INT69 Motor protection relay

Motor protection based on PTC sensors represents one of the most effective and reliable protective measures against thermal overload of electrical machines. The protection device consists of the INT69 motor protector and the PTC sensors. Due to its compact design, the INT69 is suitable for installation in electrical devices or the terminal box of electrical machines.

Function of an INT69 motor protection relay

Depending on the device version, up to nine PTC sensors to DIN 44081, DIN 44082, also with different nominal response temperatures, can be connected to the measuring circuit input of an INT69 motor protection relay. It is therefore possible to monitor several measuring points with just one INT69 motor protector.

If the temperature in one of the parts or sections to be monitored reaches the nominal response temperature of the respective PTC sensor, the sensor becomes highly resistive, and the tripping device switches off.

Motorschutzrelais von Kriwan

Advantages INT69 motor protection relay

Maximum safety in temperature monitoring with two evaluation methods

PTC Kennlinie vom Motorschutzrelais


Static temperature monitoring

When the nominal response temperature of the installed AMS or PTC sensors is reached, the system is switched off without delay.


Dynamic temperature monitoring

If the temperature rises unusually quickly, the motor is switched off immediately, even if it is still far below the nominal response temperature. This prevents high temperature overflows.

The right INT69 motor protection relay for every application

KRIWAN INT69 motor protection relay

KRIWAN offers a wide range of INT69 motor protection relays with different technical specifications. In the following table you will find a small selection of our INT69 motor protection relays.

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The most commonly used triggering devices

INT69 Trigger unit INT69 Diagnose INT69Y Diagnose
Article number 22A460 22A481 22A630
Restart delay no yes yes
Run detection no yes yes
Input hot gas PTC no yes no
Phase monitoring no no yes
Temperature measuring circuit 1-9 PTC according to DIN 44081, DIN 44082 in series 1-2 AMS sensors in series alternatively 1-9 PTC according to DIN 44081, DIN 44082 in series
Protection class IP20 IP00
Interface no Diagnose Port
Approval UL


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