Parameter Category Specification Product Family / Type Numerical Motor Protection Relay Standard Compliance IEC 60255, IEC 60947-1, -4, -5 Rated Auxiliary Supply Voltage (Us) 24 - 48 V DC Motor Current Input (CT Secondary) 1 A or 5 A (Hardware selectable via DIP switch) Protection Functions • Thermal Overload (49) Based on motor FLC setting. Tripping characteristic matches motor thermal capacity. Separate alarm and trip settings. Cool/Start inhibit. • Short Circuit / Instant OC (50) High-set instantaneous overcurrent for short-circuit protection. • Start-up Supervision / Stall (48/14) Separate thermal model for start-up. Protects against locked rotor and prolonged starts. • Phase Unbalance / Loss (46) Protects against negative sequence currents due to phase unbalance or loss. • Earth-Fault (50N/51N) Residual current measurement (via core balance CT or derived). Instantaneous or time-delayed. • Undercurrent (37) Optional protection against pump run-dry or loss of load. • Number of Starts Programmable restriction on successive starts to prevent overheating. Setting & Configuration • Front Interface Rotary switch for Ir (FLC), Isd (SC), t6x (stall time) selection. DIP switches for Ie (EF), tE (EF delay), Iu (unbalance), etc. • PC Software Optional "PSRsoft" software for detailed configuration, monitoring, and diagnostics via USB port. Measured Values Phase currents (IL1, IL2, IL3), earth-fault current, thermal capacity used (%) Output Contacts • Trip Relay (CO) 1 Changeover contact, for tripping the circuit breaker/contactor. • Signal Relay 1 (CO) 1 Changeover contact, typically pre-assigned to Thermal Alarm. • Signal Relay 2 (CO) 1 Changeover contact, programmable for various alarms (e.g., Unbalance, Earth Fault). • Binary Inputs 2 inputs: Programmable for functions like Reset, General Alarm, Undercurrent Enable. Communication (Optional) Can be equipped with plug-in communication modules for: Modbus RTU (RS485), Profibus DP, DeviceNet. Human-Machine Interface (HMI) 7 LED indicators (Ready, Trip, Alarm, Start, Running, Comms, General Alarm). Rotary switch and DIP switches for settings. Motor Data Memory Stores thermal state for motor restart after power loss (with optional supercapacitor). Operating Temperature -20°C to +60°C (-4°F to +140°F) Housing & Mounting Compact, modular plastic case for DIN rail mounting (standard TS35 rail). Dimensions (W x H x D) Approximately 70mm x 125mm x 121mm (single module width).