FREQUENTLY ASKED QUESTIONS

Nascom offers several solutions. Rail Mount: The N505ASCD/ST is designed specifically for this application. The N505AU/ST universal mount flip switch is also a good choice as you can mount on either side of the door and have the cable exit the switch in the preferred direction. The magnet actuator for both modes mounts directly on the door. If the upper door stop clearance is a problem that will prevent the magnet actuator from passing under the stop or if the flange on the bottom of the door will interfere with the switch mount then we would recommend using one of the following floor mount models, N200AU/ST mini universal floor mount, N205AU/ST or N205A/ST. All of the above listed contacts feature No Dead Spot technology that helps prevent false alarms do to movement in these types of doors.

Residential and commercial overhead doors.

Nascom offers several solutions. For floor mount and top of door mount, the N205AU/ST is the wide gap version with universal mount magnet as well as the N205A/ST featuring an adjustable bracket mounted magnet, both models will retro fit on the same footprint as our competitors, similar models. Nascom also offers the mini N200AU/ST with up to 2” gap. The N200AU/ST is popular for industrial man doors and roof hatches as well as in ground access covers and manhole covers.

For concealment in the floor our NDB400A/ST and NDB400AU/ST are direct burial models. Rail mounting use our N505AUTM/ST for 2-¼" residential track and our N505AUTMC/ST for commercial track. Both model series use the N505 Universal mount Flip Switch so no matter which side of the door you mount the switch on you can remove the switch from the bracket and flip it, so the cable comes out the preferred direction. This feature is handy when used on double doors where you want both switches in the center and the cablerunning to a common connection point.

Although this Website may be linked to other websites, we are not, directly or indirectly, implying any approval, association, sponsorship, endorsement, or affiliation with any linked website, unless specifically stated herein.

You should carefully review the legal statements and other conditions of use of any website which you access through a link from this Website. Your linking to any other off-site pages or other websites is at your own risk.

These are contact arrangements that can be found on switches and relays.

Form A: is a single, normally open contact that closes upon actuation when the magnet actuator is in proximity of the switch.

Form B: is the same as A except in reverse. A form B is normally closed contact that opens upon actuation when the magnet actuator is in proximity of the switch.

Form C: is a form A contact connected to a form B contact. The form C contact has 3 wire leads, NO (normally open), NC (normally closed) and C (common). Upon actuation when the magnet actuator is in proximity of the switch, the NO (normally open) contact closes (continuity from NO-C) and the NC contact opens (no continuity from NC-C).

It is more common to see the following designations:

Form A and B can also be referred to as Single Pole- Single Throw Contacts:

SPST-NO (Closed Loop) = Form A

SPST-NC (Open Loop) = Form B

Form C can be referred to as Single Pole Double Throw:

SPDT = Form C