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