An electrical connector union coupler assembly including a coupling subassembly and a collet retainer. The coupling subassembly includes a coupling sleeve rotatably connected to a coupling body. The coupling body includes a first end with a threaded section and a first surface adapted to press against a first set of electrical connector wedges. The coupling sleeve is constrained on the coupling body for substantially only rotational movement relative to the coupling body. The collet retainer has a first end movably connected to the coupling sleeve by a threaded connection. The collet retainer includes a second end with a threaded section and a second surface adapted to press against a second set of electrical connector wedges.