Siemens 3RN1 User Manual
Applications
Motor monitoring with PTC in the
winding:
• For long starting and braking
operations
• For high switching frequencies
• For increased ambient temperatures
• 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 terminal connection system
SIMIREL –
3RN1 thermistor motor protection
relay : Today, motor protection is so simple
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.
SIMIREL relays
Electrical Engineering from A to Z
SIMIREL 3RN1 thermistor motor protection for PTC thermistor temperature sensors
Screw connection
Thermistor motor protection
relays for PTC thermistors
(type A PTCs)
• Monostable version
(closed-circuit principle),
trips when the control
voltage fails
• All relays (with
AC/DC 24 V)
have electrical
isolation
• 22.5 mm wide
Compact evaluation devices, 1 LED
Terminal A1 is connected to the
common of the changeover contact
Standard evaluation devices, 2 LEDs
Short-circuit detection in the sensor circuit
Holding on supply failure fct.
Holding on supply failure fct.,
short-circuits in the sensor circuit are
displayed
Holding on supply failure fct.
short-circuits and wire
breakage in the sensor circuit are detected
RESET Contacts Power supply
voltage V
50/60 Hz V AC
Auto 24 AC/DC
1 CO
s
230 AC
Auto
1 NO + 1 NC
24 AC/DC
230 AC
2 CO
24 AC/DC
230 AC
1)
Manual/Remote
1 NO + 1 NC
24 AC/DC
110/230 AC
Manual/Remote
1)
2 CO
24 AC/DC
230 AC
Manual/Auto/Remote
1 NO + 1 NC
24 AC/DC
110/230 AC
Manual/Auto/Remote
Manual/Auto/Remote
2 CO
2 CO
2 CO, hard-gold-plated
2 CO
24 AC/DC
230 AC
24 AC/DC
24 AC/DC
24–240 AC/DC
2 CO, hard-gold-plated
1) Reset by either pressing the RESET button or interrupting the power supply voltage
24–240 AC/DC
Order No.
3RN10 00-1AB00
3RN10 00-1AM00
3RN10 10-1CB00
3RN10 10-1CM00
3RN10 10-1BB00
3RN10 10-1BM00
3RN10 11-1CB00
3RN10 11-1CK00
3RN10 11-1BB00
3RN10 11-1BM00
3RN10 12-1CB00
3RN10 12-1CK00
3RN10 12-1BB00
3RN10 12-1BM00
3RN10 12-1GB00
3RN10 13-1BB00
3RN10 13-1BW10
3RN10 13-1GW10
www.siemens.com/simirel
Automation and Drives
Partner des Elektro-Großhandels
Werner-von-Siemens-Str. 50
D-91050 Erlangen, Germany
Siemens AG
Price category 101
The information provided in this brochure contains merely general descriptions
or characteristics of performance which in case of actual use do not always apply
as described or which may change as a result of further development of the
products. An obligation to provide the respective characteristics shall only exist
if expressly agreed in the terms of contract.
© Siemens AG 2003
Subject to change without prior notice 07/03
Order No. E20001-A660-M102-X-7600
Printed in Germany
DISPO 18101
21C7977 EGCD.52 3.05 SB 070325.0
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