Chint NR2 25 Thermal Overload Relay
Chint NR2-25 Thermal Overload Relay, 17–25A, 3-Pole, NC1/NC2 Compatible
3-pole bimetal thermal overload relay with 17–25A adjustable range for AC motor protection. Provides overload and phase failure protection, with 1NO+1NC auxiliary contacts and direct mounting on Chint NC1/NC2 contactors.
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Chint NR2-25 is a 3-pole bimetal thermal overload relay designed for AC motor protection in the 17–25A current range. It provides overload and phase failure protection, integrates directly with Chint NC1/NC2 contactors, and includes 1NO+1NC auxiliary contacts for control and indication circuits.
Key Features
3-pole thermal overload relay for AC motor protection
Adjustable current range 17–25A (other NR2-25 variants cover 0.1–25A)
Protects against overload and phase failure
Tripping class 10A for timely response under overload conditions
Manual/auto reset selection for operational flexibility
1NO + 1NC electrically isolated auxiliary contacts for control and signalling
Direct plug-in mounting on Chint NC1 and NC2 contactors or independent mounting with accessories
Rated operational voltage up to 690V AC, 50/60 Hz
Bimetal technology with temperature compensation and trip indication
Complies with IEC/EN 60947-4-1 and certified CE, UL, KEMA
3-pole thermal overload relay for AC motor protection
Adjustable current range 17–25A (other NR2-25 variants cover 0.1–25A)
Protects against overload and phase failure
Tripping class 10A for timely response under overload conditions
Manual/auto reset selection for operational flexibility
1NO + 1NC electrically isolated auxiliary contacts for control and signalling
Direct plug-in mounting on Chint NC1 and NC2 contactors or independent mounting with accessories
Rated operational voltage up to 690V AC, 50/60 Hz
Bimetal technology with temperature compensation and trip indication
Complies with IEC/EN 60947-4-1 and certified CE, UL, KEMA
Technical Specifications
Parameter Value Model NR2-25 (17–25A variant) Brand Chint Product Type Thermal Overload Relay Protection Type Overload and phase failure Number of Poles 3-Pole Adjustable Current Range 17–25 A Available NR2-25 Ranges 0.10–0.16A to 17–25A (multiple variants) Tripping Class Class 10A Auxiliary Contacts 1 NO + 1 NC (electrically isolated) Reset Modes Manual / Automatic Rated Operational Voltage Up to 690 V AC Frequency 50 / 60 Hz Mounting Direct to NC1/NC2 contactors or separate with kit Relay Type Bimetal thermal Standards Compliance IEC/EN 60947-4-1, CE, UL, KEMA Indication Trip indication and test button Operating Function Motor overload and phase-loss protection Approx. Dimensions (L × W × H) ~8 × 5 × 9 cm Approx. Weight ~0.25 kg
| Parameter | Value |
|---|---|
| Model | NR2-25 (17–25A variant) |
| Brand | Chint |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload and phase failure |
| Number of Poles | 3-Pole |
| Adjustable Current Range | 17–25 A |
| Available NR2-25 Ranges | 0.10–0.16A to 17–25A (multiple variants) |
| Tripping Class | Class 10A |
| Auxiliary Contacts | 1 NO + 1 NC (electrically isolated) |
| Reset Modes | Manual / Automatic |
| Rated Operational Voltage | Up to 690 V AC |
| Frequency | 50 / 60 Hz |
| Mounting | Direct to NC1/NC2 contactors or separate with kit |
| Relay Type | Bimetal thermal |
| Standards Compliance | IEC/EN 60947-4-1, CE, UL, KEMA |
| Indication | Trip indication and test button |
| Operating Function | Motor overload and phase-loss protection |
| Approx. Dimensions (L × W × H) | ~8 × 5 × 9 cm |
| Approx. Weight | ~0.25 kg |
Applications
Protection of three-phase induction motors in industrial plants
Motor starters using Chint NC1/NC2 contactors
Pumps, compressors, fans and conveyor drives
HVAC and process equipment motor protection
General motor control panels and MCCs requiring thermal overload protection
Protection of three-phase induction motors in industrial plants
Motor starters using Chint NC1/NC2 contactors
Pumps, compressors, fans and conveyor drives
HVAC and process equipment motor protection
General motor control panels and MCCs requiring thermal overload protection
What’s in the Box?
1 × Chint NR2-25 Thermal Overload Relay (17–25A range)
Integrated 1NO+1NC auxiliary contact block
Front reset and test controls (as per model design)
Basic mounting/wiring information from manufacturer (if supplied)
1 × Chint NR2-25 Thermal Overload Relay (17–25A range)
Integrated 1NO+1NC auxiliary contact block
Front reset and test controls (as per model design)
Basic mounting/wiring information from manufacturer (if supplied)
FAQ
Q1. What motor range does the NR2-25 (17–25A) cover?
A1. This NR2-25 variant covers 17–25A, suitable for motors whose full load current falls in this range. Selection depends on motor FLC and service conditions.
Q2. Can NR2-25 be mounted directly on contactors?
A2. Yes. It is designed for direct plug-in mounting on Chint NC1 and NC2 contactors and can also be mounted separately with suitable accessories.
Q3. What kind of protection does it provide?
A3. It provides thermal overload protection and phase failure (phase-loss) protection for 3-phase motors.
Q4. What auxiliary contacts are available?
A4. The relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contact, electrically isolated, for signalling, interlocking, or trip indication.
Q5. What is the tripping class of NR2-25?
A5. It typically has a tripping class of 10A, which gives a defined trip time under overload conditions suitable for standard motor applications.
Q6. Can I switch between manual and auto reset?
A6. Yes, the NR2-25 relay provides manual and automatic reset options selectable on the device.