The Square D 8430‑V4460 Load Detector is a 460 VAC relay‑type current sensor used to monitor motor loads and trigger alarms or control actions when setpoints are exceeded. Common failure modes in this class of devices include coil burnout, contact wear or pitting, insulation breakdown between the primary winding and case, and drift of the internal calibration causing false trips. Typical symptoms are intermittent operation, no indication on the indicator lamp, or incorrect load readings displayed on a connected PLC. First‑check diagnostics: verify 460 VAC supply voltage to the unit, inspect the coil for visible damage or burn marks, and test the relay contacts with a multimeter for continuity; also review any error codes from the host controller that reference the detector.[oss-gpt-20b]