Instantaneous Overcurrent – Phase (50)
Line Check / Switch-On-to-Fault (SOTF) (50)
Instantaneous Earth Fault – Derived (50N)
Time-Delayed Overcurrent – Phase (51)
Time-Delayed Earth Fault – Derived (51N)
Two Independent Settings Groups
Supervision Functions:
Inrush Current Detection (81HBL2) for transformer and network stability
Ancillary Functions:
High-Speed Trip via Binary Input (49T)
High-Speed Trip via External Trip Initiation (49T)
Lockout Function for Enhanced System Security (86)
Optimized for pump & fan applications in water/wastewater & HVAC
Power range: 0.75 kW … 630 kW
Supports all supply voltages & global EMC standards
Motor cable length: up to 150 m with EMC compliance
Safety Integrated: STO (SIL3 certified)
Rugged design; optional drip-water protection; 3C3 environmental class
Cloud-ready via SIMATIC FDE, SIMATIC S7-1200/1500, or IOT2040
Special functions: deragging, pipe filling, cavitation detection, multipump, flying restart, bypass critical motor speeds, real-time clock
Suitable for Siemens synchronous-reluctance motors and all standard motors
Simple commissioning: IOP-2, Smart Access Module
HVAC & water application libraries included
Inputs: 4xI and 4xV
Display: 8-line text or graphical LCD
Protection Functions:
Overcurrent protection (non-directional and directional)
Motor protection and monitoring
Earth-fault protection
Thermal overload and undercurrent protection
Voltage and frequency protection
Circuit-breaker failure protection
Negative-sequence protection
Control & Logic:
Control of CBs and isolators via keyboard, binary inputs, DIGSI 4, or SCADA
Graphical visualization of switch positions
User-defined logic using CFC (interlocking, sequences, etc.)
Monitoring Functions:
Operational measured values (V, I, f)
Energy metering (Wp, Wq)
Circuit-breaker wear monitoring
Trip circuit supervision
Fuse failure monitor
8 oscillographic fault records
Motor statistics
Communication Interfaces:
IEC 61850, IEC 60870-5-103, Modbus RTU, DNP3
Electrical & optical ports, RSTP Ethernet redundancy
Front USB & service interfaces for DIGSI 4
Time sync: IRIG B, DCF77
Languages: English, Spanish, Russian, Polish, Turkish
Proven SIPROTEC 4 technology for protection, control, and automation
