Siemens SIRIUS 3RH2911-4NF20 Front Auxiliary Switch Block, 2NO, Solid-State Compatible, Ring Lug Terminal Original Brand New

Product Overview: Siemens SIRIUS 3RH2911-4NF20 Auxiliary Switch

The Siemens 3RH2911-4NF20 is a high-performance, front-mounted auxiliary switch block from the robust SIRIUS modular system. This auxiliary switch is designed to easily expand the number of auxiliary contacts on Siemens 3RT2 power contactors and 3RH2 contactor relays, providing reliable signal output for your control circuits.

This specific model is engineered for modern control systems, offering Solid-State Compatibility, which ensures reliable switching even at low voltages and currents (5V, 1mA) typical of PLC inputs. Its user-friendly snap-on mounting allows for tool-free, front-side installation, regardless of the contactor size (S00, S0, S2, S3).

Benefit

• PLC/Solid-State Reliability: Designed for low-power signaling, ensuring error-free communication with sensitive control devices like PLCs, often where standard contacts would fail.
• Secure Connection: The ring cable lug connection provides a highly secure and vibration-resistant electrical connection, ideal for harsh industrial environments.
• Quick Installation: Features tool-free, snap-on front mounting to significantly reduce installation and maintenance time on compatible contactors.
• Versatile Application: Suitable for use across multiple contactor sizes (S00, S0, S2, S3) within the SIRIUS modular system, simplifying inventory management.
• High Durability: Offers a mechanical service life of 5 million operating cycles, guaranteeing long-term, reliable performance.

Function

The 3RH2911-4NF20 Auxiliary Switch serves to expand the control-side signaling capabilities of your main power contactor or contactor relay. When the main contactor is actuated (opened or closed), the instantaneous 2 NO contacts on this block change state simultaneously.

Application:

• Status Signaling: Providing a positive confirmation signal to a PLC or control system that the main contactor has closed.
• Interlocking: Creating logical conditions in a control circuit, such as ensuring one device is off before another can be started.
• Indicator Lights: Operating indicator lights to show the operational status (e.g., Run/Stop) of the connected machine.

Note: This product is a component of the SIRIUS modular system, simplifying planning and assembly of industrial control panels.

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