Cage Clamp Contact Inserts From Harting, this series of robust cage clamp contact inserts are suitable for wire termination of 26-14awg (0.14 – 2.5mm²) and require no tooling. These cage clamp contact inserts are ideal for when quick and simplistic termination is required in heavy duty power applications. Available in 6 to 24 poles, they have a current rating of 16A and a working voltage of 500V.