Siemens 3SB3403-0M is a front-plate mounted contact block for the SIRIUS ACT 3SB3 signaling devices, delivering a normally closed (NC) contact with mounting-monitoring capability. It uses spring-type terminals and requires a mounting depth of 63 mm when installed on the front plate. This 0M variant is designed to extend control circuits with an NC contact, suitable for interlocks and feedback paths in automated machinery. Part of Siemens’ modular signaling family, the 3SB3403-0M accompanies compatible operators for compact, field-replaceable control components.
