DSP series devices are 8A power relays that are nearly as small as signal relays. The broad line-up consists of 54 types, including single side stable, 1 coil latching and 2 coil latching operating functions for all contact arrangements (1NO, 1NO 1NC, 2NO). Direct driving by transistors and chips. This handbook covers the code of practice in protection circuitry including standard lead and device numbers, mode of connections at terminal strips, colour codes in multicore cables, dos and donts in execution. Advancements in digital technology have allowed relay manufacturers to include more and more relay functions within a single hardware platform. However, since the performance of the relay protection tester itself directly affects the evaluation of the relay protection device, the working performance and stability. Experience the benchmark in grid protection, automation, and monitoring! SIPROTEC 5, built on extensive field experience, offers comprehensive functionalities and device types for modern electrical energy systems. Its modular design and powerful DIGSI 5 engineering tool provide tailored solutions. These relays are capable of performing complex processing faster and with higher accuracy as.