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What is the difference between the 9421LW1 and the 9421LW4 kits for the PowerPact M and P frame breakers?

Issue:
What is the difference between the 9421LW1 and the 9421LW4 kits for the PowerPact M and P frame breakers?

Product Line:
Class 9421 Circuit Breaker Operational Mechanism, Powerpact M and P Frame 
 
Environment:
Products sold in Norh America

Resolution:
9421LW1 = 9421LW7 (opmech) + 9421LS8 (short shaft) + 9421LHP8 (handle)
9421LW4 = 9421LW7 (opmech) + 9421LS10 (long shaft) + 9421LHP8 (handle)

Item  Description
1 Operating mechanism
2 Handle assembly
3 Shaft
4 Shaft support bracket
5 Screw, #10-32 x 4-1/2
6 Screw, 1/4-20 x 1/2
7 Washer, 1/4
8 Screw, #8-32 x 3/8
9 Hex-head screw, 1/4-20 x 7/8
10 Lock washer, 1/4
11 Nut, 1/4-20
12 Hex-head screw, 1/4-20 x 1/2 (self-tapping)
13 Screw, 1/4-20 x 3/4 (self-tapping)
14 Handle gasket
A Interlock pin location
B Actuator
C Circuit breaker
D Enclosure door
E Panel
H Mounting depth
L Shaft length
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