Siemens 3RN1 User Manual download pdf

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

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 from A to Z

SIMIREL relays

SIMIREL –

3RN1 thermistor motor protection

relay : Today, motor protection is so simple

1 2

ApplicationsMotor monitoring with PTC in thewinding:• For long starting and braking operations• For high switching frequencies• For increased ambient

Price category 101S 1) Reset by either pressing the RESET button or interrupting the power supply voltageAuto 24 AC/DC230 AC1 CO• Monostable version(

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Siemens 3RN1 User Manual