Siemens SIRIUS 3RH2921-1XA11-0MS0 Front-Mount Auxiliary Switch Block, 1 NO + 1 NC, Screw Terminal, Custom Contact Force 0.5N Original Brand New

Overview

The Siemens SIRIUS 3RH2921-1XA11-0MS0 is a specialized, front-mountable auxiliary switch block designed to expand the control and signaling capabilities of specific Siemens SIRIUS power contactors. This high-reliability contact block provides a combination of one Normally Open (1 NO) and one Normally Closed (1 NC) instantaneous auxiliary contact for use in various industrial control circuits. It is engineered for a customer-specific application, featuring a precise $0.5\text{ N}$ contact force to ensure reliable switching performance.

Benefit

• Enhanced Control Functionality: Easily adds a critical 1 NO and 1 NC signaling circuit to your main contactor, simplifying control logic implementation (e.g., status feedback, interlocking).
• Reliable Performance: A genuine Siemens SIRIUS accessory, ensuring seamless integration and consistent, long-term operational reliability within your industrial control panel.
• Precise Application Fit: The customer-specific $0.5\text{ N}$ contact force ensures the auxiliary switch operates correctly in niche or low-power control applications where standard contact forces may be too high.
• Simple Installation: Designed for quick and easy front mounting onto compatible contactors, minimizing installation time and effort.

Function

The 3RH2921-1XA11-0MS0 serves as an auxiliary contact module for 3RT202, 3RT203, and 3RT204 size power contactors. When the main contactor is actuated (coil energized), the auxiliary contacts switch states instantly:

• The 1 NO contact (33/34) closes, typically used for signaling that the main power circuit is engaged or for latching circuits.
• The 1 NC contact (41/42) opens, typically used for safety interlocks, signaling that the main power circuit is disengaged, or for preventing simultaneous operation of conflicting equipment.

The specialized, low contact force is crucial for applications requiring very precise contact pressure for signal integrity.

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