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Home » Products » Siemens Siprotec Compact Numerical Relay » 7SK81 Motor Protection Relay

7SK81 Motor Protection Relay

7SK81 Motor Protection Relay
7SK81 Motor Protection Relay
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Product Code : 7SK81
Brand Name : SIEMENS
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  • 1 Piece
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Product Description

The SIPROTEC Compact 7SK81 provides 4 low-power current transformer inputs and optionally 3 low-power voltage transformer inputs. With the same low-power current transformer (LPCT) a wide range of primary rated line currents can be covered. Objects with rated currents in the range of 40 A to 5000 A can be protected when using low-power current transformers. The following low-power current transformer ratios are suitable for the following primary current operating ranges:


·         100A/225mV for a primary operating current range of 40A 600A

·         50A/22.5mV for a primary operating current range of 200A 3000A

·         400A/225mV for a primary operating current range of 200A 2500A

·         100A/22.5mV for a primary operating current range of 400A 5000A


The SIPROTEC 7SK81 is a multi-functional motor protection relay. It is designed for protection of asynchronous motors of all sizes. The relays have all the required functions to be applied as a backup relay to a transformer differential relay. The relay provides numerous functions to respond flexibly to the system requirements and to deploy the invested capital economically. Examples for this are: exchangeable interfaces, flexible protection functions and the integrated automation level (CFC). Freely assignable LEDs and a six-line display ensure a unique and clear display of the process states. In combination with up to 9 function keys, the operating personnel can react quickly and safely in any situation. This guarantees a high operational reliability.




·         Inputs for low power VTs and CTs according IEC 61869-6 (formerly IEC 60044-7 and IEC 60044-8)

·         Removable terminal blocks

·         Binary input thresholds settable using DIGSI (3 stages)

·         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


Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Phone :+917042305105
Mr. Piyush Lalchand Rathi (Partner)
Mobile :+917042305105
Mr. Rajesh Sawale
Mobile :+917042305105