ABB 1SVR730850R0300 CM-ENS.31S 2C/O 0.1-1000kΩ 250V 4A (Fill)Level Monitoring Relay

The ABB CM-ENS.31S (SKU 1SVR730850R0300) is a liquid level monitoring relay designed for reliable fill-level detection in industrial automation and process control applications. Featuring two changeover (2C/O) output contacts, an adjustable sensitivity range of 0.1 to 1000 kΩ, and a rated voltage of 250 V at 4 A, the CM-ENS.31S delivers accurate, dependable level monitoring for conductive liquids across a wide range of installations.

Technical Specifications

Certifications & Standards

• CE: Conforms to European Union safety, health, and environmental protection requirements
• UKCA: UK Conformity Assessed marking for Great Britain market compliance
• cULus: Listed by Underwriters Laboratories for both US and Canadian markets
• UL 508: Standard for industrial control equipment
• CAN/CSA C22.2 No.14: Canadian standard for industrial control equipment
• CSA: Canadian Standards Association certification
• CCC: China Compulsory Certification for the Chinese market
• IEC/EN 60255-27: Mechanical requirements for measuring relays and protection equipment
• IEC/EN 61000-6-2: Electromagnetic compatibility — immunity for industrial environments
• IEC/EN 61000-6-3: Electromagnetic compatibility — emission standard for residential/industrial environments
• IEC/EN 63000: Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances
• IEC 60715: Dimensions of low-voltage switchgear and controlgear — DIN rail mounting
• EN 60255 / EN 61000-6: Measuring relays and protection equipment; EMC standards family
• REACH: Compliant with EU regulation on registration, evaluation, authorisation and restriction of chemicals
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU

Applications & Use Cases

• Liquid level detection in tanks, reservoirs, and sumps for conductive media
• Pump protection — automatic start/stop based on fill level thresholds
• Overflow and dry-run prevention in water treatment and HVAC systems
• Process automation in food & beverage, chemical, and pharmaceutical plants
• Building management systems requiring reliable level monitoring with relay outputs