A composition includes particular amounts of a poly(phenylene ether); a poly(alkylene terephtalate); a hydrogenated block copolymer of an alkenyl aromatic monomer and a conjugated diene; a compatibilizing agent; an arc suppressant comprising a nitrogen-containing compound, a phosphorus-containing compound, or a combination thereof; glass fiber, a mineral filler; and poly(tetrafluoroethylene). The composition can be particularly useful for use in molded circuit breakers.