The Schmersal SRB-NA-R-C.21-24V is a safety relay module designed for monitoring emergency stop devices and safety interlock switches. It features five enabling outputs and one monitoring output, providing reliable safety control in industrial applications. The module operates on a 24 V AC/DC power supply and is suitable for use in safety circuits up to Category 4 according to EN 954-1.

Key Features:

• Enabling Outputs: Equipped with five enabling outputs (3 NO, 2 NO time-delayed) and one monitoring output (1 NC) for versatile safety applications.

• Adjustable Time Delay: Offers an adjustable drop-out delay ranging from 0 to 30 seconds, allowing for customizable response times.

• Selectable Functions: Includes options for trailing edge function, auto reset, and cross-short recognition to enhance safety monitoring.

• Compact Design: Housed in a 45 mm-wide thermoplastic enclosure suitable for DIN rail mounting, facilitating easy integration into control panels.

Technical Specifications:

• Model Number: SRB-NA-R-C.21-24V

• Operating Voltage: 24 V AC/DC (–15%/+20%)

• Power Consumption: Maximum 4.0 VA, plus monitoring output L62

• Enabling Contacts Rating: 230 V AC, 4 A ohmic load; for NO 43/44 and 53/54: 24 V DC/2 A (DC 13), 230 V AC/3 A (AC 15)

• Fuse Protection: 4 A slow-blow fuse for enabling contacts; internal 1.25 A fuse for power supply

• Dimensions (H x W x D): 83 mm x 45 mm x 140 mm

• Weight: Approximately 480 g

Applications:

• Emergency Stop Monitoring: Ensures immediate shutdown of machinery during emergency situations.

• Safety Gate Monitoring: Monitors the status of safety gates and interlock switches to prevent unauthorized access to hazardous areas.

• Industrial Safety Systems: Integrates into various safety circuits to enhance overall machine safety in compliance with international standards.

Schmersal - SRB-NA-R-C.21-24V - Safety Relay Module