What is a D20AFN module and can it go in a normal Sensor Rack

Explanation

The D20AFN module is a 6kW Single Neutral Disconnect Module. These modules are normally installed in racks that have individual neutral landings running parallel to the hot landings, so when you flip the breaker for a circuit it addresses both the hot and neutral (for regular racks, you are just flipping for hot).

You can install a D20AFN module in a regular rack that has all neutrals tied to the back of the rack, you will just lose that combined control with the module breaker.