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Chint thermal overload relays with a setting current range of 135-160A (including the adjustable interval of 135-160A) are mainly available in the following 4 series, covering both old and new product lines and adapting to different installation and functional requirements:
- Core Adaptable Series & Model Overview
| Series Name | Frame Model | Setting Current Range | Core Features | Mounting Method | Adaptable Contactors |
| JR36 Series (Classic Standalone Type) | JR36-160 | 100-160A (adjustable to 135-160A) | Bimetallic strip type, phase failure protection, temperature compensation, 10A trip class | Standalone Mounting | Traditional contactors such as CJT1-100, CJT1-150 |
| NR2 Series (Mainstream Plug-in Type) | NR2-200 | 100-160A (adjustable to 135-160A) | Plug-in design, action indication, automatic/manual reset, 10A trip class | Plug-in + Standalone | NC2-160, NC2-200, etc. |
| NXR Series (KunLun New Generation) | NXR-200 | 80-160A/100-160A (adjustable to 135-160A) | Added test/stop function, upgraded protection, more stable performance | Plug-in + Standalone | Chint KunLun contactors such as NC3-160, NC3-200 |
| NR4 Series (JRS2 Industry Designation) | NR4-200 | 100-160A (adjustable to 135-160A) | Three-phase bimetallic strip, differential phase failure protection, temperature compensation, 10A trip class | Plug-in + Standalone | Universal for NC series |
- Comparison of Key Parameters of Each Series
| Comparison Item | JR36 Series | NR2 Series | NXR Series | NR4 Series |
| Rated Voltage | 690V AC/50/60Hz | 690V AC/50/60Hz | 690V AC/50/60Hz | 690V/1000V AC/50/60Hz |
| Maximum Setting Current | 160A | 630A (full series) | 630A (full series) | 180A (full series) |
| Trip Class | 10A | 10A | 10A | 10A |
| Auxiliary Contacts | 1NO+1NC (partial models) | 1NO+1NC | 1NO+1NC | 1NO+1NC |
| Functional Differences | Basic protection, simple structure | Standard functions, high market share | Comprehensive functions, new generation main product | Industry universal, strong compatibility |
| Applicable Scenarios | Renovation of old equipment, standalone mounting requirements | New construction projects, mainstream application of plug-in type | High-end projects, functional upgrade requirements | Export/industry supporting, JRS2 standard adaptation |
III. Key Points for Selection and Application
- Current Matching Principle: 135-160A is the upper adjustment limit of the 100-160A specification. Ensure the rated load current ≤ 160A and the long-term operating current ≤ 135A (a 10% margin is reserved).
- Mounting and Heat Dissipation:
Reserve ventilation space for standalone mounting and avoid enclosed environments;
When the ambient temperature ＞ 40℃, derate the load current by 10% for every 10℃ rise (e.g., 135-160A shall be derated to 121.5-144A at 50℃);
Ensure a firm snap connection with the contactor for plug-in mounting to maintain stable contact resistance.
- Replacement Recommendations:
Prioritize the NXR Series for new designs (optimal performance, complete functions);
The NR2 Series is an option for replacement of in-service equipment (good compatibility, moderate cost);
The JR36 Series is available for maintenance of old systems (direct replacement without changing the mounting method).
- Examples of Complete Markings for Common Models
JR36-160 100-160A (Chint classic standalone thermal overload relay)
NR2-200 100-160A (mainstream plug-in type, adaptable to NC2 contactors)
NXR-200 100-160A (KunLun series, new generation thermal overload relay)
NR4-200 100-160A (JRS2 industry standard, adaptable to various contactors)
Summary: Chint 135-160A thermal overload relays cover four major series: JR36 (classic), NR2 (mainstream), NXR (new generation) and NR4 (industry standard). All adopt a bimetallic strip design with phase failure protection and temperature compensation functions. Users can select the appropriate series according to mounting methods, functional requirements and budgets.
