Siemens 3RH2916-1XA22-0MA0 Auxiliary Switch Block, 2 NO + 2 NC, Front Mount Original Brand New

Overview

The Siemens SIRIUS 3RH2916-1XA22-0MA0 Auxiliary Switch Block is a high-quality, front-mounted accessory designed to expand the auxiliary contacts of Siemens control devices. This essential component is engineered for seamless integration with SIRIUS 3RT2 Power Contactors and 3RH2 Contactor Relays, providing reliable signaling and interlocking functions in control circuits.

Featuring a robust configuration of 2 Normally Open (NO) and 2 Normally Closed (NC) contacts with dedicated screw terminals, it ensures secure and straightforward wiring in industrial control applications. The snap-on, front-mounting design allows for quick, tool-free installation and easy maintenance, making it a highly efficient solution for modern automation systems.

Function

The 3RH2916-1XA22-0MA0 auxiliary switch block is used to increase the number of available auxiliary contacts on a contactor or contactor relay. When the primary device (3RT2 or 3RH2) is energized, the mechanical action of the main poles simultaneously changes the state of the auxiliary contacts.

• The 2 NO contacts (53/54, 83/84) close.
• The 2 NC contacts (61/62, 71/72) open.

This simultaneous switching action is crucial for:

1. Status Signaling: Indicating the ON/OFF state of the contactor to a PLC or control system.
2. Interlocking: Creating safety circuits, ensuring one device cannot operate unless another has switched off.
3. Self-Holding Circuits: Implementing ‘latching’ logic in control circuits.

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