ABB 1SVR730850R0200 CM-ENS.21S 1C/O 0.1-1000kΩ 4A 250V (Fill)Level Monitoring Relay

The ABB CM-ENS.21S (SKU: 1SVR730850R0200) is a liquid (fill)level monitoring relay featuring a single changeover output contact and an adjustable sensitivity range of 0.1 to 1000 kΩ, making it suitable for detecting the presence or absence of conductive liquids across a wide range of industrial applications. Rated at 4 A and 250 V, the CM-ENS.21S mounts on standard DIN rail and integrates seamlessly into control panel assemblies requiring reliable level detection and process protection.

Technical Specifications

Certifications & Standards

• IEC/EN 63000: Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances
• IEC/EN 60255-27: Measuring relays and protection equipment — product safety requirements
• IEC/EN 61000-6: Electromagnetic compatibility (EMC) — generic standards for emission and immunity
• IEC 60715: Dimensions of low-voltage switchgear and controlgear — standardised mounting on rails
• EN 63000: European harmonised standard for RoHS technical documentation
• EN 60255-27: European standard for measuring relays and protection equipment safety
• EN 61000-6: European EMC generic standard
• UL 508: Standard for industrial control equipment (North America)
• CSA C22.2 No. 14: Canadian standard for industrial control equipment
• CSA: Canadian Standards Association certification
• REACH: Compliance with EU Regulation (EC) No 1907/2006 on chemicals
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU

Applications & Use Cases

• Liquid level detection in tanks, reservoirs, and process vessels
• Pump protection against dry-run or overflow conditions
• Water and wastewater treatment plant automation
• Food and beverage processing level control
• HVAC and building services water management
• Machine tool coolant level monitoring