The secondary wiring terminals of air circuit breakers (ACBs) rated 800A-6300A are designed for control, monitoring, and protection functions. These terminals typically include:

Auxiliary Contacts – Provide breaker status signals (open/closed/tripped) for remote indication and interlocking.

Shunt Trip/Close Coils – Enable remote tripping/closing via external control signals (typically 24V DC to 240V AC/DC).

Undervoltage Release (UVR) – Automatically trips the breaker when voltage drops below a set threshold.

Alarm Contacts – Signal faults (e.g., trip due to overload or short circuit).

Current Transformer (CT) Connections – Interface with protection relays for current monitoring.

Wiring must comply with manufacturer specifications, using proper wire gauges and insulation. Terminals are often screw-type or plug-in for secure connections. Ensure correct polarity for DC coils and verify voltage ratings. Secondary circuits should be isolated from high-voltage parts to prevent interference.

These terminals enhance system automation and safety, enabling integration with SCADA, PLCs, or protection relays. Always follow local standards (e.g., IEC 60947) during installation.