1.3.2 ELECTRONIC RELEASES These releases are connected with current transformers (three or four according to the number of conductors to be protected), which are positioned inside the circuit-breaker and have the double functions of supplying the power necessary to the proper functioning of the release (self-supply) and of detecting the value of the current flowing inside the live conductors; therefore they are compatible with alternating current networks only. The signal coming from the transformers and from the Rogowsky coils is processed by the electronic component (microprocessor) which compares it with the set thresholds. When the signal exceeds the thresholds, the trip of the circuit-breaker is operated through an opening solenoid which directly acts on the circuit-breaker operating mechanism. In case of auxiliary power supply in addition to self-supply from the current transformers, the voltage shall be 24 Vdc ± 20%. Besides the standard protection functions, releases provide: - measuraments of currents (Ekip LSI/LSIG + Ekip COM, Ekip M LRIU + Ekip COM, PR222, PR232, PR331, PR121); - measurament of currents,voltage,frequency,power,energy,power factor (PR223,PR332,PR122) and moreover for PR333 and PR123, the measurement of harmonic distortions is available; - serial comunication with remote control for a complete management of the plant (Ekip LSI/LSIG + Ekip COM, Ekip M LRIU + Ekip COM, PR222, PR223, PR232, PR331, PR332, PR333, PR121, PR122, PR123). The following table shows the types of electronic trip units available for SACE Tmax XT, Tmax T and Emax circuit-breakers.

1.3.2电子版本
这些脱扣器与电流互感器（三个或四个）相连
要保护的导线数量），这些导线位于
断路器和断路器具有提供所需电源的双重功能
确保释放（自供）和检测值的正常运行
带电导体内部流动的电流；因此它们是相容的
仅适用于交流电网。
来自变压器和罗氏线圈的信号是
由比较它的电子元件（微处理器）处理
设定阈值。当信号超过阈值时，控制器跳闸
断路器通过直接作用于断路器的分闸电磁阀进行操作
断路器操作机构。
如果是辅助电源，除了来自电流的自供电
变压器，电压应为24 Vdc±20%。
除了标准保护功能外，释放还提供：
-电流测量（Ekip LSI/LSIG+Ekip COM、Ekip M LRIU+Ekip COM、，
PR222、PR232、PR331、PR121）；
-电流、电压、频率、功率、能量、功率因数的测量
（PR223、PR332、PR122）此外，对于PR333和PR123，可以测量谐波失真；
-通过远程控制进行串行通信，实现对
工厂（Ekip LSI/LSIG+Ekip COM、Ekip M LRIU+Ekip COM、PR222、，
PR223、PR232、PR331、PR332、PR333、PR121、PR122、PR123）。
下表显示了可供选择的电子脱扣器类型
SACE Tmax XT、Tmax T和Emax断路器。