OVERMOULDING MADE OF SMC OR BMC COMPOSITE MATERIAL FOR VACUUM CIRCUIT-BREAKER POLE

摘要

The invention relates to a pole for a circuit-breaker that includes an assembly comprising a vacuum bulb having a housing made of a material having a thermal expansion coefficient a1 and two electrically conducting connections, and an overmoulding layer applied on the assembly and having a thermal expansion coefficient a2, characterised in that the overmoulding layer is made of a SMC or BMC material having a thermal expansion coefficient a2 that is constant and lower than 25.10-6 °C-1, a dielectric stiffness higher than 8 kV/mm and a perpendicular modulus of rupture in bending higher than 40 MPa, said overmoulding layer being used both for electrically insulating the assembly and ensuring the dielectric and mechanical resistance of the assembly.