ABB 1SDA051361R1 UVD T1..T6 - XT1..XT4 220..250Va.c./d.c. Undervoltage Release (Electronic Time Delay)

The ABB 1SDA051361R1 UVD T1..T6 - XT1..XT4 220..250Va.c./d.c. is an electronic time delay undervoltage release designed for use with ABB SACE Tmax T1 through T6 and XT1 through XT4 moulded case circuit breakers. Operating at a rated voltage of 220–250V AC/DC, this accessory monitors supply voltage and automatically trips the circuit breaker when voltage drops below the preset threshold, protecting motors, transformers, and sensitive equipment from damage caused by undervoltage conditions. Compact at 105 × 95 mm and weighing just 0.269 kg, it integrates directly into the breaker without additional panel space.

Technical Specifications

Certifications & Standards

• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Registration, Evaluation, Authorisation and Restriction of Chemicals — EU chemical safety compliance
• EU Directive 2011/65/EU & Amendment 2015/863 (July 22, 2019): Full compliance with the updated RoHS2 directive and its amendment restricting four additional phthalates
• IEC 60947-2: International standard for low-voltage switchgear and controlgear — circuit breakers
• UL 489: Underwriters Laboratories standard for molded-case circuit breakers, molded-case switches, and circuit-breaker enclosures
• WEEE: Waste Electrical and Electronic Equipment Directive — product registered for responsible end-of-life disposal

Applications & Use Cases

• Motor protection panels requiring automatic disconnection on undervoltage events
• Industrial automation control panels in manufacturing and process industries
• Power distribution boards where supply voltage integrity is critical
• Machine tool and conveyor systems demanding safe restart prevention after voltage loss
• Building services and infrastructure applications using Tmax T1–T6 or XT1–XT4 breakers