Key Technical Parameters General & Compatibility Product / Model: ABB Auxiliary Contact Block Part Number: 1SDA054911R1 Designed For: Use with ABB Tmax T series MCCBs (T4, T5, T6 frames) Accessory Type: Auxiliary contact block (contact extension / signaling) Voltage Rating: Up to 250 V AC/DC Contact Configuration Total Contacts: 4 changeover contacts 3 changeover contacts for main auxiliary switching 1 changeover contact dedicated for “tripped” indication Contact Type: Changeover (SPDT) style — providing both NO and NC behavior as needed for control logic Usage & Function Status Signaling: Provides remote indication of MCCB position (ON/TRIPPED/OFF) via auxiliary contacts Control Logic: Suitable for use in interlocks, alarms, and safety control circuits Installation: Mounted directly on compatible circuit breaker frames (T4, T5, T6), expanding their auxiliary interface Mechanical & Environmental Mounting Style: Breaker accessory block — attaches to the side of a compatible MCCB Compact Size: Designed not to significantly increase MCCB footprint Indicator Outputs: Multiple changeover outputs allow integration with PLCs, meter trip logic, and alarm systems Typical Applications Remote breaker status monitoring Integration into control panels and switchgear Safety or automation systems requiring breaker feedback Interlocking and alarm circuits driven by breaker state