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: 24–250 V DC / 100–230 V AC
Inputs: 3 LPCT phase current, 1 CSH residual current, 4 LPVT voltage
Digital I/O: 10 DI / 8 DO
Backup Memory: Yes
Communication Ports: Front USB + rear extension port
Dimensions: 180 × 102 × 224 mm
Net Weight: 2.5 kg
Application: Universal protection
Standards: EN 60255-26, EN 60255-27, UL
Certification: Marine
