For Ite, Gould, Thomas, And Betts 150 Or 200 Amp Box Transfer-Switch, Siemens ?UL Tested?CZNZN generator interlock kit has already passed the UL test and got the test report, the manual interlock switch kit allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages. ?Compatible Models?CZNZN interlock breaker kit compatible with vertical main ITE, Gould, Murray, Siemens, and Thomas and Betts 150 or 200 amp main load center panel box. Apply to 1-1/4 inches interval spacing between main and generator branch breaker, other same space panels may fit. Fit indoor/outdoor generator. Mounts on front of breaker panel, no need extra control box or wiring ?Great Tool for Conversion Power?Generator lockout kit "Lock position" by sliding the lock plate up and down, easy to switch generator/solar power from utility or connect with a generator to power up all of your home electrical appliances, clearly indicating what you are running when protecting your generator. Stay away from darkness and coldness when power off ?High Quality and Reusable?Interlock switch plates are made of chemical resistant, extra thick solid high quality aluminum alloy, durable for long term use. With chamfering and surface oxidation treatment, generator interlock kit will keep fashion look and smooth surface protect user hand ?Items Included Warranty?Recommend to operate by licensed electricians. Easy to install, Package includes everything you need. 2 Interlock plate, 3 Step screws and nuts, 1 Drill Bit, 1 Generator Start-Up Procedure Label, 5 Remind Label, 2 Zip Ties, 2Removable Dots Glue, 1 Installation instruction. Free risk on lifetime warranty. Pls contact us if the interlock kit do not suitable or you need any help