The Honeywell 958-2 is an overhead door contact that looks just like the 958 overhead door contact. However, there is a major difference between the (2) Honeywell contacts. While most hardwired alarm control panels and door contacts use normally closed circuits, some control panels require normally open circuits. The 958 is a standard normally closed contact while the 958-2 can be wired for a normally closed or a normally open loop. Unless your installation calls for a normally open contact, the 958 overhead door contact is a suitable option. However for those instances when you need a normally open contact, you should opt for the 958-2.
The 958-2 overhead door contact consists of a Form C, SPDT, normally open or normally closed reed switch contact and an adjustable magnet with an L bracket. The contact is rated for 100mA at 28VDC and is epoxy sealed to protect the internal reed switch from water or corrosion. Just like the 958, this overhead door contact has a rugged “Shock Absorber” design to protect the contact from damage resulting from impact. As you typically will install a 958-2 overhead door contact in a garage or warehouse, the “Shock Absorber” design will make sure your Honeywell contact lasts a long time. To further protect your Honeywell overhead door contact, the wire terminal leads are encased in an armored cable that extends out 24” from the actual contact. Install the 958-2 with confidence even in the toughest commercial applications.
The Honeywell 958-2 does not have the XTP transient protection against lightning strikes or power surges like the 959 XTP overhead door contact. If power surges are a concern, you should look at the 959 instead.
The 958-2 overhead door contact has a magnet spacing gap of 2.375”. Make sure when installing the contact, that the magnet and the contact are within 2.375” when the overhead door is closed. You can move the position of the magnet by simply unscrewing it and shifting it closer or further from the back of the L bracket to choose the ideal magnet location. You should install the L bracket and magnet to the actual overhead door and the 958-2 contact will need to get drilled into the floor of your garage or warehouse.