What This Part Is
The Siemens 3RT5955-5AF31 is a SIRIUS-brand withdrawable magnet coil designed for the S6 contactor frame size. It accepts a control supply voltage of 127 V, rated identically at 50 Hz, 60 Hz, and DC, with an AC/DC input type — meaning one coil handles both supply types without a rectifier module.
What the Ratings Mean for Fit
The 127 V AC/DC rating is the critical spec for replacement: if your panel's control transformer or DC supply bus is 127 V nominal, this coil pulls in and holds on that rail. The AC/DC designation means it works on a 127 V AC line (50 or 60 Hz) or a 127 V DC bus without needing a separate coil variant — useful when a site has mixed control power sources or is migrating from AC to DC control.
Deployment Context
As a withdrawable coil for the S6 contactor frame, it mounts into the contactor's coil terminals, which sit on a DIN-rail-mounted panel. The withdrawable design lets you swap the coil without removing the contactor from the rail — useful when changing control voltage during commissioning or retrofit.