets, contact strips, solder contacts, solder contacts, plastic parts, springs, terminals, and other parts. The delivery time of prototype tools is much shorter than that of fully automated tools. Moreover, the tooling parts usually used for semi-automatic assembly can be incorporated into the automatic assembly tooling, which reduces the overall cost of the automatic assembly tooling. Assembly techniques mainly include welding, brazing, scribing, stamping, forming and embossing.