Siemens SIRIUS 3RH2911-4HA21 Auxiliary Switch Block, Front-Mount, 2 NO + 1 NC, Ring Cable Lug Original Brand New

Overview: Reliable Auxiliary Control for SIRIUS Contactors

The Siemens SIRIUS 3RH2911-4HA21 Auxiliary Switch Block is a crucial accessory for extending the functionality of your SIRIUS 3RT2 power contactors and 3RH2 contactor relays. Designed for fast and secure front-mounting (clip-on), this switch immediately enhances the monitoring and control capabilities of your industrial applications.

It features a robust 3-pole contact configuration: 2 Normally Open (NO) and 1 Normally Closed (NC), providing the essential feedback signals needed for control circuits, interlocking, and status indication. The unique Ring Cable Lug connection is ideal for applications requiring secure, high-vibration resistant wiring.

Benefit

1. Enhanced Reliability: Provides dependable instantaneous switching for crucial control and signaling functions within motor starting and control applications.
2. Secure Wiring: The Ring Cable Lug terminal ensures an extremely secure and low-maintenance connection, perfect for high-vibration environments or applications where wire pull-out prevention is critical.
3. Fast Integration (Clip-on): Designed for quick, tool-free snap-on mounting directly onto the front of the compatible contactor, saving time during installation and maintenance.
4. SIRIUS System Compatibility: Seamlessly integrates into the comprehensive Siemens SIRIUS modular system, guaranteeing perfect fit and function with 3RT2 and 3RH2 devices.

Function & Application

This instantaneous auxiliary switch is used to provide secondary electrical circuits with switching signals that reflect the current state (ON/OFF) of the main contactor.

• Signaling: Lights and indicators for local and remote status monitoring.
• Interlocking: Creating safety or logic circuits to prevent incorrect or simultaneous operation of multiple components.
• Control Loop Feedback: Providing necessary feedback to PLCs or control systems.

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