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Chint CJ20-100 is an contactor AC suitable for the field of industrial control. Este folosit în principal pentru conectarea și deconectarea de la distanță a circuitelor, and can be used in conjunction with a thermal overload relay to achieve overload protection for motors. The following are its detailed technical parameters and application instructions:
1. Parametrii tehnici de bază
– Rated Operating Current: 100O, suitable for controlling three-phase motors with a maximum power of 50kW (AC-3, 380V).
– Voltage Range:
– Rated Insulation Voltage of Main Circuit: 660V, applicable to AC 50Hz/60Hz circuits.
– Optional Control Coil Voltage: AC 110V, 127V, 220V, 380V (50Hz), which should be selected according to actual control requirements.
– Contact System:
– Main Contacts: 3 sets of normally open (3NU), adopting a double-break direct-acting structure, equipped with a clay longitudinal slot arc-extinguishing cover, featuring high breaking capacity.
– Contacte auxiliare: 2 sets of normally open (2NU) + 2 sets of normally closed (2NC) by default, which can be expanded to 4 sets through an expansion module (de ex., F4 series).
– Service Life Indicators:
– Viața mecanică: 10 milioane de operațiuni; Viața electrică: 1.2 milioane de operațiuni (AC-3, 380V).
– Operating Frequency: Până la 600 operations per hour under AC-3 category.
2. Instalare și cablare
– Metode de instalare:
– Screw Fixing: Suitable for fixing on control cabinets or mounting plates. It is necessary to ensure that the inclination angle between the mounting surface and the vertical plane does not exceed ±5°.
– Rail Mounting: Some documents do not clearly state that rail mounting is supported, but the CJ20-10~25A models support 35mm DIN rail mounting. It is inferred that the CJ20-100 may need to be used with an adapter.
– Specificații de cablare:
– Main Contact Wiring: It is recommended to use wires with a cross-sectional area not exceeding 50mm², adopting the front-panel wiring method.
– Coil Wiring: Wires should be selected according to the coil voltage, and attention should be paid to polarity (AC coils have no polarity).
3. Matching and Protection
– Thermal Overload Relay:
– Recommended Model: JR20-160 (5W range, rated current range: 85~100~115A), which is directly connected to the contactor through a conductive plate to achieve overload and phase-failure protection.
– Protection Characteristics: When the current exceeds the rated range, the thermal relay acts within a certain period of time to cut off the control circuit.
– Fuse: It is recommended to match with RT16-250 type fuses (breaking capacity: 50cel) for short-circuit protection.
4. Scenarii de aplicare
– Controlul motorului: Suitable for AC-3 category loads (de ex., frequent starting and stopping of squirrel-cage motors), and can control motors below 50kW.
– Automatizare industrială: Widely used in the electrical control systems of equipment such as machine tools, pumps, and fans, supporting remote operation and interlock control.
– Medii speciale: Interval de temperatură de funcționare: -5℃~+40℃, altitude not exceeding 2000m, pollution degree Class 3, which can adapt to general industrial environments.
5. Alternative Models and Upgrade Solutions
– Chint NXC Series: De exemplu, NXC-115, which has a smaller size, lower power consumption (coil pull-in power: 550VA → 450VA), supports rail mounting, and its electrical life is increased to 2 milioane de operațiuni.
– Schneider LC1-F Series: De exemplu, LC1-F115, which is compatible with the installation dimensions of CJ20-100, has an electrical life of up to 1.5 milioane de operațiuni, and is suitable for high-end applications.
6. Precauții
– Model Selection Verification: The model should be strictly matched according to the actual load type (AC-3/AC-4), Voltaj, and current to avoid overload operation.
– Instalare și întreținere:
– Regularly check the wear condition of the contacts; when the contact thickness is worn by more than 1/3, it should be replaced.
– Ensure that the arc-extinguishing cover has no cracks or dust accumulation to avoid affecting the breaking performance.
– Preț de referință:
– The market price of a single CJ20-100 (AC220V coil) is approximately 150~200 RMB, and the JR20-160 thermal overload relay is approximately 100 RMB.
7. Standards and Certifications
– It complies with GB/T 14048.4 și IEC 60947-4-1 standardele, and has passed the CCC certification, ensuring safety and reliability.
（Note: GB/T refers to “National Standard of the People’s Republic of China”; CCC is the “China Compulsory Certification” mark, a mandatory safety certification system for products sold in the Chinese market.）
