A disconnecting device having a plurality of modules for disconnecting an electrical supply line of an intensity higher than 1000 A. Each module includes a tight contact casing (10) having at least one fixed-contact conductive element (12, 14) in contact with a mobile-contact conductive element (20, 26), and a mechanism for interrupting the contact between the fixed-contact element and the mobile-contact element so as to disconnect the supply line; metal connection bars (60, 62, and 64, 66) for connecting to a current input and to a current output; and intermediate conductive elements such as blades (68, 70, et 72, 74) connected to the connection bars and to the casing. At least one of the mobile-contact elements includes a silver pellet fixed to the surface of the element, allowing the contact resistance between the mobile-contact element and the fixed-contact element to be reduced by half.

A composition for coating an electrical contact point includes a silver powder and a fluorinated resin. The silver powder is dispersed in the fluorinated resin, and a weight ratio of the silver powder for the fluorinated resin is in a range from 0.4 to 1.

The present invention discloses a de-bouncing keypad and a preparation method thereof, wherein the keypad is composed of a rubber substrate and a metal contact having three layers of layered structures. A layer of tin alloy or lead alloy is plated on a surface of the metal contact by electroplating or chemical plating. The metal contact plated with the tin alloy or lead alloy has excellent contact bouncing resistance and arc-ablation resistance, and the metal contact is further composited with the rubber to shape and prepare the rubber de-bouncing keypad.

A nanocomposite structure includes a nanocomposite. The nanocomposite includes a bulk matrix phase and a nanophase filler disposed within the bulk matrix phase. The nanophase has a plurality of nanotubes including a material with thermal conductivity that is greater than the thermal conductivity of the bulk matrix phase of the nanocomposite. An electrical device includes a conductor in thermal communication with the nanocomposite structure formed from the nanocomposite.

A nanocomposite structure includes a nanocomposite. The nanocomposite includes a bulk matrix phase and a nanophase filler disposed within the bulk matrix phase. The nanophase has a plurality of nanotubes including a material with thermal conductivity that is greater than the thermal conductivity of the bulk matrix phase of the nanocomposite. An electrical device includes a conductor in thermal communication with the nanocomposite structure formed from the nanocomposite.

An arc-ablation resistant tungsten alloy switch contact and preparation method is disclosed. A contact member has a three-layer structure, wherein a first layer is a hydrophobic rubber layer, a second layer is a sheet metal layer, and a third layer is a tungsten alloy chemical deposition layer. A plating bath adopted in the chemical deposition contains 25-125 g/L soluble tungsten compound, 0-60 g/L soluble compound of a transition metal like ferrum, nickel, cobalt, copper or manganese, and 0-30 g/L soluble compound of tin, stibium, lead or bismuth. When a layered complex of the hydrophobic rubber layer and the sheet metal layer is chemically plated by the plating bath, a tungsten alloy plated layer is selectively deposited on a metal surface, and chemical deposition of the tungsten alloy does not occur on a surface of the hydrophobic rubber fundamentally.

An arc-ablation resistant tungsten alloy switch contact and preparation method is disclosed. A contact member has a three-layer structure, wherein a first layer is a hydrophobic rubber layer, a second layer is a sheet metal layer, and a third layer is a tungsten alloy chemical deposition layer. A plating bath adopted in the chemical deposition contains 25-125 g/L soluble tungsten compound, 0-60 g/L soluble compound of a transition metal like ferrum, nickel, cobalt, copper or manganese, and 0-30 g/L soluble compound of tin, stibium, lead or bismuth. When a layered complex of the hydrophobic rubber layer and the sheet metal layer is chemically plated by the plating bath, a tungsten alloy plated layer is selectively deposited on a metal surface, and chemical deposition of the tungsten alloy does not occur on a surface of the hydrophobic rubber fundamentally.

An arc-ablation resistant switch contact and a preparation method thereof is disclosed. The switch contact is a complex having a plurality of layers of layered structure, wherein a first layer is a hydrophobic rubber layer, a second layer is an adhesive layer, a third layer is a sheet metal layer, a fourth layer is an adhesive layer, and a fifth layer is a metal plated layer; wherein, the fifth layer of metal plated layer is formed by dipping a complex of the first layer, the second layer, the third layer and the fourth layer in a chemical plating bath containing refractory metal elements, and depositing on surfaces of the second layer, the third layer and the fourth layer in the complex by a chemical deposition method.

An arc-ablation resistant switch contact and a preparation method thereof is disclosed. The switch contact is a complex having a plurality of layers of layered structure, wherein a first layer is a hydrophobic rubber layer, a second layer is an adhesive layer, a third layer is a sheet metal layer, a fourth layer is an adhesive layer, and a fifth layer is a metal plated layer; wherein, the fifth layer of metal plated layer is formed by dipping a complex of the first layer, the second layer, the third layer and the fourth layer in a chemical plating bath containing refractory metal elements, and depositing on surfaces of the second layer, the third layer and the fourth layer in the complex by a chemical deposition method.

A switching electrical power contactor having a bi-blade type switch, has ferrous plates attached to the blades to increase the current carrying capacity and reduce the resistance of the switch. The contactor is incorporated on the outside of a mains meter enclosure or in a wall box for a mains meter, within the space defined by the sprung jaws of the meter socket.