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

Siemens 3SB3400-0A is an actuator-/indicator component: a front-plate mounted contact block with two contacts configured as 1 normally open (NO) and 1 normally closed (NC), wired through screw terminals. Designed for front-plate mounting, it pairs with Siemens 3SB3 pushbuttons and related signaling devices to add a compact two-contact auxiliary channel in control panels. It is rated for insulation voltage up to 400 V and supports a thermal current of 10 A, with an impulse voltage withstand of 4 kV, making it suitable for standard signaling and interlock circuits in industrial equipment. The two contact elements in a single module provide NO/NC signaling without the need for a separate relay, and the screw-terminal connections offer secure, durable wiring in harsh environments when used with compatible front-plate assemblies. Typical applications include signaling, status indication, and interlocking in machine control panels, where a compact auxiliary contact block is required for Siemens 3SB/SIRIUS signaling devices.