The Siemens 3VA9473-0QA00 is a nut keeper kit supplied as 3 units, one per pole of a three-pole SENTRON 3VA molded case circuit breaker. It holds the connection nut captive in the terminal so the nut cannot fall out or rotate while a busbar or cable lug is being bolted on.

Keeping the nut located makes the flat screw connection possible to make single-handed and repeatable, which shortens assembly time in a crowded panel and reduces the risk of hardware being dropped into live gear during maintenance.

Siemens lists it as an accessory for 3VA53/53 and 3VA63/64. Supplied with a net weight of 0.164 kg in a 170 x 120 x 5 mm pack.