NR2-25 Relay for NC1 / NC2 Contactor
Chint NR2-25 Thermal Overload Relay for NC1/NC2 Contactors
Chint NR2-25 is a 3-phase thermal overload relay for AC motors, offering adjustable overload and phase-loss protection, designed to mount directly with Chint NC1/NC2 contactors.
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The Chint NR2-25 Thermal Overload Relay is a 3-phase bimetallic protection relay designed for AC motor overload and phase-loss protection. Compatible with the Chint NC1, NC6, NC7, and NC2 contactor series, it offers adjustable current ranges and reliable trip characteristics for motor starters and control panels.
Key Features
Dedicated Motor Protection: Provides overload and phase loss protection for 3-phase AC motors
Direct Compatibility: Designed to mount directly on Chint NC1 / NC6 / NC7 / NC2 contactors, or on a base with accessories
Wide Current Range Options: Multiple current ranges available (e.g., 0.10–0.16 A up to 17–25 A) for different motor sizes
3-Phase Bimetal Mechanism: Electrothermal bimetal design with stable tripping characteristics
Auxiliary Contacts Included: Built-in 1 NO + 1 NC auxiliary contacts, electrically isolated for control circuits
Dual Reset Modes:Manual/Auto reset selector for flexible operation and safety
High Voltage Capability: Suitable up to 690 V AC, 50/60 Hz
Global Compliance: Conforms to IEC/EN 60947-4-1 and certified by CE, UL, KEMA, EAC, RCC, UkrSEPRO
Technical Specifications (Table)
| Parameter | Specification |
|---|---|
| Brand | Chint |
| Product Type | Thermal Overload Relay (3-phase bimetal) |
| Model | NR2-25 |
| Compatibility | Chint NC1, NC6, NC7, NC2 contactors |
| Protection Functions | Overload protection, phase loss (phase failure) protection |
| Rated Operational Voltage | Up to 690 V AC |
| Frequency | 50 / 60 Hz |
| Current Range Options | Approx. 0.10–0.16 A up to 17–25 A (multiple variants) |
| Trip Mechanism | Electrothermic 3-phase bimetal mechanism |
| Auxiliary Contacts | 1 NO + 1 NC, electrically isolated |
| Reset Mode | Manual/Automatic selectable |
| Installation | Plug-in/bolt-on mounting to contactor or separate base |
| Applicable Standards | IEC/EN 60947-4-1 |
| Certifications | CE, UL, KEMA, EAC, RCC, UkrSEPRO (as per manufacturer) |
| Typical Application | Motor starters, DOL/Star-Delta panels, small MCCs |
| Series | NR2 Series |
Applications
DOL and Star–Delta motor starters
Motor control centers (MCC) and starter panels
Pump, blower and compressor panels
Conveyor, crane and hoist motor circuits
General industrial control panels requiring motor overload protection
What’s in the Box?
1 × Chint NR2-25 Thermal Overload Relay (current range as ordered)
Mounting interface for NC1/NC2 contactor or base (as per model)
Basic product leaflet/rating label (as supplied by manufacturer)
FAQ
Q1. What is the main function of the NR2-25 thermal overload relay?
It protects AC motors against overload and phase loss, tripping the motor starter when current exceeds the set value for a defined time.
Q2. Which contactors are compatible with NR2-25?
The NR2-25 is designed for direct use with Chint NC1, NC6, NC7, and NC2 series contactors, either as a plug-in or bolt-on unit.
Q3. What current ranges are available in NR2-25?
NR2-25 is available in multiple adjustable ranges, for example, 0.10–0.16A, 1.6–2.5A, 7–10A, 17–25A, etc. You should select the range according to the motor's full-load current.
Q4. Does NR2-25 support both manual and auto reset?
Yes. It includes a manual/auto reset selector, allowing either automatic reclosure after cooling or manual reset for higher safety.
Q5. Can I mount the NR2-25 independently without a contactor?
Yes, with appropriate mounting accessories/base, it can also be used as a stand-alone overload relay in the panel.
Q6. Is the auxiliary contact isolated from the power circuit?
Yes, the 1 NO + 1 NC auxiliary contacts are electrically isolated, suitable for signaling or interlock circuits.