7SR105 Rho Performance Specification
© 2018 Siemens Protection Devices Chapter 3 Page 7 of 17
1.3 Environmental Performance
This section describes about the environmental tests performed with 7SR105 Rho Motor Protection Relay under
different conditions.
Table 1-13 Mechanical Tests
Type Test Reference Requirement
Vibration
IEC 60255-21-1 Response, Class I
Endurance, Class I
Shock and Bump
IEC 60255-21-2
Shock response, Class I
Shock withstand, Class I
Bump, Class I
Degree of Protection
IEC 60529
IP54 front
IP20 back
Seismic IEC 60255-21-3,
Class I
In single axis sine sweep in X-axis
Sweep (@a sweep rate of 1 octave/min) vibration
in the frequency range
(1 Hz to 35 Hz) at amplitude of 3.5 mm or 1.0 gn
(whichever is less)
In single axis sine sweep in Y-axis: sweep (@a
sweep rate of 1 octave/min) vibration in the
frequency range (1 Hz to 35 Hz) at amplitude of
1.5 mm or 0.5 gn (whichever is less)
Contact
IEC 60255-1
(Ref: Std IEC 61810-1)
Making capacity, Make and carry capacity,
Breaking capacity
Electrical Endurance
Test
IEC 60255-1
(Ref: Std IEC 61810-1)
10000 operations at 250 V, 5 A
Table 1-14 Electrical Tests
Type Test Reference Requirement
Insulation Resistance IEC 60255-27
#
Insulation resistance >100 M Ohms at 500 V DC
Test Duration: > 5 s
Impulse Voltage
Withstand
IEC 60255-27
5 kV, 1.2/50 µs, 0.5 J
5 +ve, -ve pulses
Between all terminals and case earth and any
two independent circuits.
Hi Voltage (Dielectric)
Voltage
IEC 60255-27
• All case terminals connected together 2.0 kV
AC RMS, 50 Hz, 1 min between terminals of
independent circuits
• 1.0 kV AC RMS, 1 min across normally open
contacts
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