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Section 1: Introduction
This manual is applicable to the following relays:
7SR17 Motor Protection Relay
The 7SR17 range of relays integrates the protection and control elements required to provide a complete thermal
overload based protection for induction motor applications.
The 'Ordering Options' Tables summarise the features available in each model.
General Safety Precautions
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.
External Resistors
!
Where external resistors are fitted to relays, these may present a danger of electric shock or burns, if touched.
Front Cover
!
The front cover provides additional securing of the relay element within the case. The relay cover should be in
place during normal operating conditions.
©2014 Siemens Protection Devices Limited
Chapter 1) 7SR17 Rho Description Of Operation
Page 9 of 78
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