Product Description
Siemens 3RH2911-1HA12 Auxiliary Switch Block - 3-Pole Front Mount with 1NO/2NC Contacts
Model: 3RH2911-1HA12 | Brand: Siemens | Series: Sirius Auxiliary Switch Block
Product Overview
The Siemens 3RH2911-1HA12 is a three pole front mounted auxiliary switch block featuring 1 normally open (N.O.) and 2 normally closed (N.C.) contacts. This Siemens Sirius auxiliary switch comes with screw terminals and provides snap-on installation compatibility with Size S00, S0, and S2 contactors. The unit features a centrally positioned release lever for easy disassembly.
Key Features & Benefits
- Front Mounted Design: Easy access and visual status indication
- Snap-On Installation: Tool-free mounting on compatible contactors
- Central Release Lever: Easy disassembly and maintenance
- Screw Terminals: Secure and reliable wire connections
- Universal Compatibility: Works with S00, S0, and S2 contactor sizes
- Mixed Contact Configuration: 1 N.O. + 2 N.C. for versatile control
- EN 50011 Compliance: Meets international standards
- Coded Design: Prevents incorrect installation
Technical Specifications
Contact Configuration
| Number of Poles: | 3 |
| Normally Open Contacts: | 1 (N.O.) |
| Normally Closed Contacts: | 2 (N.C.) |
| Contact Configuration: | 1 N.O. + 2 N.C. |
Physical & Installation Specifications
| Mounting Type: | Front Mounted |
| Terminal Type: | Screw Terminals |
| Installation Method: | Snap-on to contactor front |
| Release Mechanism: | Central positioned release lever |
| Quantity per Contactor: | One 3RH2911-1HA12 maximum |
Contactor Compatibility
The 3RH2911-1HA12 auxiliary switch block is compatible with the following Siemens Sirius contactor series:
| Contactor Size | Compatible Models | Model Range |
|---|---|---|
| Size S00 | 3RT2015 through 3RT2018 | 3RT2015, 3RT2016, 3RT2017, 3RT2018 |
| Size S0 | 3RT2023 through 3RT2028 | 3RT2023, 3RT2024, 3RT2025, 3RT2026, 3RT2027, 3RT2028 |
| Size S2 | 3RT2035 through 3RT2038 | 3RT2035, 3RT2036, 3RT2037, 3RT2038 |
Installation Guidelines
- Maximum Installation: Only one 3RH2911-1HA12 auxiliary can be installed per contactor
- Additional Options: Two and four pole auxiliary switch blocks are also available
- Installation Method: Easily snaps onto the front of compatible contactors
- Removal: Use centrally positioned release lever for disassembly
EN 50011 Compliance & Technical Details
EN 50011 Standard Compliance
The auxiliary switch block meets EN 50011 standards for contactor relays:
- 4-Contact Base Configuration: Contactor relays with identification number 40E
- Extended Configurations: Can be extended with 80E to 44E auxiliary switch blocks
- 8-Contact Systems: Extended systems obtain 8 contacts according to EN 50011
- Identification Numbers: 80E to 44E apply to complete contactors
Compatibility Restrictions
Important: These auxiliary switch blocks (3RH2911-1GA..) cannot be combined with contactor relays having identification numbers 31E and 22E as they are specifically coded for compatibility.
Alternative Configurations
For different contact requirements:
- EN 50005 Compliance: All 4-contact contactor relays (40E to 22E) can be extended
- Extended Contact Options: Auxiliary switch blocks 40 to 02 available
- Final Configurations: Achieve 6 or 8 contacts in accordance with EN 50005
- Identification Scope: Numbers apply only to attached auxiliary switch blocks
Applications
The Siemens 3RH2911-1HA12 auxiliary switch block is ideal for:
- Motor control circuit interlocking
- Status indication and monitoring
- Control circuit switching
- Safety interlocking systems
- Process automation control
- Industrial machinery control panels
- HVAC system control
- Pump and fan control systems
- Conveyor control systems
- Manufacturing process control
Why Choose Siemens 3RH2911-1HA12?
- Siemens Quality: Proven reliability and durability
- Easy Installation: Snap-on design with central release lever
- Wide Compatibility: Works with S00, S0, and S2 contactor sizes
- Standard Compliant: Meets EN 50011 international standards
- Secure Connections: Screw terminals for reliable wiring
- Front Access: Easy maintenance and status monitoring
- Coded Safety: Prevents incorrect installation combinations
- Professional Grade: Designed for industrial applications
Quick Reference
| Full Model Number: | 3RH2911-1HA12 |
| Series: | Siemens Sirius Auxiliary Switch Block |
| Type: | 3-Pole Front Mounted Auxiliary Switch Block |
| Contact Configuration: | 1 N.O. + 2 N.C. |
| Compatible Sizes: | S00 (3RT2015-3RT2018), S0 (3RT2023-3RT2028), S2 (3RT2035-3RT2038) |
| Mounting: | Front Mounted, Snap-on Installation |
| Terminals: | Screw Terminals |
| Standard Compliance: | EN 50011 |
| Installation Limit: | One per contactor (additional 2 & 4 pole available) |
