Function and Purpose
The NR4-G series thermal overload relay (hereinafter referred to as the thermal relay) is suitable for AC motors with a frequency of 50Hz/60Hz, rated voltage of 690V, 1000V, and current (0.1-180)A for long-term or intermittent long-term operation, for overload and phase failure protection. The thermal relay has phase failure protection, temperature compensation, action indication, automatic and manual reset. This product operates reliably. The product complies with standards such as GB/T14048.4, GB/T14048.5, etc. NR4-63G is installed separately, while the other thermal relays are plug-in installed with CJX1 series AC contactors.
Detail Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| 3 Main Parameters and Technical Performance | Item | NR4-12.5G |
| Current Rating | 12.5 |
| Rated Insulation Voltage V | 690 |
| Phase Failure Protection | Yes |
| Manual and Automatic Reset | Yes |
| Temperature Compensation | Yes |
| Tripping Indicator | Yes |
| Test Button | Yes |
| Installation Method | Insert Type |
| Auxiliary Contact | 1NO+1NC |
| Rated Current A | AC-15 |
| | 220V |
| | 2.7 |
| | 380V |
| | 1.5 |
| | DC-13 |
| | 220V |
| | 0.2 |
| Conductor Cross-sectional Area mm² | Main Circuit |
| | Single-core or Stranded Wire |
| | 1-2.5 |
| | Stranded Wire with Terminal |
| | 1-2.5 |
| | Terminal Screw |
| | M4 |
| | Auxiliary Circuit |
| | Single-core or Stranded Wire |
| | 1-2.5 |
| | Stranded Wire with Terminal |
| | 1-2.5 |
| | Terminal Screw |
| | M3.5 |
| | NR4-25G |
| Current Rating | 25 |
| Rated Insulation Voltage V | 690 |
| Phase Failure Protection | Yes |
| Manual and Automatic Reset | Yes |
| Temperature Compensation | Yes |
| Tripping Indicator | Yes |
| Test Button | Yes |
| Installation Method | Insert Type |
| Auxiliary Contact | 1NO+1NC |
| Rated Current A | AC-15 |
| | 220V |
| | 2.7 |
| | 380V |
| | 1.5 |
| | DC-13 |
| | 220V |
| | 0.2 |
| Conductor Cross-sectional Area mm² | Main Circuit |
| | Single-core or Stranded Wire |
| | 1-4 |
| | Stranded Wire with Terminal |
| | 1-4 |
| | Terminal Screw |
| | M4 |
| | Auxiliary Circuit |
| | Single-core or Stranded Wire |
| | 1-2.5 |
| | Stranded Wire with Terminal |
| | 1-2.5 |
| | Terminal Screw |
| | M3.5 |
| | NR4-45G |
| Current Rating | 45 |
| Rated Insulation Voltage V | 690 |
| Phase Failure Protection | Yes |
| Manual and Automatic Reset | Yes |
| Temperature Compensation | Yes |
| Tripping Indicator | Yes |
| Test Button | Yes |
| Installation Method | Insert Type |
| Auxiliary Contact | 1NO+1NC |
| Rated Current A | AC-15 |
| | 220V |
| | 2.7 |
| | 380V |
| | 1.5 |
| | DC-13 |
| | 220V |
| /td> | 0.2 |
| Conductor cross-sectional area mm² | Main circuit |
| | Single-core or stranded wire |
| | 1.5-10 |
| | Fine stranded wire with terminal |
| | 1.5-10 |
| | Terminal screw |
| | M4 |
| | Auxiliary circuit |
| | Single-core or stranded wire |
| | 1-2.5 |
| | Fine stranded wire with terminal |
| | 1-2.5 |
| | Terminal screw |
| | M3.5 |
| | NR4-63G |
| Current rating | 63 |
| Rated insulation voltage V | 690 |
| Phase failure protection | Yes |
| Manual and automatic reset | Yes |
| Temperature compensation | Yes |
| Tripping indication | Yes |
| Test button | Yes |
| Installation method | Independent type |
| Auxiliary contacts | 1NO+1NC |
| Rated current A | AC-15 |
| | 220V |
| | 2.7 |
| | 380V |
| | 1.5 |
| | DC-13 |
| | 220V |
| | 0.2 |
| Conductor cross-sectional area mm² | Main circuit |
| | Single-core or stranded wire |
| | 1-16 |
| | Fine stranded wire with terminal |
| | 1-16 |
| | Terminal screw |
| | M5 |
| | Auxiliary circuit |
| | Single-core or stranded wire |
| | 1-2.5 |
| | Fine stranded wire with terminal |
| | 1-2.5 |
| | Terminal screw |
| | M3.5 |
| | NR4-80G |
| Current rating | 80 |
| Rated insulation voltage V | 1000 |
| Phase failure protection | Yes |
| Manual and automatic reset | Yes |
| Temperature compensation | Yes |
| Tripping indication | Yes |
| Test button | Yes |
| Installation method | Independent type |
| Auxiliary contacts | 1NO+1NC |
| Rated current A | AC-15 |
| | 220V |
| | 2.7 |
| | 380V |
| | 1.5 |
| | DC-13 |
| | 220V |
| | 0.2 |
| Conductor cross-sectional area mm² | Main circuit |
| | Single-core or stranded wire |
| | 4-35 |
| | Fine stranded wire with terminal |
| | 4-35 |
| | Terminal screw |
| | M10 |
| | Auxiliary circuit |
| | Single-core or stranded wire |
| | 1-2.5 |
| | Fine stranded wire with terminal |
| | 1-2.5 |
| | Terminal screw |
| | M3.5 |
| | NR4-180G |
| Current rating | 180 |
| Rated insulation voltage V | 1000 |
| Phase failure protection | Yes |
| Manual and automatic reset | Yes |
| Temperature Compensation | Yes |
| Tripping Indicator | Yes |
| Test Button | Yes |
| Installation Method | Independent Type |
