SCHMERSAL SRB301ST-24V Used Working Safety Relay

Product Overview

The Schmersal SRB301ST-24V is a high-reliability Safety Relay Module designed for the professional monitoring of emergency stop buttons, safety switches, and interlocking devices. Part of the Protect SRB series, this dual-channel safety controller is engineered to meet the highest safety standards, including PLe (ISO 13849-1) and SIL 3 (IEC 61508). As a Used Working unit, this relay provides a critical fail-safe interface for industrial machinery, ensuring that hazardous movements are stopped instantly upon a safety breach while preventing an unintended restart.

Key Features

• Multi-Functional Safety Monitoring: Capable of evaluating signals from 1 or 2-channel emergency stop circuits, safety doors, or light curtains.
• Triple Safety Outputs: Features 3 normally open (NO) safety contacts for direct integration into the machine's power-cut circuit.
• Auxiliary Monitoring: Includes 1 normally closed (NC) auxiliary contact for signaling the safety status to a PLC or external alarm system.
• Automatic or Manual Reset: Offers selectable start functions, allowing for automatic reset or a supervised manual start button configuration.
• Hybrid Internal Logic: Utilizes a combination of relay technology and solid-state diagnostics for long-term switching reliability.
• Compact 22.5mm Housing: The slim "Tower" design allows for high-density installation on a standard DIN rail, saving valuable control cabinet space.
• Diagnostic LEDs: Equipped with front-panel LED indicators for Power, Channel 1, and Channel 2, enabling rapid visual fault detection.

Item Condition (Used Working)

• Functional Status: Used Working. This safety relay has been professionally bench-tested. Both input channels and all three safety output contacts have been verified for correct switching and timing.
• Physical State: Clean industrial condition. The transparent front cover is intact, and the terminal screws are in excellent condition. The housing shows no signs of heat stress or cracking.
• Technical Integrity: The internal safety relays are free of contact welding. The unit has been cleared of any industrial dust and handled in an ESD-safe environment.
• Note: Professional installation by a qualified safety engineer is mandatory. Ensure that the external wiring complies with the required Category/SIL level for your specific machine application.

Package Includes

1. 1 x Schmersal SRB301ST-24V Safety Relay Module