Siemens 3SB3400-0A Contact Block W 2 Contact Elements

The Siemens 3SB3400-0A is an actuator-/indicator component that functions as a two-contact auxiliary block for Signum 3SB3 front-plate pushbutton assemblies, delivering one normally open and one normally closed contact through a screw-terminal connection. Designed for front-plate mounting, it adds signaling capability to a control station without occupying a separate relay block. Key specifications include insulation voltage rated to 400 V, impulse voltage withstand of 4 kV, and a thermal current rating of 10 A. The contact configuration is 1 NO + 1 NC, enabling feedback or indication circuits alongside standard actuation. It is suitable for AC or DC operation within its rated range, compatible with Siemens 3SB3 modular units, and intended for integration into industrial control panels where compact auxiliary contacts are required. The block uses a straightforward screw-terminal interface for reliable, vibration-tolerant connections and aligns with front-plate mounting conventions for easy field installation through compatible enclosures and operator interfaces.