7SR105 Rho Description of Operation
©2018 Siemens Protection Devices Chapter 1 Page 6 of 57
Section 1: Introduction
This manual is applicable to the following relay:
• 7SR105 Rho Motor Protection relay
General Safety Precautions
1.1 Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel or damage to equipment.
1.2 External Resistors
Where external resistors are connected to the relay circuitry, these may present a danger of electric
shock or burns, if touched.
1.3 Description
The 7SR105 Rho Motor Protection Relay is developed by using the latest generation of hardware technology.
7SR105 is a member of Siemens Reyrolle
®
protection devices Rho product family.
The 7SR105 Rho Motor Protection Relay is housed in a 4U high, size 4 non draw-out case and these relays
provide protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging
and fault reports.
Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical
RS485 (optional) port for remote connection.
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