Chint NR2 25 Thermal Overload Relay

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

---

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

---

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

---

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)

---

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.