Starting in October 2017, there will be changes to the vinyl cording on the following families of film capacitors and spark quenchers:
S1, S2, SB
A list of all the affected products can be found here.
The vinyl cording used in the current products is being discontinued. Currently, this cording -- model numbers UL1007BIG and UL1015 -- is manufactured by Hanai Electric Wire Co., Ltd.
UL1007BIG will be manufactured by Tokyo Electric Wire Industrial Co., Ltd.
UL1015 will be manufactured by Sumitomo Electric Industries, Ltd.
A chart explaining the differences can be found here.
Are model numbers changing?
No. This change will have no effect on model numbers. Replacement parts will be used once stock for the current parts is gone.