Technical Specifications
Product Type: Motor Protection Relay
Relay Application: Motor
Model / Reference: REL52121
Mounting Size: 30TE, flush mounting
Power Supply: 48–230 V AC/DC
Measuring Inputs: 6 CT phase current, 3 CT residual current, 4 VT 100/110 V
Digital Inputs (DI): 12
Digital Outputs (DO): 14
Communication Ports: 1 front USB, 1 rear RJ45, 1 rear RS485
Communication Protocols: IEC 61850 ed.1 & 2, IEC 60870‑5-101 & 103, DNP3 TCP & RTU, Modbus TCP & RTU, EtherNet/IP, DeviceNet, SPAbus
Protection Functions: Phase overcurrent, thermal overload, earth fault, breaker failure, broken conductor detection, automatic recloser, switch‑ON to fault, inrush protection, capacitor bank unbalance, overvoltage, undervoltage, synchro‑check, underfrequency, rate of change of frequency, lockout, and more
Dimensions: Height 176 mm, Width 270 mm, Depth 230 mm
Net Weight: 4.2 kg
Front Protection Degree: IP54
Power supply: 24–48 V DC
Measuring inputs: 3 LPCT, 1 CSH neutral current input, 4 LPVT
Digital I/O: 40 digital inputs, 16 digital outputs
Communication protocols: IEC 61850 Ed.1 & Ed.2, Modbus TCP, DNP3 TCP, EtherNet/IP
Cybersecurity: IEC 62443-4-2 SL1 compliant
Logic engine: Advanced programmable logic (IEC 61131 / IEC 61449)
Mounting: Withdrawable, flush or rack mounted
Protection degree: IP54 (with flush mounting frame)
Operating temperature: -40 to +70 °C
Net weight: approx. 3.5 kg
Application: Line differential protection
Power supply: 48–250 V DC / 100–230 V AC
Measuring inputs:
3 phase current inputs (CT)
1 standard neutral current input
1 sensitive neutral current input
4 voltage inputs (VT)
Digital I/O: 22 digital inputs, 14 digital outputs
Arc flash protection: Up to 6 arc sensors
Communication: Ethernet or serial modules, multimode fiber optic up to 2 km (1310 nm)
Cybersecurity: IEC 62443-4-2 compliant, secure access and communication
Mounting: Withdrawable, flush or rack mounting
Dimensions (H×W×D): 180 × 152.4 × 224 mm
Weight: 3.5 kg
Power supply: 48–250 V DC / 100–230 V AC
Measuring inputs: 3 phase CT, 1 standard neutral CT, 1 sensitive neutral CT, 4 VT
Digital inputs / outputs: 40 DI / 16 DO
Communication: IEC 61850 Ed.1 & Ed.2, Modbus TCP, DNP3 TCP, EtherNet/IP
Cybersecurity: IEC 62443-4-2 SL1, role-based access, secure communication
Mounting: Withdrawable, flush or rack-mounted
Display: LCD 128×64 with single-line diagram
Operating temperature: -40 to +65 °C
Protection degree: IP54 (front with frame)
–
