An ultra-fast moving conductor for use with a circuit breaker is provided. The moving conductor includes a hollow outer stem and a removable core. Multiple removable cores are produced for use with the moving conductor for different purposes. The outer stem is produced from annealed copper that must be brazed before the circuit breaker is placed into operation, and a first removable core produced from copper is inserted into the outer stem to provide structural reinforcement to the outer stem during brazing. After brazing is complete, the copper core is removed from the outer stem, and a significantly lighter work hardened aluminum core is inserted into the outer stem. The lightweight aluminum core enables the moving conductor to open the circuit breaker much faster than the copper core would, and the copper core prevents contamination of the brazing furnace that would result from using the aluminum core during brazing.

What is disclosed is an electrode material including a sintered body containing a heat resistant element and Cr and being infiltrated with a highly conductive material. A powder mixture of a heat resistant element powder and a Cr powder is subjected to a provisional sintering in advance, thereby causing solid phase diffusion of the heat resistant element and Cr. After a Mo—Cr solid solution obtained by the provisional sintering is pulverized, the pulverized Mo—Cr solid solution powder is molded and sintered. A sintered body obtained by sintering is subjected to a HIP treatment. The highly conductive metal is disposed on the sintered body after the HIP treatment, and infiltrated into the sintered body by heating at a predetermined temperature. By conducting the HIP treatment, the withstand voltage capability and current-interrupting capability of the electrode material are improved.

A process for producing an electrode material by infiltrating a highly conductive metal such as Cu into a porous object containing heat-resistant elements. Before an infiltration step in which the highly conductive metal is infiltrated, a HIP treatment is given to a powder containing the heat-resistant elements (or to a molded object obtained by molding a powder containing the heat-resistant elements). The composition is controlled so that the HIP treatment yields a porous object which has a degree of filling of 70% or higher, more preferably 75% or higher. The highly conductive metal is infiltrated into the porous object having the controlled composition.

Electrical switching contact with radial magnetic field for a medium-voltage vacuum interrupter including a rod and a contact body, coaxial to the rod, which includes a disc and a circular element concentric with the disc and arranged protruding on a face of the disc, the other face of the disc being secured to the rod. The contact body has a spiral configuration; the disc includes slits in the thickness of the disc which extends from the periphery of the disc towards the centre of the disc; the circular element has an outer diameter smaller than the diameter of the disc. The disc and the circular element are made of a copper alloy with a refractory metal chosen from among chromium, tungsten and molybdenum, the alloy of the circular element including a proportion by weight of the refractory metal greater than that of the alloy of the disc.

An ultra-fast moving conductor for use with a circuit breaker is provided. The moving conductor includes a hollow outer stem and a removable core. Multiple removable cores are produced for use with the moving conductor for different purposes. The outer stem is produced from annealed copper that must be brazed before the circuit breaker is placed into operation, and a first removable core produced from copper is inserted into the outer stem to provide structural reinforcement to the outer stem during brazing. After brazing is complete, the copper core is removed from the outer stem, and a significantly lighter work hardened aluminum core is inserted into the outer stem. The lightweight aluminum core enables the moving conductor to open the circuit breaker much faster than the copper core would, and the copper core prevents contamination of the brazing furnace that would result from using the aluminum core during brazing.

A short-circuit current limiter has a vacuum switch in a main current path and a current-limiting unit connected in parallel therewith in a commutation current path. The vacuum switch has switching contacts. A material of contact pieces of the switching contacts is selected such that a mean value of the chopping current is at least 8 amperes.

The present disclosure aims to provide an electrical contact to which a low boiling point metal is added, the electrical contact being able secure both mechanical strength and conductivity at the same time. The electrical contact according to the present disclosure includes a base material made of Cu, particles of a high melting point substance dispersed in the base material, the particles being made of at least one of a high melting point metal or a carbide of the high melting point metal, and Te and Ti dispersed in the base material, wherein, the Te of 3.5 to 14.5 mass % is added where the total is 100 mass %, and Ti/Te is 0.12 to 0.38.

A network service and transformer safety protector on a secondary side of a network transformer tank system. The network service and transformer safety protector is positioned between the network transformer and a secondary network distribution system and is configured to connect and disconnect a transformer from the secondary network. The network service and transformer safety protector is attached to the outside of the transformer tank.

In an electric contact including a base material, high-melting-point substance particles, and an intermetallic compound, the intermetallic compound containing a MnX compound (X represents Te or Se) and a compound of a Mn—Cu solid-solution phase and X, is dispersed in the base material. If the Vickers hardness of the high-melting-point substance particles is higher than 0 Hv and lower than 200 Hv, the particle diameter of the high-melting-point substance particles is not smaller than 0.1 μm and not larger than 100 μm. If the Vickers hardness of the high-melting-point substance particles is 200 Hv or higher, the particle diameter is not smaller than 0.1 μm and not larger than 10 μm. The mass of X atoms is not lower than 1.5 mass % and not higher than 15 mass %. The atomic weight ratio Mn/(Mn+X) is not lower than 20 at % and not higher than 80 at %.

A contact piece for a high-voltage circuit breaker includes at least a contact pin and a contact carrier. The contact carrier is configured to mechanically fasten the contact pin in the high-voltage circuit breaker. The contact pin includes a contact shaft. The contact carrier and the contact shaft are formed as a monolithic contact element. A method for producing a contact piece is also provided.