Is a wiring harness required when installing the MX shunt trip accessory into a Powerpact H, J or L Frame breaker?
Powerpact H, J and L Frame Circuit Breakers
For Powerpact H, J and L Frame breakers, the MX Shunt Trip accessory itself includes 2 screw terminals, to which wires are attached for control power. The MX Shunt Trip kit does not include the wires. The installer can supply the wires separately, or they can use the optional MX Shunt Trip wire harness kit available from Square D. The MX wire harness kit is catalog number S434504, and includes a harness of 2 wires of 20 inch length each. See the attached document 48940-229-01.
While the MX wire harness can be used with unit mount breakers, it is especially helpful when used with I-line versions of the breaker. See FA228476 for more details.