Abstract In an electrical switching device which includes insulating parts subjected to the influence of electric arcs, the insulating parts are formed of mouldings having a binder which consists essentially of a mixture of a linear acrylate polymer and a monomeric acrylate compound which is polyethylene glycol dimethacrylate or a polyethylene glycol diacrylate converted into polymerized form. The binder may contain an additive resin containing ethylenically unsaturated groups in the monomeric acrylate compound in a quantity of at most 25 percent of the total weight of linear acrylate polymer, monomeric acrylate and additive resin. The binder may also contain a powdered filler or a fibrous reinforcing material.
Electric switching device according to claim 1, comprising a high voltage circuit breaker comprising an extinguishing chamber, in which the insulating part constitutes an extinguishing chamber plate in the extinguishing chamber.
Claim 2
Dependent Claim
58 words
Electric switching device according to claim 1, in which the binder contains an additive resin containing ethylenically Unsaturated groups which are polymerisable with the unsaturated groups in the monomeric acrylate compound, the weight of the additive resin constituting at the most 25 per cent of the total weight of linear acrylate polymer, monomeric acrylate compound and additive resin.
Claim 3
Dependent Claim
35 words
Electric switching device according to claim 1, in which the linear acrylate polymer consists essentially of a polymer of at least one member from the group methyl methacrylate, methyl acrylate, ethyl methacrylate and ethyl acrylate.
Claim 4
Dependent Claim
39 words
Electric switching device according to claim 1, in which the monomeric acrylate compound consists essentially of a dimethacrylate or diethacrylate of a member from the group diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, hexaethylene glycol and heptaethylene glycol.
Claim 5
Dependent Claim
40 words
Electric switching device according to claim 1, in which the quantity of linear acrylate polymer is 10 - 40 per cent and the quantity of monomeric acrylate compound 60 - 90 per cent of the total weight of these substances.
Claim 6
Dependent Claim
31 words
Electric switching device according to claim 1, in which the moulding contains a powdered filler in a quantity of at the most 70 per cent of the weight of the moulding.
Claim 7
Dependent Claim
32 words
Electric switching device according to claim 1, in which the moulding contains a fibrous reinforcing material in a quantity of at the most 60 per cent of the weight of the moulding.