This is a NEW Siemens model ECSBPK06 generator interlock kit for Siemens load centers.The kit you will receive in picture #1 comes with instalation instructions.Pictures #4,5, and 6 show the kit installed over the breakers. The interlock kit will only allow one breaker on at a time.See picture #2 for a list of electrical boxes/load centers that this kit fits.We have also included pictures of the main breaker,see pictures 7 thur 10 of the "type QN main breaker" that should match the main breaker in your electrical box for this interlock kit to work properly.If your main breaker is NOT the type QN !!!! THIS KIT WILL NOT FIT!!!! See our other listings if you have a type EQ, QNR, QNRH or other type main breaker.Email your questions!!!Check our other auctions for breakers and electrical interlock kits for other load centers. Buyer pays actual shipping costs.Florida residents pay applicable state sales tax