ABB 1SDA066438R1 AUX-C 2Q+2SY+1S51 250Vac/dc XT2-XT4 F/P Auxiliary Contact

The ABB 1SDA066438R1 auxiliary contact, catalog number AUX-C 2Q+2SY+1S51 250Vac/dc XT2-XT4 F/P, is a multi-function signalling and auxiliary contact accessory designed for use with ABB XT2 and XT4 series moulded case circuit breakers in fixed or plug-in mounting configurations. Rated at 250V AC/DC, this contact block combines 2Q (alarm contacts), 2SY (early make/break signalling contacts), and 1S51 contacts in a single compact unit, enabling comprehensive status monitoring and control panel integration for industrial automation applications.

Technical Specifications

Certifications & Standards

• RoHS: Compliant with EU Restriction of Hazardous Substances Directive
• REACH: Compliant with EU REACH regulation for chemical safety
• EU Directive 2011/65/EU: Compliant including Amendment 2015/863, effective July 22, 2019
• IEC 60947-2: Meets international standard for low-voltage switchgear and circuit breakers
• UL 489: Listed to UL standard for molded-case circuit breakers and circuit breaker enclosures
• CE: Carries CE marking confirming conformity with applicable EU directives
• WEEE: Registered under the Waste Electrical and Electronic Equipment Directive for responsible end-of-life disposal

Applications & Use Cases

• Status monitoring and remote signalling in industrial control panels incorporating ABB XT2 or XT4 MCCBs
• Early make/break signalling for protection relay coordination and interlocking schemes
• Alarm output wiring for SCADA, PLC, and building management systems
• Fixed and plug-in switchboard configurations in commercial and industrial power distribution
• Motor control centres and industrial automation assemblies requiring multi-function auxiliary contacts