A reinforced flame retardant composition comprising: 30-80 wt% of a polymer component comprising 25-65 wt% of a poly(alkylene terephthalate); 5-25 wt% of a poly(phenylene ether); optionally, 5-35 wt% of a polyamide; 5-30 wt% of a reinforcing mineral filler, preferably talc, 5-35 wt% of glass fibers; 4-25 wt% of a flame retardant component comprising: a metal di(C1-6alkyl)phosphinate and an auxiliary flame retardant; 0.01-2 wt% of a compatibilizing agent; 5-15 wt% of an impact modifier; wherein a molded sample of the composition has a UL94 rating of V0 at thicknesses of 1.5 mm and lower; and a comparative tracking index of 250-399 volts, preferably 400-599 volts, more preferably 600 volts or greater as determined in accordance with UL 746A, a mean time of arc resistance of at least 120 seconds as determined according to ASTM D495, or a combination thereof.
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