SR489-P5-HI-A20-E是由GE Multilin为489系列制造的发电机管理继电器。该继电器具有 5 A 相 CT 辅助。HI 控制功率为 90-300 VDC 和 70265 VAC（48-62 Hz）。该继电器上的模拟输出为 4 至 20 mA。此继电器具有基本显示。当继电器通电时，继电器触点接触不安全。如果低电压可访问应用需要输出继电器触点，则客户有责任确保适当的绝缘水平。保险丝电流额定值为 2.5 A。保险丝类型为5x20mm HRC SLO-BLO Littelfuse，保险丝型号为215-02.5。 489表示此部件来自的系列。接下来的两位数字是相电流输入，它们是P1（1 A相位CT辅助）或P5（5 A相位CT辅助）。接下来的两位数字是控制电源，它们是LO（20-60 VDC和20-48 VAC，48-62 Hz）或HI（90-300 VDC和70-265 VAC，48-62 Hz）。接下来的两位或三位数字是模拟输出，它们是A1（0至1 mA模拟输出）或A20（4至20 mA模拟输出）。下一个数字是显示器，它要么是空白（基本显示），要么是 E（使用较大 LCD 的增强显示），要么是 T（使用以太网 10Base-T 的增强显示）。下一位数字是恶劣环境保护，其中H是化学环境保型涂层。

SR489-P5-HI-A20 is a generator management relay manufactured by GE Multilin for 489 series. The relay has 5 A phase CT assistance. HI control power is 90-300 VDC and 70265 VAC(48-62 Hz). The analog output on this relay is 4 to 20 mA. This relay has a basic display. When the relay is energized, the contact of the relay is unsafe. If low-voltage accessible applications require output relay contacts, it is the customer's responsibility to ensure an appropriate insulation level. The current rating of the fuse is 2.5 A.. The fuse type is 5x20mm HRC SLO-BLO Littelfuse, and the fuse model is 215-02.5. The order number of this series tells users some detailed information about the parts. 49 indicates the series from which this part comes. The next two digits are the phase current inputs, which are P1(1 A phase CT assistance) or P5(5 A phase CT assistance). The next two digits are the control power supply. They are LO(20-60 VDC and 20-48 VAC, 48-62 Hz) or HI(90-300 VDC and 70-265 VAC, 48-62 Hz). The next two or three digits are analog outputs, which are A1(0 to 1 mA analog output) or A20(4 to 20 mA analog output). The next number is the display, which is either blank (basic display), E (enhanced display using larger LCD) or T (enhanced display using Ethernet 10Base-T). The next digit is severe environmental protection, where H is the chemical environment-friendly coating.