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PR122/P-LSIG

The ABB PR122/P-LSIG is a digital electronic trip unit housed within ABB's Isomax S series molded case circuit breakers. It is designed for advanced protection and selectivity in low-voltage electrical systems.

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Specifications Protection Functions L – Long-time protection Adjustable pickup (typically 0.4–1 × In) and time delay for overload protection. S – Short-time protection Adjustable pickup and time delay with I²t or fixed delay selection. I – Instantaneous protection Adjustable magnetic trip for short-circuit fault clearing. G – Ground-fault protection Adjustable pickup and delay to protect against ground-fault currents. Measurement & Monitoring Measures: Phase currents Neutral current (with module) Ground-fault current Thermal capacity Trip history & alarms Digital LCD display for settings and real-time data. Adjustable Settings L (Long-time): Pickup & delay adjustable S (Short-time): Pickup & delay adjustable; I²t ON/OFF I (Instantaneous): Adjustable trip threshold G (Ground-fault): Pickup & delay adjustable Supported Rated Currents Works with Emax/Emax2 breakers from In 160A – 6300A (depends on breaker frame) Accuracy Current measurement accuracy: typically ±1% Protection tripping accuracy per IEC standards Display & Interface Multifunction LCD display LED status indicators Front pushbuttons for settings navigation Communication (optional) Compatible with ABB communication modules (Modbus, Profibus, DeviceNet, etc.) Event logging and remote supervision when communication enabled Power Supply Self-powered from current sensors (CT-fed), auxiliary power optional depending on configuration. Standards Compliance IEC 60947-1 IEC 60947-2 CE and international certifications (breaker dependent) Installation Plug-in module for ABB Emax/Emax2 air circuit breakers Field-replaceable trip unit