Siemens 3RA2815-2AW10 Solid-State Off-Delay Auxiliary Switch Original Brand New

Overview

The Siemens 3RA2815-2AW10 is a high-performance, solid-state time-delayed auxiliary switch designed for use with SIRIUS 3RT20 power contactors and 3RH2 contactor relays. This essential component offers an OFF-delay function (delay on de-energization) without the need for an external control signal, simplifying complex control logic and reducing wiring effort. Its plug-and-play front mounting and wide-range control voltage make it a versatile and reliable choice for industrial automation and motor control applications.

Benefits & Features

1. High Accuracy and Reliability (Solid-State): Utilizing solid-state technology, the 3RA2815-2AW10 ensures high repeat accuracy ($\pm 1\%$) and a long mechanical service life, essential for precise timing in critical industrial processes.
2. Space and Cost Savings: The unique front-mounting, clip-on design allows for tool-free installation directly onto the contactor, eliminating the need for a separate DIN-rail-mounted timing relay and saving valuable cabinet space.
3. Wide-Range Flexibility: The universal control voltage of 24-240 V AC/DC simplifies inventory management and enables application across diverse international electrical systems.
4. Integrated Coil Protection: A factory-fitted varistor is integrated for suppression of switching surges in the contactor coil, protecting sensitive electronics and extending the lifespan of the equipment.
5. Easy and Secure Wiring: The modern spring-loaded terminal (push-in connection) offers fast, vibration-proof, and maintenance-free wiring compared to traditional screw terminals.

Function & Application

The OFF-delay function ensures that the auxiliary contact’s state change only occurs after the adjustable time (0.05-100 s) has elapsed following the de-energization of the main contactor coil. This is crucial for:

• Sequential Shut-down: Ensuring one component (e.g., a motor) runs for a set time after the primary control signal is removed, such as a cooling fan continuing to operate to dissipate residual heat.
• Delayed Signaling: Providing a delayed signal to a PLC or control circuit after a motor has been commanded to stop.
• Safety Interlocks: Implementing timing-dependent safety procedures in machinery.

By snapping the 3RA2815-2AW10 onto the front of your Siemens 3RT20 or 3RH2 device, you integrate a reliable, fully self-contained timing function directly into your motor control center.

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