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
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.