The Siemens 3RH2911-1DA11 is a side-mount auxiliary switch block designed to expand the switching and signaling capability of compatible Siemens 3RH2 and 3RT2 series contactors and motor starters. Featuring a 1 Normally Open (1NO) and 1 Normally Closed (1NC) contact configuration, this auxiliary switch mounts directly to the side of the base contactor without the need for additional wiring harnesses, providing a clean, space-saving installation.
Built to Siemens’ exacting industrial standards, the 3RH2911-1DA11 is ideal for HVAC control panels, motor control centers, and building automation applications where reliable status feedback and interlocking circuits are required.
Key Features
- Side-mount design for direct attachment to Siemens 3RH2 and 3RT2 series contactors
- 1NO / 1NC contact configuration for versatile control and signaling circuits
- Snap-on installation — no additional tools or wiring harnesses required
- Compact form factor preserves panel space
- Suitable for use in HVAC control panels, motor control centers, and building automation systems
- Manufactured to Siemens industrial quality standards
Specifications
- SKU / Part Number: 3RH2911-1DA11
- Brand: Siemens
- Contact Configuration: 1NO + 1NC (1 Normally Open, 1 Normally Closed)
- Mounting Style: Side Mount
- Compatible Series: Siemens 3RH2 and 3RT2 Contactors / Starters
Applications
- HVAC motor control and protection circuits
- Motor control centers (MCC)
- Building automation and control panels
- Interlocking and status signaling circuits
- Industrial control systems requiring auxiliary contact expansion
