Siemens 3RH2911-4DA11 Auxiliary Switch, 1 NO + 1 NC, Lateral Mount for 3RT2.1 Contactors Original Brand New

Overview: Siemens 3RH2911-4DA11 Auxiliary Switch

The Siemens 3RH2911-4DA11 is a high-quality, lateral-mounting auxiliary switch designed to expand the functionality of Siemens 3RT2.1 series contactors. This essential component allows for the creation of additional control circuits, providing critical feedback and interlocking capabilities for your industrial applications. With its robust design and reliable performance, the 3RH2911-4DA11 ensures seamless integration and operation within complex control systems.

Key Features & Benefit

• Expanded Functionality: Adds two independent control circuits (one Normally Open (NO) and one Normally Closed (NC)) to your contactor, enabling advanced control logic and signaling.
• Lateral Mounting: Designed for easy, space-saving installation on the side of the 3RT2.1 contactor, maintaining a compact footprint within your control panel.
• Ring Cable Lug Connection: Features a secure and reliable connection method, ensuring a stable electrical connection even in high-vibration environments.
• High Reliability: Engineered to the highest Siemens standards, this auxiliary switch provides consistent and long-lasting performance, reducing downtime and maintenance costs.
• Seamless Compatibility: Specifically designed for perfect integration with the Siemens 3RT2.1 contactor series, guaranteeing a perfect fit and dependable operation.

Function

The Siemens 3RH2911-4DA11 auxiliary switch operates in conjunction with a main contactor. When the contactor’s coil is energized, the auxiliary switch’s contacts change state simultaneously.

• The Normally Open (NO) contact closes when the main contactor is energized. This is commonly used for:
  • Signaling that a motor or load has been activated (e.g., turning on an indicator light).
  • Providing a holding path for a control circuit (e.g., a “seal-in” circuit).
• The Normally Closed (NC) contact opens when the main contactor is energized. This is often used for:
  • Interlocking other components to prevent simultaneous operation (e.g., ensuring a fan is off before a heater turns on).
  • Sending a signal that the main contactor has been de-energized.

Technical Specification

• Product Type: Auxiliary Switch
• Mounting: Lateral, side mount
• Number of Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Current Path: 1 NC, 1 NO
• Terminal Designation:
  • Left: 41/42 (NC), 53/54 (NO)
  • Right: 21/22 (NC), 33/34 (NO)
• Connection Type: Ring Cable Lug
• Compatibility: Designed for use with Siemens 3RT2.1 contactors

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