Pronto Energy 
KNR1 Thermal Overload Relay
The KNR1 thermal overload relay protects motors from overload, phase loss and long-start faults. It provides adjustable current settings from 0.1-93A, working with contactors for complete motor protection.
Applications & circuit protection
The KNR1 thermal overload relay is designed for motor protection in industrial applications, offering adjustable trip settings and manual or automatic reset.
- Motor overload protection
- Phase-loss protection
- Combination with AC contactors
- Industrial motor control panels
Construction & operating reliability
The KNR1 uses a bimetallic trip mechanism with adjustable current setting, test and reset functions, and a compact design for panel mounting.
- Adjustable current setting range
- Overload and phase-loss protection
- Test, trip and reset functions
- Compatible with standard contactors
Technical Parameter
| Parameter | Value |
| Application | Motor overload and phase-loss protection |
| Rated working current | 0.1–93 A |
| Rated insulation voltage — main circuit | 660 V |
| Rated insulation voltage — auxiliary circuit | 500 V |
| Rated frequency | 50/60 Hz |
| Auxiliary contacts | 1 NO + 1 NC |
| Compatible contactor | KNC1 series |
Standards & certifications
The KNR1 is designed in accordance with IEC/EN 60947-4-1 and is available with CE, CCC certifications. Certification documentation can be provided according to project and destination-market requirements.
- Standard: IEC/EN 60947-4-1.
- Certifications: CE, CCC.
- Protection level: IP20 (where applicable).
OEM & B2B supply support
KORLEN supports distributors, OEM manufacturers, electrical contractors and project buyers with product selection, samples, technical documentation and commercial quotations.
If the KNR1 configuration does not match your project, send us the required specifications, quantity and destination market. Our team can help identify a suitable configuration.
- Samples available for product evaluation.
- Flexible quantities for project and B2B purchasing.
- OEM and ODM support for suitable projects.
- Technical documentation and certification support available.
Frequently Asked Questions
The KNR1 protects AC motors from overload and phase-loss faults, working with a contactor for complete motor control.
The KNR1 covers 0.1-93A with a dial-adjustable trip setting.
It senses motor current through a bimetallic mechanism and trips when overload or phase loss is detected.
Manual and automatic reset modes are available, selectable on the relay.