An overmoulded cable trap (302) for improved performance of an RF trap (102) is disclosed, wherein the RF trap (102) is placed on a section of an electrical cable (104) and fixed in position by overmoulding a thermoplastic material over both the RF trap (102) and the section of the electrical cable (104). The overmoulded cable trap (302) disclosed herein provides an RF trap (102) that has better shock protection, increased resistance to moisture, improved smoothness, is easier to handle and clean, is cheaper, can be created in very small packages where space is limited, can be easily sized to a range of diameters and lengths, is more reliable with respect to maximum rated voltage and less electromagnetic coupling to the environment, and generates less heat, than other designs of RF traps.