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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

SIMIREL – 1
Price category 101 2

Sommario

Pagina 1 - SIMIREL –

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

Pagina 2 - Price category 101

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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