ABB 1SVR730100R0300 CT-ERS.21S ON-Delay Timer Relay 2C/O 24-240VAC/DC CT-S Series

The ABB CT-ERS.21S (SKU: 1SVR730100R0300) is an ON-delay timer relay from the CT-S series, featuring a 2-changeover output contact and a wide supply voltage range of 24–240V AC/DC. Designed for industrial automation and control panel applications, the CT-ERS.21S provides reliable, precise time-delayed switching for machinery sequencing, HVAC control, and process automation. Its compact 22.5 mm DIN rail form factor simplifies panel integration.

Technical Specifications

Certifications & Standards

• CE: Conformité Européenne — meets EU safety, health, and environmental protection requirements
• UKCA: UK Conformity Assessed — meets UK market regulatory requirements post-Brexit
• cULus: Listed to both UL (US) and CSA (Canadian) safety standards for industrial control equipment
• UL 508: UL standard for industrial control equipment
• CSA C22.2 No.14: Canadian Standards Association standard for industrial control equipment
• CCC: China Compulsory Certification for the Chinese market
• IEC/EN 61812-1: International/European standard for time relays for industrial and residential use
• IEC/EN 63000: Technical documentation for assessment of electrical and electronic products with respect to the restriction of hazardous substances
• REACH: Compliant with EU REACH regulation (Registration, Evaluation, Authorisation and Restriction of Chemicals)
• RoHS: Restriction of Hazardous Substances — compliant with EU RoHS Directive, restricting use of hazardous materials in electrical equipment

Applications & Use Cases

• Machine sequencing and start-up delay control in industrial automation
• HVAC system fan and compressor delay-on start
• Conveyor belt and motor start-delay protection
• Process control panels requiring precise ON-delay timing
• Building automation and lighting control systems