Siemens 3RN1 - User Manual
Siemens 3RN1 – User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Applications
Motor monitoring with PTC in the
winding:
• For long starting and braking
operations
• For high switching frequencies
• For increased ambient tempera-
tures
• When the cooling medium flow
is restricted
• For AC drive operation
Highlights
• All products are PTB-ATEX
certified
• Wire breakage and short circuit
in the sensor circuit are displayed
• Versions with hard-gold-plated
relays which are electronics
compatible
• Favorably priced compact device
(A1 + 11 jumpered)
• Either screw or cage clamp termi-
nal connection system
S
The power and lifetime of motors is essentially limited by the winding temperature. Motor
manufacturers integrate PTC sensors in the motor winding if more stringent requirements prevail – e. g.
for high ambient temperatures or where cooling is restricted. The thermistor motor protection devices
operate according to the closed-circuit principle, detect these limit temperatures and switch the output
relay contacts.
Electrical Engineering
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om A t
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S I M I R E L r e l a y s
S I M I R E L –
3 R N 1 t h e r m i s t o r m o t o r p r o t e c t i o n
r e l a y : Today, motor protection is so simple
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