Clearance - final unit. This is one new, unused switch left over from our own parts order, not a second, and our 12 month warranty still applies. We won't be restocking this model. For a plain on-off toggle we keep on the shelf, see our KN3C-101 toggle switch.
A momentary toggle switch does two jobs with one lever. Flick this NKK S9AWF one way and it stays on. Leave it in the middle and it is off. Push it the other way and it stays on only while you hold it, then springs back to off when you let go. That suits a 12V bilge pump panel, with auto one way and hold-for-manual the other, or a workshop machine with run one way and jog the other.
It is rated 20A at 30VDC, which covers most 12V and 24V panel loads, and 6A at 250VAC on New Zealand mains. The 15A printed on the case is for 125V supplies, so don't use that figure on 230V. It fits a 12.5mm panel hole, seals at the front of the panel with its O-ring, and wires up with standard 6.3mm push-on connectors.
Specifications
Datasheets
Wiring & getting started
- Drill the hole
Drill a 12.5mm hole in a panel up to 4mm thick. File one edge flat, 11.1mm from the far side of the hole, to match the flat on the thread so the switch can't turn. Leave room behind the panel for the 30 x 18mm body and the tabs.
- Mount it
Take off the hex nut and lockwasher and leave the O-ring on the switch. Push the thread through from behind, so the O-ring sits against the back of the panel, then fit the washer and nut on the front. Tighten to 1.47 Nm, a firm nip with a small spanner. The thread is brass, so don't overdo it.
- Wire the tabs
With the power off, put the supply on tab 2, the middle tab. Tab 3 feeds the load that stays on, and tab 1 feeds the load that runs only while you hold the lever. The numbers are on the switch. Use insulated 6.3mm female connectors, crimped well and pushed fully home, because a loose spade is the usual cause of a switch that runs hot or cuts out.
- Check it works
Before closing the panel, use a meter on continuity. One way, tabs 2 and 3 connect and the lever stays put. In the middle, nothing connects. The other way, tabs 2 and 1 connect, and the lever springs back to the middle when you let go.
Note: On 230V mains, turn the power off before working on it, switch the active wire, use fully insulated connectors and mount the switch in an enclosure. If you are not confident with mains wiring, have a qualified person fit it.