nr2-25-18 chint thermal overload relay, 12a to 18a rated current

Why Choose the CHINT NR2-25-18 Thermal Overload Relay?

The CHINT NR2-25-18 is a reliable thermal overload relay designed to protect three-phase AC motors from overload, stalled rotor and phase failure conditions in industrial automation and motor control systems. Part of the proven CHINT NR2 thermal overload relay series, this relay provides dependable motor protection for machinery, process equipment and electrical control panels.

Using a precision bimetal thermal tripping mechanism, the NR2-25-18 continuously monitors motor current and disconnects the circuit when unsafe operating conditions are detected. Its temperature compensated operation and integrated phase loss sensitivity help improve motor reliability while reducing maintenance costs and unplanned downtime.

With an adjustable current range of 13 A to 18 A, the NR2-25-18 is suitable for protecting industrial motors used in conveyors, compressors, pumps, fans and manufacturing equipment. The relay is engineered for direct installation onto compatible CHINT contactors, allowing compact and efficient motor starter assemblies.

Key Advantages

• Reliable thermal overload and phase failure protection.
• Adjustable current range from 13 A to 18 A.
• Compatible with CHINT NC1 contactor series.
• Integrated manual and automatic reset operation.
• Compact design for industrial motor control applications.
• Temperature compensated tripping improves operational stability.

Key Features

• CHINT NR2 thermal overload relay series.
• 13 A to 18 A adjustable overload current setting.
• Three-phase thermal bimetal protection.
• Integrated phase loss sensitivity.
• STOP and TEST push buttons.
• Manual and automatic reset selector.
• 1 NO + 1 NC auxiliary contacts.
• Direct mounting onto compatible CHINT contactors.

Technical Specifications

• Manufacturer: CHINT
• Series: NR2 Thermal Overload Relay
• Model: NR2-25-18
• Product type: Thermal overload relay
• Current adjustment range: 13 A to 18 A
• Rated insulation voltage: 690 V AC
• Frequency: 50 / 60 Hz
• Tripping class: Class 10A
• Protection functions: Overload and phase failure protection
• Auxiliary contacts: 1 NO + 1 NC
• Reset mode: Manual / Automatic selectable
• Mounting type: Direct contactor mounting
• Protection rating: IP20 when installed
• Compliance standards: IEC/EN 60947-4-1

Reliable Protection for Industrial Motor Systems

Thermal overload relays are essential for protecting electric motors against overheating caused by excessive current draw, mechanical overload or phase imbalance. The CHINT NR2-25-18 continuously monitors motor operating current and trips the connected contactor when overload conditions occur.

The NR2 series is widely used in industrial automation systems, motor control centres and OEM machinery where dependable motor protection and compact installation are required. Its direct mounting format simplifies panel assembly and ongoing maintenance.

Typical Applications

• Industrial motor starter assemblies.
• Conveyor and material handling systems.
• Pumps, compressors and ventilation equipment.
• Manufacturing and processing machinery.
• HVAC motor protection systems.
• OEM automation and industrial control applications.

Trusted by Industrial Engineers Worldwide

CHINT NR2 thermal overload relays are widely used in industrial automation and machinery applications to provide dependable overload protection and reliable long-term motor performance.