AUX-C 2Q+2SY+1S51 Auxiliary Contact Block for XT2-XT4 | ABB

The Original New ABB 1SDA066438R1 AUX-C 2Q+2SY+1S51 Auxiliary Contact Block is a multi‑function signalling and auxiliary contact accessory designed for ABB XT2 and XT4 series moulded case circuit breakers (MCCBs) in fixed or plug‑in mounting configurations. This comprehensive contact block combines 2 changeover contacts (2Q) for open/closed status indication, 2 signalling contacts (2SY) for tripped indication, and 1 additional open contact (1S51) for fault signalling — all in a single compact unit. Rated at 250V AC/DC with a 4A operational current, it enables comprehensive status monitoring and control panel integration for industrial automation, motor control centres, and power distribution applications.

Core Engineering Highlights:
Contact configuration: 2Q + 2SY + 1S51 (5 total contacts)| Rated voltage: 250V AC/DC| Rated operational current (Ie): 4A at AC-15, 230V| Compatible with ABB XT2 and XT4 MCCBs (fixed/plug-in)| Spring clamp connection| Integrated mounting| Net weight: 0.177 kg| Made in: Germany| Conforms to IEC 60947-2, UL 489, CE, RoHS, REACH

Key Features:

• Original New ABB 1SDA066438R1 auxiliary contact block

• Contact configuration: 2 changeover contacts (open‑closed status) + 2 changeover contacts for tripped indication + 1 open contact for fault signalling

• Rated voltage: 250V AC/DC

• Rated operational current: 4A at AC-15, 230V

• Suitable for fixed and plug‑in mounting configurations

• Spring clamp connection for secure, tool‑free wiring

• Comprehensive status monitoring: open/closed, tripped, and fault signalling

• Compact design: 5 contacts in a single unit reduces panel space and wiring complexity

• For use with ABB SACE Tmax XT2 and XT4 MCCBs

• Conforms to IEC 60947-2, UL 489, CE, RoHS, REACH

• Wired version with pre‑assembled cables for simplified installation

Applications:

• Status monitoring and remote signalling in industrial control panels with 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

Technical Specifications:

System Compatibility:

• Compatible with ABB SACE Tmax XT2 and XT4 moulded case circuit breakers in fixed or plug‑in mounting configurations

• Suitable for use with XT1, XT2, XT3, XT4 series (contact configuration compatibility varies)

• Wired version with pre‑assembled cables

• Spring clamp connection enables rapid field wiring

Wiring & Contact Configuration:

• Q (Changeover contact): Open/closed status indication (2 contacts)

• SY (Signalling contact): Tripped indication contact (2 contacts)

• S51 (Contact open): Fault/early signalling contact (1 contact)

Related Products:

• 1SDA066431R1 – AUX-C 1Q+1SY 250V AC/DC XT1-XT4 F/P

• 1SDA066433R1 – AUX-C 2Q+1SY 250VAC/DC XT1-XT4 F/P

• 1SDA066434R1 – AUX-C 3Q+1SY 250VAC/DC XT2-XT4 F/P

• 1SDA066436R1 – AUX-C 3Q+2SY 250VAC/DC XT2-XT4 F/P

• 1SDA066440R1 – AUX-C 2Q 400V AC XT2-XT4 F/P

• 1SDA066444R1 – AUX-C 1Q+1SY 400Vac XT2-XT4 F/P

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. ABB and SACE are trademarks of ABB Group.