ABB SACE PR122/P LSIG

Overview

ABB SACE PR122/P LSIG is a programmable electronic trip unit for the classic ABB SACE Emax E1/E2/E3/E4 series air circuit breakers. ABB SACE PR122/P LSIG supports LSIG full protection function set, equipped with LCD display, local keypad and optional communication module for power metering, fault recording and SCADA integration. ABB SACE PR122/P LSIG is widely supplied as exchange spare for low voltage main switchboard, bus tie and large feeder breaker overhaul.

Features

ABB SACE PR122/P LSIG provides L long-time overload, S short-time delay short-circuit, I instantaneous short-circuit and G earth fault protection. All protection curves, current thresholds and time delays can be adjusted locally via the front panel or configuration software. It supports real-time electrical parameter measurement including three-phase current, voltage, active power, reactive power, energy and power factor. ABB SACE PR122/P LSIG records trip logs, fault current values and can capture fault waveforms for post-fault analysis. It can be fitted with PR120/D communication module to support Modbus RS485 for remote data reading, setting upload/download and SOE alarm transmission. ABB SACE PR122/P LSIG adopts self-powered design from breaker CTs, and can be equipped with external auxiliary power supply for pre-fault display and communication when load current is low. It has built-in self-diagnosis for CT failure, internal hardware anomaly and supply fault, and conforms to IEC 60947-2 standard. Compared with basic PR121/P, it adds metering, fault recording and communication expandability; PR123/P is the higher-grade version with more advanced functions.

Specs

ABB SACE PR122/P LSIG is matched to Emax E1 ~ E4 frame ACB, the rated In is determined by the current sensor assembly paired with the trip unit. Protection: LSIG. Human interface: LCD + keypad. Communication: expandable PR120/D Modbus RS485. Power supply: CT self-power, optional external 24VDC auxiliary supply. Earth fault protection can be selected as residual type. ABB SACE PR122/P LSIG is widely supplied as spare for breaker retrofitting and trip unit replacement.

Principle

ABB SACE PR122/P LSIG continuously samples phase current and residual earth fault current from the breaker integrated CTs. The internal microprocessor calculates thermal accumulation and fault magnitude according to real-time current, and compares against user-configured protection settings. When the threshold is exceeded, the trip unit triggers the breaker mechanical release mechanism to open the main contacts and isolate the fault. The measured values, alarm status and fault records of ABB SACE PR122/P LSIG can be uploaded to DCS or SCADA system through communication module. The earth fault function detects residual current caused by insulation failure to prevent equipment damage and electric shock risk.

Applications

ABB SACE PR122/P LSIG is deployed on main incoming, bus tie and large feeder ACB in industrial plants, water treatment, power stations, marine main switchboards and data center low voltage distribution systems. It is selected for spare inventory and switchgear renovation projects requiring complete LSIG protection, power metering and remote communication capability. It is the mainstream mid-range electronic release for ABB SACE Emax series air circuit breakers.