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What is the difference between LAD9R1 mechanical interlock kit and LADT9R1 mechanical interlock kit? Do they both use the same interlock?

Are the LAD9R1 and LADT9R1 interchangable? 

Product Line: 
Tesys D line accessories

Products sold and used in the United States
The difference is that the LADT9R1 (for 4 pole contactors) is going to have a 4 pole bus (bottom piece power connection only with a total of 8 pins) where the LAD9R1 (for 3 pole contactors) has a 3 pole bus (top and bottom power connections with each having 6 pins). The LAD9V2 interlock is used on both devices.

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