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Can I use Series B heater packs in Series A C306 overload relays?

You can use series B heater packs in series A C306 overload relays if you use the C306KAL1-3B lug adaptor kit.

These kits are used in conjunction with Catalog Numbers H2001B–H2014B or H2101B–H2114B heater packs as a means of utilizing these Series B heater packs in Catalog Numbers C306DN3 and C306GN3 Series Al overload relays. The kit consists of three lug adapters and installation instructions.