ABB 1SNA645071R0000 RB121-24VDC R600 1C/O 24VDC Coil 6A 250VAC DIN Rail Switching Relay

The ABB RB121-24VDC (SKU: 1SNA645071R0000) is a compact R600 series interface switching relay featuring a 1C/O (SPDT) contact configuration, a 24VDC coil, and a rated switching capacity of 6A at up to 250VAC. Designed for DIN rail installation in control panels and automation systems, this relay bridges low-level control signals to higher-power loads with a slim 6mm profile, making it ideal for high-density panel layouts.

Technical Specifications

Certifications & Standards

• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• UKCA: UK Conformity Assessed — meets Great Britain market requirements post-Brexit
• UL 508: Industrial Control Equipment — certified for use in North American industrial control panels
• CAN/CSA C22.2 No.14: Industrial Control Equipment — Canadian Standards Association certification
• CSA: Canadian Standards Association general certification
• CCC: China Compulsory Certification — mandatory for products sold in China
• CQC: China Quality Certification — voluntary quality mark for the Chinese market
• UL 94-V0: Flammability rating — housing material meets the highest UL flammability class
• IEC/EN 60947-5-1: Low-voltage switchgear and controlgear — control circuit devices and switching elements
• IEC/EN 63000: Technical documentation for assessment of electrical and electronic products with respect to restriction of hazardous substances
• EN 60947-5: Low-voltage switchgear — control circuit devices standard
• REACH: EU regulation on chemicals — compliant with Registration, Evaluation, Authorisation and Restriction of Chemicals
• RoHS: Restriction of Hazardous Substances — free from restricted hazardous materials per EU Directive 2011/65/EU

Applications & Use Cases

• Signal isolation and level shifting between PLCs and field devices
• Interface between low-power control circuits and higher-load switching circuits
• High-density DIN rail control panel assemblies where slim form factor is critical
• Industrial automation and process control systems
• Machine control and building automation applications
• OEM equipment requiring compact, globally certified relay modules

Frequently Asked Questions

What is the coil voltage of the RB121-24VDC?
The coil operates on 24VDC, making it directly compatible with standard PLC output cards and 24V control voltage systems.

What contact configuration does the ABB RB121-24VDC provide?
It provides a 1C/O (single-pole double-throw / SPDT) contact, offering both normally open (NO) and normally closed (NC) switching paths.

What is the width of this relay on a DIN rail?
The RB121-24VDC has a 6mm width, enabling very high packing density in control panel layouts.

Is the ABB RB121-24VDC RoHS and REACH compliant?
Yes, the relay is certified compliant with both RoHS and REACH regulations, as well as CE and UKCA marking, making it suitable for sale across the EU and UK markets.