Power supply: 24–48 V DC
Current inputs: 3 phase CT + 1 residual CT
Digital inputs / outputs: 16 DI / 8 DO
Communication ports: 1× RS485 (rear), 1× USB (front)
Supported protocols: IEC 60870-5-101/103, DNP3, Modbus RTU, DeviceNet, SPAbus
Protection functions: Overcurrent, earth fault, breaker failure, recloser, SOTF, inrush protection, motor protection
Mounting type: Flush mounting (30TE)
Display: LCD 128×64 with single-line diagram
Operating temperature: -40 to +65 °C
Front protection rating: IP54
Product Type: Protection Relay
Relay Application: Universal
Reference / Model: REL52056
Mounting Size: 30TE, flush mounting
Power Supply: 48–230 V AC/DC
Measuring Inputs: 3 CT phase current, 1 CT residual current, 4 VT 100/110 V
Digital Inputs (DI): 16
Digital Outputs (DO): 8
Communication Ports: 2 rear RJ45, 1 front USB
Communication Protocols: IEC 61850 ed.1 & 2, IEC 60870‑5‑101, DNP3 TCP, Modbus TCP, EtherNet/IP
Protection Functions: Phase overcurrent, overload, earth fault, breaker failure, broken conductor detection, inrush protection, automatic recloser, switch‑ON to fault (SOTF), etc.
Dimensions: Height 169.5 mm, Width 170 mm, Depth 205 mm
Net Weight: 2.5 kg
Front Protection Degree: IP54
Conformal coating available (NEW)
Pluggable current and voltage terminals
Binary input thresholds settable using DIGSI (3 stages)
Secondary current transformer values (1 A / 5 A) settable using DIGSI
9 programmable function keys
6-line display
Buffer battery exchangeable from the front
USB front port
2 additional communication ports
Integrated switch for low-cost and redundant optical Ethernet rings
Ethernet redundancy protocols RSTP, PRP, and HSR for highest availability
Relay-to-relay communication through Ethernet with IEC 61850 GOOSE
Millisecond-accurate time synchronization through Ethernet with SNTP
Number of binary inputs and binary outputs by a connection from up to two SICAM I/O-Units extendable.
Protection Functions:
Overcurrent protection (50, 50N, 51, 51N)
Directional time-overcurrent protection (67, 67N)
Sensitive dir. ground-fault detection (67Ns)
High-impedance restricted ground fault (87N)
Undercurrent monitoring (37)
Overload protection (49)
Under-/overvoltage protection (27/59)
Frequency protection (81O/U)
Breaker failure protection (50BF)
Negative-sequence protection (46)
Synch-check (25)
Auto-reclosure (79)
Fault locator (21FL)
Lockout (86)
Control Functions/Programmable Logic:
Commands for control of CB, disconnect switches (isolators/isolating switches)
Control through a keyboard, binary inputs, DIGSI 4, or SCADA system
User-defined PLC logic with CFC (e.g. interlocking)
Monitoring Functions:
Operational measured values V, I, f
Energy metering values Wp, Wq
Circuit-breaker wear monitoring
Minimum and maximum values
Trip circuit supervision (74TC)
Fuse failure monitor
8 oscillographic fault records
Communication Interfaces:
System/service interface
IEC 61850 Edition 1 and 2
IEC 60870-5-103 and IEC 60870-5-104
PROFIBUS-DP
DNP 3.0
MODBUS RTU
DNP3 TCP
PROFINET
Ethernet redundancy protocols RSTP, PRP, and HSR
Hardware:
4 current transformers
0/3 voltage transformers
3/7 binary inputs (thresholds
