ABB 1SDA054892R1 UVR-C T4-T5-T6 380...440 Vac Undervoltage Release Accessory for Molded Case Circuit Breaker

The ABB 1SDA054892R1 UVR-C T4-T5-T6 380...440 Vac is a factory-designed undervoltage release accessory for ABB SACE Tmax T4, T5, and T6 molded case circuit breakers (MCCBs). The UVR-C T4-T5-T6 380...440 Vac monitors supply voltage continuously and automatically trips the circuit breaker when voltage drops below the threshold, protecting motors, drives, and sensitive industrial loads from damage caused by undervoltage conditions. Rated for 380 to 440 V AC systems, this compact accessory integrates directly into the breaker without external wiring complexity.

Technical Specifications

Certifications & Standards

• CE: Compliant with applicable European Union directives for electrical equipment
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU and Amendment 2015/863
• REACH: Compliant with EU REACH regulation on chemical substances
• WEEE: Compliant with EU Waste Electrical and Electronic Equipment Directive for responsible end-of-life disposal

Applications & Use Cases

• Motor protection in industrial automation and control panels where undervoltage events can cause motor stall or damage
• Protection of variable speed drives and sensitive loads on 380–440 V AC distribution networks
• Safety interlocking in machine control circuits requiring automatic disconnection on supply failure
• Integration into MCC (Motor Control Centre) assemblies using ABB Tmax T4, T5, or T6 breakers
• Building services and infrastructure panels requiring voltage-loss trip functionality