Generator Interlock Kit Compatible with Siemens,ITE,Gould,Murray,and Thomas and Betts,150 or 200 amp panels.for Siemens 150 amp panels. Compatible with Siemens 150 amp panels.Look out：incompatible Siemens 200 amp panels. Interval Space Required：1 1/4 Inch Spacing Between Main Circuit Breaker and Generator Circuit Breaker Installation Note: Before installing the interlocking kit, Attach the screws to the interlock kit first. Let's simulate the use of the test, so that we can better align the installation position, to avoid errors in the installation position, resulting in failure to use. Package：Our Generator Interlock kit include 1 × Interlock plate, 3 × Screws kit, 1 × Drill Bit, 1 × Instruction Bulletin, 2 × Generator Start-Up Procedure Label, 8 × Remind Label, 2 × Zip Ties. Generator Interlock Kit Compatible with Siemens,ITE,Gould,Murray,and Thomas and Betts,150 or 200 amp panels.for Siemens 150 amp panels.