Siemens 3RH2911-1FA04 Auxiliary Switch Block, 4 NO Contacts, Front-Mounted for 3RT2 and 3RH2 Contactors

The Siemens 3RH2911-1FA04 auxiliary switch block is a high-quality electrical component designed to extend the functionality of industrial contactors. This front-mounted module is specifically engineered for seamless integration with Siemens 3RT2.1, 3RT2.2, 3RH21, and 3RH24 contactors in the S00 size category. By providing four additional normally open (NO) contacts, it allows for more complex control logic and signal feedback within automation systems and electrical control panels.

Advantages

This auxiliary switch block offers exceptional reliability and precision in signal transmission, ensuring that your control circuits operate consistently under various industrial conditions. Its front-mounted design facilitates quick and efficient installation, saving valuable time during panel assembly or maintenance. The robust construction meets rigorous industrial standards, providing long-term durability and stable performance in demanding environments. Furthermore, the compact design ensures that it does not unnecessarily increase the footprint of your contactor assembly, making it an ideal choice for space-constrained electrical cabinets.

Suitable for

• Industrial automation and control systems
• Expansion of switching capacity for contactors
• Signal feedback loops in electrical panels
• Integration with S00 size contactors

When it may not be suitable

This switch block is not compatible with contactors outside of the specified S00 size range or non-compatible series. It should not be used in applications requiring normally closed (NC) contacts, as this specific model is equipped exclusively with four normally open (NO) contacts.

Key specifications

• Contact configuration: 4 normally open (NO) contacts
• Mounting type: Front-mounted
• Compatibility: Siemens 3RT2.1, 3RT2.2, 3RH21, and 3RH24 contactors
• Size category: S00

How to use

To install the auxiliary switch block, ensure that the main contactor is disconnected from the power supply. Align the module with the front interface of the compatible S00 contactor and press it firmly until it clicks into place. Once secured, connect the necessary control wiring to the terminals according to your circuit diagram. Verify that all connections are tight and that the module is properly seated before restoring power to the system.

What to consider before purchase

• Verify the size and series of your existing contactor
• Confirm that your control logic requires four normally open contacts
• Ensure there is sufficient physical space on the front of the contactor for mounting

Usage recommendations: Always perform a functional test of the control circuit after installation to ensure that the auxiliary contacts actuate correctly in synchronization with the main contactor.