3RH2911-1BA01
The Siemens SIRIUS 3RH2911-1BA01 is a single-pole front-mounted auxiliary switch with one normally closed (1 NC) contact, terminal markings 71/72, bottom entry, screw terminal connection, and can be snapped onto the front of the 3RT2 contactor and 3RH2 contact relay to expand single-point control signals.
Product Positioning
The 3RH2911-1BA01 is a SIRIUS 3RH29 single-pole auxiliary switch. It can be installed independently when only a normally closed signal needs to be added. The bottom-entry design makes it easy to select according to the wiring direction inside the panel, and it is suitable for flexible expansion of small control circuits.
Core Product Advantages and Features
Unipolar elastic expansion
A single normally closed contact module can be added point by point as needed, eliminating the need to purchase a complete set of multi-pole auxiliary switches.
Bottom cable entry design
The wires are introduced into the terminals from below, and the placement of the wire trough can shorten the wiring and keep the panel tidy.
Front-mounted snap-fit installation
It snaps directly onto the front of the 3RT2 contactor or 3RH2 contact relay for quick, tool-free installation.
Screw terminal secure
The screw terminals can connect to 0.5 to 2.5 mm² wires, making them suitable for vibration environments and traditional wiring practices.