Siemens 3UG4513-1BR20 Phase Monitoring Relay Module

Siemens 3UG4513-1BR20 Phase Monitoring Relay Module is a SIRIUS DPDT monitoring relay that protects motors and control circuits by watching phase sequence, detecting phase loss on any of the three phases, and monitoring undervoltage conditions. It operates from a three-phase supply of 160 to 690 V AC at 50–60 Hz, features a fixed 5% hysteresis, and provides an adjustable reaction delay of 0–20 seconds to prevent nuisance tripping; it also includes two changeover contacts for signaling and interlocking in your control logic. The module is designed for DIN rail mounting with screw-terminal connections and carries an IP20 protection rating in typical installations, making it suitable for standard electrical enclosures and panel builders. This model is documented by Siemens as the current 3UG45 family device, with a recommended successor to 3UG5514-1BR20, indicating ongoing product evolution while preserving the core functions of phase failure, phase sequence, and undervoltage/asymmetry monitoring in a compact DIN rail package.