Siemens 6ES7505-0RB00-0AB0 System Power Supply With Buffer Function

Siemens 6ES7505-0RB00-0AB0 is a SIMATIC S7-1500 system power supply with buffer functionality (PS 60 W, 24/48/60 V DC HF) that powers the backplane bus of the S7-1500 rack and enables RAM retention in the CPU during short power interruptions. The module provides a nominal 24/48/60 V DC to the backplane with rated input currents of 3 A at 24 V and 1.5 A at 48 V, and features mains buffering of about 20 ms to bridge brief outages. It includes reverse polarity protection and short-circuit protection, has an IP20 housing, and fits as a compact 105 mm wide by 147 mm high by 129 mm deep unit weighing approximately 865 g. Electrical tolerances specify a nominal input of 24/48/60 V DC with static lower limits around 19.2 V (dynamic 18.5 V) and static upper limits around 72 V (dynamic 75.5 V). Designed specifically for SIMATIC S7-1500 systems, 6ES7505-0RB00-0AB0 ensures a stable supply to the backplane while preserving RAM data during transient events, making it a reliable choice for applications demanding continuity of CPU memory during power disturbances.