친트 CJX2-6511+NR2-93

Technical File of Chint CJX2-6511 + NR2-93

Chint CJX2-6511 + NR2-93 is a standard electromagnetic starter combination, consisting of a CJX2-6511 AC 접촉기 and an NR2-93 thermal overload relay. It is mainly used for remote control, overload and phase failure protection of AC motors, and is widely applied in industrial automation and electrical control systems.

1. 모델 해석

1. 핵심 기술 매개변수
2. CJX2-6511 AC Contactor

2. NR2-93 Thermal Overload Relay

III. 기능적 특징

1. Features of CJX2-6511 Contactor

High-performance Contacts: Silver alloy contacts with excellent conductivity, strong arc erosion resistance and long service life.

Low-noise Design: Optimized electromagnetic system to reduce noise during pull-in and release.

모듈형 구조: Expandable auxiliary contacts for flexible installation.

안전하고 신뢰할 수 있는: GB/T를 준수합니다. 14048.4 and IEC/EN 60947-4-1 표준, with short-circuit protection coordination capability.

넓은 전압 적응성: Control coil is compatible with multiple voltage levels to meet the requirements of different control circuits.

2. Features of NR2-93 Thermal Overload Relay

포괄적인 보호: Provides both overload and phase failure protection to prevent motor burnout due to phase loss operation.

온도 보상: Maintains stable protection characteristics when ambient temperature changes.

Action Indication: Clear trip status indication for easy fault troubleshooting.

Flexible Reset: Manual/automatic reset selection to adapt to different control requirements.

Plug-in Mounting: Perfectly matched with CJX2 contactor for quick installation and space saving.

3. Advantages of the Combined System

Integrated Control and Protection: The contactor is responsible for circuit on/off and motor starting, while the thermal overload relay provides overload/phase failure protection, forming a complete control and protection unit.

Standardized Design: Complies with international standards and can be seamlessly integrated with other electrical components.

쉬운 유지보수: Modular structure allows easy component replacement and reduces maintenance costs.

1. 적용범위
2. 모터 제어: Suitable for frequent starting, 멎는, forward and reverse rotation control of three-phase AC motors with power below 30kW (380다섯).
3. 산업용 장비: General machinery such as fans, 물 펌프, 압축기, conveyors and machine tools.
4. Building Electrical Engineering: 중앙 에어컨 시스템, fire pumps and elevator control systems.
5. 기타 애플리케이션: Long-distance controlled power transmission and distribution systems, and electrical circuits requiring overload protection.
6. 선택 권장 사항
7. Basic Selection Principles

Contactor Selection: The rated current of main contacts shall be ≥ 1.2-1.5 times the rated current of the motor (유도 부하).

Thermal Relay Selection: The adjustable current range shall cover the rated current of the motor (usually set to 0.95-1.05 times the rated current of the motor).

코일 전압: Selected according to the power supply of the control circuit, 220V or 380V AC are commonly used.

2. Motor Power Matching Table (380다섯)

3. 설치 및 사용상의 주의사항

Mounting Direction: The contactor and thermal overload relay can be installed horizontally or vertically, with an inclination angle not exceeding 5°.

배선사양: The terminals of the main circuit shall be tightened to avoid heating; the cross-sectional area of the control circuit wire shall be ≥ 1.5mm².

환경 요구 사항: 습기가 많은 곳에는 설치를 피하세요, 먼지가 많거나 부식성 가스 환경; 고도 ≤ 2000m.

보호 조정: Must be used with circuit breakers to provide short-circuit protection.

1. 문제 해결

Ⅶ. Substitution and Compatibility

Ⅷ. 요약

Chint CJX2-6511 + NR2-93 is a cost-effective and highly reliable motor control and protection solution, especially suitable for frequent starting and protection applications of small and medium-sized motors. 모듈식 디자인, standardized interface and comprehensive protection functions make it an ideal choice in the field of industrial automation. 선택 중, it is necessary to choose the appropriate adjustable current specification of the thermal overload relay and the coil voltage of the contactor according to the motor power, rated current and control requirements.

Service Life Details of Chint CJX2-6511 + NR2-93

The service life of the Chint CJX2-6511 + NR2-93 combination shall be comprehensively evaluated from three dimensions: 기계적 수명 (no-load operation times), 전기적 수명 (on-load operation times) and actual service life, which is also affected by various factors such as operating conditions and maintenance level.

1. Officially Nominal Life Parameters
2. CJX2-6511 AC Contactor

2. NR2-93 Thermal Overload Relay

1. Key Factors Affecting Service Life
2. Factors Affecting Contactor Life

2. 요인	Influence Mechanism	Influence Degree
   작동 주파수	Frequent operation accelerates mechanical wear and contact ablation	높은 (if the frequency is doubled, the life may be halved)
   부하 유형	The life of AC-4 load (frequent starting/reversing) ~이다 60-80% lower than that of AC-3 load	높은
   Voltage Fluctuation	Overvoltage causes coil overheating, and undervoltage causes contact bouncing	Medium-High
   환경 조건	온도 > 40℃, 습기, dust and corrosive gas accelerate aging	중간
   장착 방법	Non-vertical installation (inclination > 5°) affects heat dissipation and mechanical action	낮은
   Maintenance Level	Regular cleaning and terminal tightening can extend the service life	중간

   Factors Affecting Thermal Overload Relay Life

III. Life Estimation in Practical Application

1. Calculation of Actual Contactor Life (예)

Assumed working conditions: AC-3 활용 카테고리, 100 operations per day, 300 working days per year

Theoretical electrical life: 600,000 운영

Annual operation times: 100 operations/day × 300 days = 30,000 operations/year

Expected service life: 600,000 ¶ 30,000 = 20 연령 (ideal working conditions)

If it is AC-4 utilization category with 200 operations per day:

Theoretical electrical life: 100,000 운영

Annual operation times: 200 × 300 = 60,000 operations/year

Expected service life: 100,000 ¶ 60,000 = about 1.7 연령 (severe working conditions)

2. Estimation of Actual Thermal Overload Relay Life

Control Contact Life: With 50 operations per day, the theoretical 100,000 operations can last for about 5.5 연령.

Heating Element Life: Under normal use (less than 5 overload trips per month), it can work stably for 8-10 연령.

Overall Life: Usually determined by the life of the contactor; the thermal overload relay can be replaced as a wearing part.

1. Practical Suggestions for Extending Service Life
2. Selection Optimization

The rated current of the contactor shall be ≥ 1.2-1.5 times the rated current of the motor.

For frequent starting/reversing conditions, select AC-4 dedicated contactors or use them with derating.

2. Installation and Usage Specifications

Install vertically with good ventilation; control the ambient temperature within -5℃ ~ +40℃.

Keep the control coil voltage stable within ±10% of the rated value.

Set the adjustable current of the thermal overload relay to 0.95-1.05 times the rated current of the motor.

3. 유지 관리 조치

Regularly clean the contacts and iron core to remove dust and oil stains.

Check the wiring terminals to prevent loosening and heating.

After 3-5 years of operation of the contactor, the contacts and coil can be replaced.

When the thermal overload relay trips frequently, check the motor load and main circuit.

1. 요약

Under standard working conditions (AC-3, 100 operations per day), the electrical life of the contactor in the Chint CJX2-6511 + NR2-93 combination is about 20 연령, and the mechanical life far exceeds the actual service demand; the overall life of the thermal overload relay is about 10 연령. The actual service life mainly depends on the operating frequency, load type and maintenance level, and may be shortened to 1-2 years under severe working conditions. Through reasonable selection, standardized use and regular maintenance, the service life of the equipment can be effectively extended and the replacement cost can be reduced.