Siemens 3RH2911-4HA01 Auxiliary Switch, 1 NC, Ring Lug Terminal Original Brand New

Overview

The Siemens 3RH2911-4HA01 is a reliable, instantaneous front-mounted auxiliary switch block designed as an accessory for the SIRIUS series of industrial control gear. This unit features a single Normally Closed (1 NC) contact configuration and is specifically equipped with a robust ring cable lug connection for secure, high-vibration applications. It is an essential component for expanding the signaling and interlocking capabilities of your Siemens control systems.

Technical Specifications / Key Features

• Product Number: 3RH2911-4HA01
• Brand: Siemens SIRIUS
• Type: Auxiliary Switch Block (Instantaneous)
• Mounting Location: Front-mount (Clip-on)
• Contact Configuration: 1 NC (Normally Closed)
• Contact Numbering: .1/.2
• Terminal Type: Ring Cable Lug Connection
• Compatibility: Designed for use with SIRIUS 3RT2 Contactors and SIRIUS 3RH2 Contactor Relays.
• Function: Provides additional signaling, interlock, and control circuit functionality.

Benefit

• Enhanced System Control: Easily adds an instantaneous Normally Closed signaling contact for monitoring or interlocking functions within control circuits.
• High Reliability: As a genuine Siemens SIRIUS component, it ensures seamless integration and reliable operation within compatible contactor and relay systems.
• Secure Connection: The Ring Cable Lug Connection is ideal for environments where high vibration or stringent connection security is required, offering a more permanent and dependable electrical connection than standard screw terminals.
• Simple Installation: Designed for quick and easy front-clip-on mounting to the contactor or relay, minimizing installation time and effort.
• Seamless Integration: Perfectly matches the form factor and electrical specifications of the 3RT2 power contactors and 3RH2 contactor relays.

Function / Application

The 3RH2911-4HA01 auxiliary switch is used to provide feedback on the switching status of the main contactor or contactor relay.

1. Signaling: The NC contact can be wired to a PLC input or indicator lamp to signal when the main contactor is de-energized (i.e., the NC contact is closed).
2. Electrical Interlocking: It can be used in control circuits to ensure two contactors (e.g., in a reversing starter) cannot be simultaneously energized, enhancing safety and preventing equipment damage.
3. Self-Holding Circuits: Although an NC contact, it is a versatile component for complex control logic.

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