Sta-Kon RZ3 POLYCARBONATE INS RING TERM GRN M3

The RZ3 is sized for 0.25 to 0.75 mm2 conductor, which is roughly 24 to 18 AWG. That is control and signal wiring, not power feeders. If your conductor is 16 AWG or larger it will not seat in this barrel and you need the next size up in the series.

It is an M3 ring, so it drops over an M3 stud or screw, the size you typically find on terminal blocks, small ground screws, and control panel studs. For a #6 or larger screw, pick a different ring size.

Green is the insulation color code on this terminal and it identifies the wire range, 0.25 to 0.75 mm2, at a glance during inspection or troubleshooting. It is not a ground-only marking. Electricians working to a color-coded kit use it to confirm the right barrel size was crimped without pulling the conductor.

Neither. The RZ3 uses a polycarbonate insulating sleeve, which holds up better to heat and crush than soft vinyl and is more rigid than nylon. If your spec calls out a vinyl-insulated ring terminal, this is not a drop-in match on the insulation material.

An insulated-terminal crimper is what this takes. The RZ3 is a closed, pre-insulated barrel, so an open-barrel (non-insulated) die will crush the polycarbonate sleeve instead of forming the barrel around the conductor. Use the die station matched to the 0.25 to 0.75 mm2 range.

Go with the ring, like the RZ3, anywhere the connection is subject to vibration or where a loosened screw must not let the wire escape, since the M3 ring is captive on the stud. A fork or spade terminal is the better pick only when you need to pull a wire off a crowded terminal strip without fully backing the screw out. On motor control and equipment grounding points, rings are the standard.

Electrolytic copper. That matters on two counts: low contact resistance on low-current control circuits, and compatibility with copper conductors without the dissimilar-metal concerns you get pairing aluminum terminals to copper wire. Plated-copper ring terminals are the normal choice for panel work for this reason.

Sweden. Institutional and government buyers who have to document country of origin on a submittal can list it as SE.

The part number is RZ3, a green polycarbonate insulated ring terminal with an M3 ring and a 0.25 to 0.75 mm2 wire range. Distributors stocking the RZ series should order by that designation; the neighboring sizes in the series differ by wire range and ring hole, so matching the stud size and the conductor cross-section is what distinguishes one from the next.