GE's GEMTRAP line of fixed, harmonically suppressed capacitors permit the installation of power factor correction capacitors on systems with nonlinear load components. The GEMTRAP system can be tuned to a desired frequency but is normally tuned to the 4.7th harmonic.
Three phase self-healing metallized capacitors
Three fuses for each step
Optional blown fuse indicating lights
Harmonic filter reactors typically tuned to the 4.7th harmonic