ABB 1SDA066439R1 AUX-C 2Q+2SY+1S51 250Vac/dc XT2-XT4 W Withdrawable Auxiliary Contact

The ABB 1SDA066439R1 is the AUX-C 2Q+2SY+1S51 250Vac/dc XT2-XT4 W auxiliary contact, engineered for withdrawable mounting on ABB XT2 and XT4 series moulded case circuit breakers. Rated at 250V AC/DC, this auxiliary contact block provides combined signalling and trip indication outputs — making it an essential component for status monitoring and supervisory control in industrial switchgear panels. Compact at 110 mm × 60 mm and weighing just 232 g, it integrates cleanly into control panel assemblies.

Technical Specifications

Certifications & Standards

• RoHS: Compliant with EU Restriction of Hazardous Substances Directive
• REACH: Compliant with EU REACH regulation on chemical substances
• EU Directive 2011/65/EU & Amendment 2015/863: Compliant with European RoHS legislation and its updated amendment
• IEC 60947-2: Certified to the international standard for low-voltage circuit breakers and accessories
• UL 489: Listed to UL standard for molded-case circuit breakers and accessories
• CE: Marked for conformity with applicable EU directives
• WEEE: Compliant with EU Waste Electrical and Electronic Equipment Directive

Applications & Use Cases

The AUX-C 2Q+2SY+1S51 250Vac/dc XT2-XT4 W auxiliary contact is designed for use with ABB XT2 and XT4 moulded case circuit breakers in withdrawable configurations. Typical applications include:

• Circuit breaker status monitoring (open/closed indication) in MCC and switchgear panels
• Remote signalling to PLC and SCADA supervisory systems
• Trip/fault indication wiring for alarm annunciation panels
• Industrial automation and motor control centre (MCC) assemblies
• Control panel builds requiring IEC 60947-2 compliant accessories