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Are Key Interlocks or PROVISIONS only for a field installed key interlock, available for General Duty, Heavy Duty or Double Throw safety switch?

Issue:
Product design features

Product Line:
Safety Switches

Environment:
Key Interlocks

Cause:
Application

Resolution:
Square D does offer most Heavy Duty and Double Throw safety switches with FACTORY installed ONLY, key interlocks. However, Square D does NOT offer provisions for field installed key interlocks, they MUST be factory installed ONLY.
NOTES: 
1) Key interlocks are NOT available for the General Duty Safety Switch product line. 
2) Key interlocks are NOT available for the 600amp Double Throw Safety Switches, catalog numbers DTU326, DTU326R, DTU426, DTU426R, DTU366, DTU366R, DTU366AWK, DTU466 and DTU466R 
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