An improved electrical contact alloy, useful for example, in vacuum interrupters used in vacuum contactors is provided. The contact alloy according to the disclosed concept comprises copper particles and chromium particles present in a ratio of copper to chromium of 2:3 to 20:1. The electrical contact alloy also comprises particles of a carbide, which reduces the weld break strength of the electrical contact alloy without reducing its interruption performance.

Fuse devices and electrical systems using the fuse devices are disclosed, with the fuse devices having internal components to cause a fuse blown event when the pre-determined current level is reached through the contacts. The internal components can comprise a levitation actuator that causes separation between one or more of the contacts as the current level approaches the predetermined level. This causes contact levitation and arcing, which increases the resistance at the contact being separated. This in turn causes the current through the contacts to seek another path that in the embodiments herein is a path to a pyro feature. The current activates the pyro feature, which causes the contacts to separate and puts the fuse device in fuse blown condition where currents can no longer flow through the contacts.

An electrical contact tip for switching applications. The contact tip includes a body having a first layer and a second layer. The first layer arranged on the second layer and adapted to come in contact with a corresponding contact tip during switching operations. The first and second layers consist of Ag-composites of one or more elements, compounds or alloys, where the hardness of the first layer is lower than the hardness of the second layer.

A method for forming a contact piece for a circuit breaker, the contact piece comprising a reinforcement phase and a conductive phase, the method comprising: providing a slurry of the reinforcement phase in liquid; freeze casting the slurry, to form a cast comprising a frozen liquid structure and a reinforcement phase structure; removing the frozen liquid structure from the cast, to form a foam comprising the reinforcement phase structure; sintering the foam, to form a sintered foam; and infiltrating the sintered foam with the conductive phase, to form a piece part.

According to one embodiment, a vacuum interrupter includes a vacuum insulation container, a fixed side contact provided in the vacuum insulation container, and a movable side contact provided in the vacuum insulation container and configured to contact and separate from the fixed side contact. A first contact surface of the movable side contact configured to contact the fixed side contact is planar. A second contact surface of the fixed contact configured to contact the movable side contact is spherical protruding toward the movable side contact.

According to one embodiment, a vacuum interrupter includes a vacuum insulation container, a fixed side contact provided in the vacuum insulation container, and a movable side contact provided in the vacuum insulation container and configured to contact and separate from the fixed side contact. A first contact surface of the movable side contact configured to contact the fixed side contact is planar. A second contact surface of the fixed contact configured to contact the movable side contact is spherical protruding toward the movable side contact.

The invention pertains to a method for manufacture and use of pesticides or agricultural spray adjuvants that counteracts the effects of hard water cat ions on anionic pesticides when applied in water spray solutions.

An electrical contact tip for switching applications. The contact tip includes a body having a first layer and a second layer. The first layer arranged on the second layer and adapted to come in contact with a corresponding contact tip during switching operations. The first and second layers consist of Ag-composites of one or more elements, compounds or alloys, where the hardness of the first layer is lower than the hardness of the second layer.

The invention relates to a silver electrolyte for the deposition of silver layers on substrates, which comprises potassium silver cyanide, potassium cyanide with a content of at least 10 g/L, at least one grain refiner with a content of 0.2 to 10 g/L, at least one dispersant with a content of 1 to 10 g/L and at least one solid component with a content of 1 to 150 g/L, wherein the particles of the solid component have an average particle size (d.sub.50) of 10 nm-100 m. Furthermore, contact surfaces and methods for the deposition of such contact surfaces are shown and the use of the electrolyte according to the invention in strip electroplating.