Siemens 3RH2911-1DA11 Auxiliary Contact Block

Siemens 3RH2911-1DA11 is a lateral auxiliary contact block for SIRIUS contactors, providing one normally open (NO) and one normally closed (NC) contact in a compact side-mount module that attaches to the 3RT2.1 series main contactor. It uses screw terminals and supports side mounting on either the left or right of the main unit, with left-side terminals 41/42 and 53/54 and right-side terminals 21/22 and 33/34, delivering a dual-contact path (1 NC, 1 NO). The block is rated for a 240 V load at up to 10 A and is designed to extend control circuits without occupying the main power contacts. Compatible with Siemens SIRIUS 3RT2 contactors (and related 3RH2/3RH1 relays), this auxiliary switch block enables straightforward signaling, interlock, and status indications in motor control panels and automation cabinets. As a Siemens accessory, it maintains compatible terminal pitch with the main unit and integrates with standard control wiring practices for reliable operation in space-constrained installations.