3RH2911-1HA21
The Siemens SIRIUS 3RH2911-1HA21 is a front-mounted auxiliary switch with three sets of contacts: two normally open and one normally closed. It uses screw terminal connections and can be directly snapped onto the front of the 3RT2.1～3RT2.4 (S00～S3) contactors and the 3RH2 contact relay to expand the control signal points.
Product Positioning
The 3RH2911-1HA21 is a SIRIUS 3RH29 pre-positioned auxiliary switch. With a configuration of 2 normally open and 1 normally closed contacts, it supplements the contactor contacts and is suitable for motor control, status feedback and interlocking circuits. One model can be used with various sizes of 3RT2 contactors, making spare parts management simpler.
Core Product Advantages and Features
2 normally open and 1 normally closed configuration
It provides three sets of auxiliary contacts: two normally open and one normally closed, which can be precisely expanded according to the needs of the control circuit without wasting contacts.
Universal across sizes
Applicable to 3RT2.1～3RT2.4 (S00～S3) contactors and 3RH2 contact relays; spare parts can be shared.
Front-mounted snap-fit installation
It snaps directly onto the front of the contactor, requiring no tools for installation, allowing for quick maintenance and replacement, and reducing downtime.
Screw terminal secure
The screw terminals can connect to 0.5-2.5mm² wires, ensuring a secure connection and making them suitable for general control panel wiring.