ABB 1SDA054891R1 UVR-C T4-T5-T6 220...250 Vac/dc Undervoltage Release Accessory for Moulded Case Circuit Breaker

The ABB 1SDA054891R1 UVR-C T4-T5-T6 220...250 Vac/dc is a factory-fit undervoltage release accessory designed for ABB Tmax T4, T5, and T6 moulded case circuit breakers. This release trips the circuit breaker automatically when the supply voltage falls below a safe threshold, protecting motors, control systems, and sensitive industrial loads from damage caused by voltage drops or supply loss. Rated for 220 to 250 V AC/DC, it integrates directly into the MCCB and is a critical component in protection schemes for industrial control panels and power distribution systems.

Technical Specifications

Certifications & Standards

• CE: Conforms to European Union safety, health, and environmental protection requirements
• RoHS: Compliant with EU Directive 2011/65/EU — restriction of hazardous substances in electrical and electronic equipment
• REACH: Compliant with EU Regulation EC No 1907/2006 — registration, evaluation, authorisation and restriction of chemicals
• WEEE: Compliant with EU Directive 2012/19/EU — waste electrical and electronic equipment recycling obligations

Applications & Use Cases

• Undervoltage and no-voltage protection in industrial power distribution panels
• Motor circuit protection against voltage sags and supply interruptions
• Control panel interlocking to prevent automatic restart after power loss
• Building automation and infrastructure systems requiring automatic disconnection on low voltage
• Process control systems where voltage loss can cause unsafe equipment states