Siemens SIRIUS 3RH2911-4GA22 Front Auxiliary Switch, 2 NO + 2 NC, Ring Cable Lug Connection for 3RH2 Contactor Relays Original Brand New

Overview

The Siemens SIRIUS 3RH2911-4GA22 is a high-performance, front-mounted auxiliary switch block designed specifically to expand the contact capabilities of compatible Siemens SIRIUS 3RH2 Contactor Relays in the size S00 series. This instantaneous switch is an indispensable component in complex control and signaling circuits, providing an additional 2 Normally Open (NO) and 2 Normally Closed (NC) contacts for robust and reliable switching operations. It features a specialized ring cable lug connection for secure and permanent wiring, making it ideal for high-vibration or heavy-duty industrial environments.

Key Features and Specification

• Product ID: 3RH2911-4GA22
• Manufacturer: Siemens
• Product Series: SIRIUS 3RH29 (Auxiliary Switches)
• Mounting Type: Front-side, snap-on mounting (tool-free)
• Contact Configuration: 4-pole: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Contact Numbering: 53/54, 61/62, 71/72, 83/84
• Current Path Arrangement: 1 NO, 1 NC, 1 NC, 1 NO
• Connection Type: Ring Cable Lug Connection
• Coding: Physically coded for error-free mounting.
• Compatibility: Only combinable with Siemens Contactor Relays 3RH2140 and 3RH2442 (in accordance with EN 50011).
• Size: S00
• Rated Insulation Voltage (AC): $690V$ (with degree of pollution 3)
• Typical Mechanical Service Life: $10,000,000$ operating cycles

Function

The 3RH2911-4GA22 auxiliary switch serves to instantaneously signal the operating status of the main contactor relay. By snapping onto the front face of the base unit (like the 3RH2140 or 3RH2442), it mechanically links to the contactor’s movement. When the coil is energized:

1. The two Normally Open (NO) contacts close (53-54, 83-84).
2. The two Normally Closed (NC) contacts open (61-62, 71-72).

This allows for the simple and effective implementation of interlocking, signaling, monitoring, and holding circuits in electrical control systems.

Benefit

• Enhanced Circuit Flexibility: Easily adds four auxiliary contacts to a compatible contactor relay, expanding control possibilities without changing the main device.
• High Reliability: The robust design and high mechanical service life ensure long-term, dependable operation in demanding industrial applications.
• Secure Wiring: The ring cable lug connection provides an extremely secure and vibration-resistant electrical connection, reducing maintenance and downtime.
• Quick Installation: The front snap-on mounting allows for tool-free, rapid assembly and disassembly.
• Error Prevention: Physical coding ensures the auxiliary switch is mounted correctly and is compatible with the correct base unit (3RH2140 or 3RH2442), preventing potential wiring errors.
• Global Standard Compliance: Manufactured by Siemens and compliant with standards like EN 50011.

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