Model NSD-200 fits Square D "QO" and Homeline series 150 and 200 amp breaker panels that have a single centered horizontal main breaker (Left OFF, Right ON) and 1 3/8" cutout spacing between main and branch breakers. All of our interlocks kits work perfectly with top OR bottom mounted main breakers.
 
All  GenSafety generator breaker interlock kits are Made in the USA and are very high quality. They are CNC machined from T-6061 aluminum and are then color anodized to prevent corrosion and provide smooth operation for life.
 
The kits include everything you need to complete the installation including a correct size high quality drill bit, name brand thread locking compound, all warning labels and placards, a breaker retention strap, and clear illustrated installation instructions.
 
Once you use an interlock kit from GenSafety you won't want to use anything else!
 
Made in the USA!
 
Please see the attached illustrations to insure you have selected the correct kit for your panel. Please call or text us if you have any questions or don't see a kit for your panel.