A vacuum interuptor consists of a cylindric ceramic housing which is on both ends gas tight closed by metallic caps. The contacts are brazed to the moveable repectively to the fixed electrodes which are connected to the bus-bars.

Contact materials of PLANSEE for vacuum interuptors have to fulfill various requirements.

In the medium voltage range high breaking currents up to 40 kA have to be handled and for vacuum contactors a life time of 1 million switching cycles are required.

Advantages:

• Very low gas contents
• Low contact erosion
• Low contact resistance
• Good getter properties
• Low chopping current
• Good welding tendency
• Brazing under vacuum possible

Versions:

Finished components:

• Fully machined contacts with final shape made of pressed and sintered respectively infiltrated CuCr, WCu or WCAg-ELMET materials

Semi-finished products:

• Discs of ELMET-materials as blanks for contacts

Forms of delivery:

Finished components:

• According customers specification