Siemens 3VU9131-3AA00 AUX Contact Block for 3VS/3VU

The Siemens 3VU9131-3AA00 AUX Contact Block for 3VS/3VU, also known as an auxiliary contact block or auxiliary contactor, is an electrical component used in conjunction with a contactor or relay. It provides additional electrical contacts that are mechanically linked to the main contacts of the contactor or relay. AUX contact blocks are commonly used to expand the functionality of contactors and relays by allowing for the monitoring, control, or signaling of the main circuit.

1. Additional Contacts: AUX contact blocks feature additional sets of contacts that are separate from the main contacts of the contactor or relay. These contacts are mechanically linked to the movement of the main contacts and provide additional electrical pathways for current flow.

2. Monitoring and Control: AUX contact blocks are often used for monitoring or control purposes. For example, they can be used to detect the status of the main contacts, such as whether they are open or closed. This information can be used for monitoring the operation of the contactor or relay or for providing feedback to other control devices in the system.

3. Signaling and Interlocking: AUX contact blocks can be used for signaling or interlocking purposes. They can be connected to indicator lights, alarms, or other signaling devices to provide visual or audible indication of the status of the main contacts. Interlocking configurations can be implemented to ensure that certain operations or sequences are performed in a specific order.

4. Normally Open (NO) and Normally Closed (NC) Contacts: AUX contact blocks can have normally open (NO) contacts, normally closed (NC) contacts, or both. The specific configuration depends on the application requirements. NO contacts are open in the resting position and close when the main contacts close, while NC contacts are closed in the resting position and open when the main contacts close.

5. Mounting and Compatibility: AUX contact blocks are designed to be easily mounted onto the contactor or relay. They typically have standardized mounting options that ensure compatibility with various contactor and relay models. This allows for easy integration into existing systems or the expansion of contactor and relay functionality.

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