nr2-25-4 chint thermal overload relay, 2.50a to 4.00a rated current

Why Choose the CHINT NR2-25-4 Thermal Overload Relay?

The CHINT NR2-25-4 is a reliable thermal overload relay designed to protect three-phase AC motors against overload conditions and phase failure. Part of the dependable CHINT NR2 thermal overload relay series, this unit is engineered for use alongside compatible CHINT contactors in industrial motor starter and control applications.

Using a proven three-phase bimetal protection mechanism, the NR2-25-4 provides stable and accurate motor protection under varying operating conditions. The relay includes adjustable current settings, temperature compensation and both manual and automatic reset functionality, helping improve motor reliability and reduce downtime in industrial environments.

With an adjustable current range of 2.5 A to 4 A, the NR2-25-4 is ideal for protecting smaller industrial motors used in conveyors, pumps, compressors and machinery control panels. Its compact plug-in format allows direct mounting onto compatible CHINT contactors for simplified installation and maintenance.

Key Advantages

• Reliable thermal overload and phase loss protection for AC motors.
• Adjustable current range from 2.5 A to 4 A.
• Compatible with CHINT NC1, NC2, NC6 and NC7 contactors.
• Integrated manual and automatic reset modes.
• Built-in trip indication and test button.
• Compact plug-in design for simple panel integration.

Key Features

• CHINT NR2 thermal overload relay series.
• 2.5 A to 4 A adjustable current setting.
• Three-phase bimetal protection design.
• Integrated phase failure protection.
• Manual and automatic reset selector.
• Temperature compensated tripping mechanism.
• Built-in 1 NO + 1 NC auxiliary contacts.
• Direct mounting onto compatible CHINT contactors.

Technical Specifications

• Manufacturer: CHINT
• Series: NR2 Thermal Overload Relay
• Model: NR2-25-4
• Product type: Thermal overload relay
• Current adjustment range: 2.5 A to 4 A
• Rated operational voltage: Up to 690 V AC
• Frequency: 50 / 60 Hz
• Tripping class: 10A
• Protection functions: Overload and phase failure protection
• Auxiliary contacts: 1 NO + 1 NC
• Reset modes: Manual / Automatic selectable
• Mounting type: Plug-in mounting
• Protection rating: IP20 when enclosed
• Compliance standard: IEC/EN 60947-4-1

Reliable Motor Protection for Industrial Applications

Thermal overload relays are designed to protect electric motors from overheating caused by excessive current draw or phase imbalance. The CHINT NR2-25-4 monitors motor current continuously and disconnects the motor circuit when overload conditions occur, helping prevent winding damage and unplanned equipment failure.

The NR2 series is widely used in industrial automation systems and motor starter assemblies where dependable protection and straightforward integration are essential. Its compact design and compatibility with CHINT contactors make it suitable for OEM machinery, control panels and industrial process equipment.

Typical Applications

• Motor starter panels and MCC assemblies.
• Industrial pumps and compressors.
• Conveyor and material handling systems.
• HVAC and ventilation equipment.
• Industrial machinery and automation systems.
• OEM electrical control panels.

Trusted by Industrial Control Engineers Worldwide

CHINT NR2 thermal overload relays are widely used in industrial motor control applications to provide dependable overload protection, improved equipment safety and reliable long-term operation.