Function and Usage
The NXR series thermal overload relay (hereinafter referred to as the thermal relay) is suitable for AC motors with AC 50Hz/60Hz, voltage up to 690V, and set current 0.1~630A for long-term or intermittent operation, for overload and phase failure protection. ● The thermal relay also has temperature compensation, action indication, automatic and manual reset, stop and test functions, and the product performance is stable and reliable. The thermal relay can be installed by plug-in with a contactor or independently. ● Conforms to standards: GB/T 14048.4/IEC 60947-4-1, GB/T 14048.5/IEC 60947-5-1.
Detailed Description
Parameters:
Set current range: 0.1~630A
Tripping level: 10A
Installation method: Plug-in installation, independent installation
Advantages/Core Functions:
01 6 frame currents
Complete specifications, easier selection
02 Wide set current range
Can meet more load matching
03 Electronic design
Accurate and reliable operation, preventing relay misoperation
04 Integrated structure
More durable
Detailed Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| Item | NXR-R12 | 12 25 38 100 200 630 |
| Rated Insulation Voltage V | 690 | 690 690 690 690 690 |
| Rated Impulse Withstand Voltage V | Main Circuit | 8000 8000 8000 8000 8000 8000 |
| Auxiliary Circuit | 6000 6000 6000 6000 6000 6000 |
| Enclosure Protection Level | IP20 (front side) | IP20 (front side) IP20 (front side) IP20 (front side) IP00 IP00 |
| Phase Failure Protection | Yes | Yes Yes Yes Yes Yes |
| Manual and Automatic Reset | Yes | Yes Yes Yes Manual Manual |
| Temperature Compensation | Yes | Yes Yes Yes Yes Yes |
| Tripping Indication | Yes | Yes Yes Yes Yes Yes |
| Test Button | Yes | Yes Yes Yes Yes Yes |
| Stop Button | Yes | Yes Yes Yes Yes Yes |
| Installation Method | Plug-in Type | Plug-in Type Plug-in Type Plug-in Type Independent Type Independent Type |
| Self-contained Auxiliary Contact | 1NO+1NC | 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC |
| AC-15 380V/400V Rated Current A | 1.5 | 1.5 1.5 1.5 1.5 1.5 |
| DC-13 220V Rated Current A | 0.2 | 0.2 0.2 0.2 0.2 0.2 |
| Conductor Cross-sectional Area mm² | Main Circuit | Single-core or stranded wire 1-4 1-6 4-10 4-35 25-95 50-2×185 |
| | Wiring Screw M3.5 M4 M4 M10 M8 M10 |
| | Tightening Torque (N·m) 1.2 1.7 1.7 10 10 20 |
| Auxiliary Circuit | Single-core or stranded wire 1-2.5 1-2.5 1-2.5 1-2.5 1-2.5 1-2.5 |
| | Wiring Screw M3.5 M3.5 M3.5 M3.5 M3.5 M3.5 |
| | Tightening Torque (N·m) 0.8 0.8 0.8 0.8 1.2 1.2 |
| Parameter Category | Serial Number | Set Current Multiplier Action Time Test Conditions |
| Overload Protection | 1 | 1.05 No action within 2 hours Starting from cold state |
| 2 | 1.2 Action within 2 hours Starting from hot state (after serial number 1) |
| 3 | 1.5 Action within 2 minutes Starting after reaching thermal equilibrium at set current |
| 4 | 7.2 2s≤Tp≤10s Starting from cold state |
| Phase Failure Protection | 5 | Any two phases The third phase No action within 2 hours Starting from cold state |
| 6 | 1.0 0.9 Action within 2 hours Starting from hot state (after serial number 5) |
