Siemens 7SK81 Siprotec Compact Motor Protection Relay
The SIPROTEC 7SK81 Compact is a multifunctional relay designed for protection of asynchronous motors of all sizes. It supports low-power CT and VT inputs, wide current ranges from 20 A to 2500 A, flexible communication, programmable logic, and advanced redundancy protocols, ensuring reliable motor and system protection
Technical Specifications
4 current inputs (LPCT), up to 3 voltage inputs
Supported current ranges: 20 A – 2500 A
Transformer ratios: 100 A/225 mV, 300 A/225 mV, 600 A/225 mV, 1250 A/225 mV
Binary inputs/outputs configurable via DIGSI
6-line display, 9 programmable keys, assignable LEDs
USB front port, 2 additional communication ports
Integrated Ethernet switch with redundancy (RSTP, PRP, HSR)
Relay-to-relay communication via IEC 61850 GOOSE
Programmable logic with CFC
Replaceable buffer battery, removable terminals
Supported current ranges: 20 A – 2500 A
Transformer ratios: 100 A/225 mV, 300 A/225 mV, 600 A/225 mV, 1250 A/225 mV
Binary inputs/outputs configurable via DIGSI
6-line display, 9 programmable keys, assignable LEDs
USB front port, 2 additional communication ports
Integrated Ethernet switch with redundancy (RSTP, PRP, HSR)
Relay-to-relay communication via IEC 61850 GOOSE
Programmable logic with CFC
Replaceable buffer battery, removable terminals
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