Interruptor de protección de arranque de motor Chint NS2-25/4-6.3A

Chint NS2-25/4-6.3A is a starter protection switch specifically designed for three-phase squirrel-cage induction motors. It integrates the functions of a cortacircuitos and a thermal relay, providing overload protection, phase failure protection, protección contra cortocircuitos, and infrequent starting control.

Interpretación del modelo:

NS2: código de serie (N stands for Chint, S stands for Starter)

25: Frame current rating (25A)

4-6.3A: Rated current range of the trip unit (adjustable within 4-6.3A)

1. Parámetros técnicos básicos

III. Functional Features

1. Múltiples funciones de protección

Protección contra sobrecarga: Built-in bimetallic thermal element acts when the current exceeds the setting current for a certain period, preventing motor burnout due to overheating.

Phase Failure Protection: Detects the loss of any phase in the three-phase power supply and immediately cuts off the circuit to protect the motor.

Protección contra cortocircuitos: Instantaneous electromagnetic trip unit operates rapidly (≤100ms) when the current reaches 78A, preventing the expansion of short-circuit faults.

Función de aislamiento: Can be used as an isolating switch to ensure maintenance safety.

2. Funciones de control

– Integrates start/stop button control with a compact structure.

– Supports 35mm standard DIN rail mounting for quick deployment.

– Optional accessories available: Undervoltage Trip (UV), Viaje de derivación (SH), Contacto auxiliar (AE/AU), Fault Signal Contact (FA).

1. Escenarios de aplicación

NS2-25/4-6.3A is suitable for:

– Protection and control of three-phase induction motors with a power of approximately 2.2kW (400V).

– Control of small and medium-sized motors in factories and workshops, como los fanáticos, bombas de agua, transportadores, compresores, y otros equipos.

– Motor control cabinets in building automation systems.

– Can replace the traditional circuit breaker + thermal relay combination scheme, saving space and costs.

1. Precauciones de uso
2. Requisitos de instalación

– Install vertically with an inclination angle ≤±5° to ensure reliable operation.

– The tightening torque for the terminal screws (M4) is 1.7N·m; avoid over-tightening to prevent thread damage.

– Área de sección transversal de cable recomendada: 1~6mm², wire stripping length: 10milímetros.

2. Configuración de parámetros

Configuración actual: Should be adjusted to 1.05~1.1 times the motor’s rated current to ensure protection sensitivity and avoid false tripping.

– When the ambient temperature deviates significantly from 25℃, adjust the setting current according to the temperature compensation characteristic table.

3. Operating Restrictions

– Do not operate beyond the rated voltage or frequency.

– The operating frequency shall not exceed 30 times/hour; frequent operation will shorten the service life.

– It is strictly prohibited to disassemble or replace parts with live electricity; the power supply must be cut off first and confirmed to be de-energized.

1. Selection Reference

To select the appropriate NS2 series product for your motor:

1. First determine the motor’s rated current.
2. Choose a model whose setting current range includes the motor’s rated current.
3. Motor power reference: NS2-25/4-6.3A is suitable for motors with a power of approximately 2.2kW (400V).
4. In systems with high-order harmonics such as inverter power supply, it is recommended to select the specification according to 1.3~1.9 times the motor’s rated current.

Resumen

Chint NS2-25/4-6.3A is a reliable-performance motor starter protection switch that integrates protection and control functions. It is particularly suitable for three-phase induction motors of around 2.2kW. Not only can it effectively protect motors from overload, falla de fase, and short-circuit damage, but it also simplifies the design of control systems, making it an ideal choice in the field of industrial electrical control.