Siemens SIRIUS 3RH2921-4DA11 Lateral Auxiliary Switch Block 1 NO + 1 NC, Ring Cable Lug Connection Original Brand New

Overview: Siemens SIRIUS 3RH2921-4DA11 Auxiliary Switch

The Siemens 3RH2921-4DA11 is a high-quality lateral auxiliary switch block from the SIRIUS modular system, specifically designed for expanding the number of auxiliary contacts on Siemens 3RT2 power contactors and 3RH2 contactor relays. This critical component ensures reliable signalization and control circuit functionality in various industrial automation applications.

This switch features a configuration of 1 Normally Open (NO) and 1 Normally Closed (NC) instantaneous contact and utilizes robust ring cable lug connection terminals, ideal for applications requiring secure, screw-down connections. The lateral (side) mounting design allows for tool-free, snap-on installation, making it a simple and efficient way to upgrade your control circuits.

Benefit

• Enhanced Control: Adds an essential 1 NO and 1 NC signaling circuit to your main contactor or relay, expanding your control and monitoring capabilities.
• Superior Reliability: Designed by Siemens SIRIUS for long mechanical and electrical service life (10,000,000 / 200,000 operating cycles, typical).
• Easy Installation: Features a tool-free, lateral snap-on mounting system, reducing installation time and effort.
• Secure Connection: Ring cable lug connection terminals provide a highly robust and vibration-resistant electrical connection, ideal for demanding industrial environments.
• Compact Design: The lateral mounting position maintains the narrow width of the primary device, optimizing cabinet space.

Application

The 3RH2921-4DA11 auxiliary contact block is typically used in the control circuits of industrial machinery and equipment for tasks such as:

1. Status Indication: Providing an auxiliary signal (NO or NC) to a PLC (Programmable Logic Controller) or indicator lamp to confirm the contactor/relay’s switching status.
2. Interlocking: Implementing electrical interlocking schemes to prevent simultaneous operation of two conflicting contactors (e.g., in a reversing starter).
3. Hold Circuits: Creating self-holding circuits or complex control logic.

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