슈나이더 열 과부하 계전기 LRN357N

그만큼 슈나이더 thermal overload relay LRN357N is an electrothermal relay specifically designed for motor overload protection, and it is suitable for industrial automation control systems.

1. 핵심 매개변수 및 기능

현재 범위: The rated current range is 3750A, which can be accurately matched with motors whose rated current falls within this interval.

정격전압: It supports 690V AC and is applicable to most industrial threephase circuits.

여행 클래스: The trip class is 10, which means that in case of overload, the relay will trigger a protection action within 10 seconds and quickly cut off the circuit to prevent motor damage.

보호 기능:

과부하 보호: Based on the principle of thermal expansion and bending of bimetallic strips, it monitors the motor current to avoid overheating caused by longterm overload.

위상 오류 보호: It detects the imbalance of threephase currents and prevents the motor from being burned out due to phasefailure operation.

LockedRotor Protection: It trips quickly when the motor is locked during startup or operation.

2. Installation and Connection

설치 방법:

결합 설치: It can be directly plugged into 접촉기 of the LC1N50~N95 series to form a compact motor starter module.

독립적인 설치: It needs to be used with the LAEB1N base (주문 번호) and fixed in the control cabinet with screws, which is suitable for occasions with limited space.

배선 방법: It adopts screwclamped terminals and usually supports a wire crosssectional area range of 2.56mm² to ensure a reliable connection.

3. Reset and Operation

Reset Methods:

수동 재설정: 넘어진 후, the reset button needs to be pressed manually to restore the circuit connection, so as to avoid safety risks caused by automatic restart.

자동 재설정: It can be switched to the automatic mode through a selector switch (use with caution to prevent false startup when the fault is not eliminated).

테스트 기능: It is equipped with a test button, which can simulate overload tripping to verify the working status of the relay.

4. 응용 시나리오

모터 제어: It is widely used for the protection of threephase asynchronous motors such as fans, 물 펌프, 및 압축기, and is especially suitable for equipment with frequent startup/shutdown or large load fluctuations.

산업용 제어 캐비닛: As a core component of motor starters, it ensures the longterm stable operation of the system.

호환성: It is perfectly matched with contactors of the Schneider LC1N series, simplifying the selection and installation process.

5. 가격 및 조달

참고가격: Depending on the procurement channel and quantity, the unit price ranges from 100 에게 200 인민폐. 대량 조달의 경우, you can contact via WhatsApp: 0086138112554325 협상을 위해.

Genuine Verification: Purchase through official Schneider channels or authorized distributors to ensure the product has anticounterfeiting marks and complete packaging, and avoid counterfeit products.

6. 지침

환경 조건: The normal operating temperature range is usually 25℃~+60℃, and exposure to hightemperature, 습한, or corrosive environments should be avoided.

정격전류 설정: 설치 전, adjust the dial according to the rated current on the motor nameplate to ensure that the protection sensitivity matches the actual load.

유지 관리 권장 사항: Regularly check the tightness of terminals and the condition of bimetallic strips, and clean dust to maintain stable performance.

7. Comparative Selection

Comparison with LRN355N:

현재 범위: LRN355N has a range of 3040A and is suitable for lowpower motors; LRN357N covers 3750A and is suitable for medium and highpower equipment.

Contactor Matching: LRN355N is compatible with LC1N40~N95 contactors, while LRN357N is compatible with LC1N50~N95 contactors. The selection should be based on the contactor model.

8. 인증 및 표준

국제 인증: It complies with the standards of IEC 6094741 (Lowvoltage switchgear and controlgear) 그리고 UL 508 (Industrial control equipment), ensuring global universality and safety.

요약

With its reliable protection performance, flexible installation methods, 폭넓은 호환성, the Schneider LRN357N thermal overload relay has become an ideal choice for industrial motor control. 선택 및 사용 중, comprehensive consideration should be given to motor parameters, 설치 공간, and system requirements to ensure the safe and efficient operation of the equipment.