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The NXM Series Moulded-Case Circuit-Breaker is a device designed for electrical protection and control in various applications. This user manual provides essential information regarding its installation, operation, and maintenance, adhering to the Standard: IEC/EN 60947-2.
Before any installation or operation, it is crucial to observe several safety warnings to prevent accidents and ensure proper functioning. The device should not be installed in damp, condensed-phase environments or where flammable and explosive gases are present. Operation with wet hands is strictly prohibited. Touching conductive parts of the product while it is operating is forbidden. When the product is being installed or maintained, the power must be switched off. The product must not be installed in places where gas medium can corrode metal and damage insulation. To avoid dangerous accidents, the installation and fixation of the product must be carried out in strict accordance with the requirements of the user instructions.
The NXM Series circuit breaker is designed for an ambient temperature range of -5 °C to +40 °C. For temperatures outside the range of -35 °C to +70 °C, consultation with the manufacturer is required. If the altitude exceeds 2000m, the manufacturer should be consulted. The product sample for inverse time lag, temperature compensation curve, and altitude derating curve of the product should be consulted. The pollution degree is degree 3, and the main circuit installation category is III. The degrees of protection provided by the enclosure are IP30 (except wiring terminals). The rated insulation voltage Ui is 800V (NXM-63/160/125/250) and 1000V (NXM-400/630/800/1000/1250/1600).
Before installation, a thorough inspection and test are recommended. The manual provides a table detailing the screw, nut, flat gasket, spring washer, and PCS (2P, 3P, 4P) specifications for various NXM models, including NXM-63, NXM-125, NXM-160, NXM-250, NXM-400, NXM-630, NXM-800, NXM-1000, NXM-1250, and NXM-1600. This ensures that all components are correct and in good condition. During this stage, it is important to determine product technical parameters and ensure that only qualified and professional technicians are allowed for installation, operation, and maintenance.
The manual also includes figures illustrating the minimum installation distance for various NXM models, ensuring adequate space for operation and heat dissipation. Furthermore, it details a 5-step test process: Retripping, Making (x2), Breaking, and Tripping, which are crucial for verifying the circuit breaker's functionality before full deployment.
Detailed diagrams and tables provide the overall and installation dimensions for different NXM series models.
NXM-63~250 Front-Panel Wiring: For NXM-63~250 models, the dimensions for 2P, 3P, and 4P configurations are provided, including W3, W4, M, L, B, C, E, F, G, H, J, W, W1, Hmax, H1, H2, H3, H4, L1, and A. These dimensions are critical for precise mounting and wiring.
NXM-400~1600 Front-Panel Wiring: Similarly, for NXM-400~1600 models, the dimensions for 3P and 4P configurations are detailed, including W1, W2, W3, W4, W5, M, L, B, C, E, F, G, H, J, Hmax, H1, H2, H3, H4, L1, A, B, and φd. These larger models require specific clearances and mounting considerations.
Rear Wiring: The manual also illustrates rear wiring configurations. For NXM-63~250, Figure 6 shows the rear wiring overall and installation dimension, including M2, W, P1, P2, P3. For NXM-400~800, Figure 7 shows the rear wiring overall and installation dimension, including φd1, W, P1, P2, P3, P4. Figure 8 details the NXM-1000 rear wiring overall and installation dimension, including φd1, W, P1, P2, P3. Figure 9 illustrates NXM series rear wiring mounting plate hole dimension for 3P and 4P configurations, including W, B2, L6, 4×φd2, 6×φd2.
Plug-in Wiring: For plug-in configurations, Figure 10 shows the NXM series plug-in wiring overall and installation dimension, including P10, P9, L7, L8, O, M1, L6, 4×φd2, K, L5. Figure 11 details the NXM-63/125/400/630/800/1000 plug-in structure, including P5, P6. Figure 12 shows the NXM-160 plug-in structure, including P6, P7, P8. Figure 13 details the NXM-250 plug-in structure, including P5, P6, P7, P8.
Back-Panel Wiring: Table 3 provides specifications for NXM series back-panel wiring overall and installation dimensions for models NXM-63/NXM-125, NXM-160, NXM-250, NXM-400/NXM-630, NXM-800, and NXM-1000. Key dimensions include W, P1-P10, φd1, φd2, φdD, L2, B, L4, L5, L6, L7, L8, K, Q, A, and φd3.
The manual provides detailed figures for connecting plates and wiring dimensions for various NXM models.
NXM-63/NXM-125: Figure 14 illustrates the connecting plate and wiring dimension, including c≤4, M6×12, 4N·m, a≤8, b≤17.5, φ6.5, and cross-sectional area 's'. NXM-160: Figure 15 shows the connecting plate and wiring dimension, including c≤5, M8×16, 10N·m, a≤7.5, b≤16, φ8.5, and cross-sectional area 's'. NXM-250: Figure 16 details the connecting plate and wiring dimension, including c≤8, M8×16, 12N·m, a≤10, b≤23.5, φ8.5, and cross-sectional area 's'. NXM-400: Figure 17 illustrates the connecting plate and wiring dimension, including c≤13.5, M10×30, 30N·m, a≤11.5, b≤30.5, φ10.5, and cross-sectional area 's'. NXM-630: Figure 18 shows the connecting plate and wiring dimension, including c≤13.5, M10×30, 30N·m, a≤11.5, b≤30.5, φ10.5, and cross-sectional area 's'. NXM-800: Figure 19 details the connecting plate and wiring dimension, including c≤12, M12×35, 40N·m, a≤15, b≤41, φ14, and cross-sectional area 's'. NXM-1000: Figure 20 illustrates the connecting plate and wiring dimension, including c≤20, M12×35, 40N·m, a≤15, b≤43, φ14, and cross-sectional area 's'. NXM-1250/NXM-1600: Figure 21 shows the connecting plate and wiring dimension, including M10×45 (1000), M10×55 (1600), 30N·m, and rated current (1600A, 1250A/1000A) with corresponding h values (20, 15).
Motor Driven Mechanism: Figure 22 illustrates the motor driven mechanism overall and installation dimension, including K, A, T, B1, B2. Figure 23 shows the wiring of the motor driven mechanism (AC), detailing connections for Uc, B1, B2, motor driven, ON, OFF. Table 4 provides NXM series motor driven mechanism overall and installation dimensions for various models, including K, B1, B2, T, A, and B.
Manual Operation Mechanism: Figure 24 illustrates the manual operation mechanism installation dimension, including N, 18, 30.5, 150Min, φ36, 2×φ5.5. Table 5 provides NXM Series manual operation mechanism installation dimensions for various models, including N and L.
Wiring Diagrams: Figure 25 shows the wiring of a special tripper for prepaid electricity meter, including L1, L3, L5, N, Tripper, Ctrl, and Breaker. Figure 26 illustrates the wiring of an auxiliary contact, including F11, OF, F14, F12, Power supply, Loop of switching on, and Loop of switching off. Figure 27 shows the wiring of an alarm contact, including B11, OF, B14, B12, and Power supply. Figure 28 details the wiring of an under voltage tripper, including UC2, UC1, P1, P2, and Power supply. Figure 29 illustrates the wiring of a shunt tripper, including C1 and C2.
Figure 30 illustrates the flash barrier or protective guard, showing how to insert it in the direction of the arrow on the flash barrier. A warning note emphasizes that the flash barrier must be installed before operation. Users should check if the wiring is correct and, after installation, ensure the insulation resistance to the ground is not less than 10MΩ.
To protect the environment, the product or product parts should be disposed of according to industrial waste treatment processes or sent to a recycling station for assortment, dismantling, and recycling.
The product comes with a QC PASS certification, indicating it has passed quality control. It is an NXM Series Moulded-Case Circuit-Breaker conforming to IEC/EN 60947-2. The test date is available on the packaging. The product is manufactured by Zhejiang Chint Electrics Co., Ltd.
Zhejiang Chint Electrics Co., Ltd. is located at No.1, CHINT Road, CHINT Industrial Zone, North Baixiang, Yueqing, Zhejiang 325603, P.R.China. Contact can be made via E-mail: global-sales@chint.com or by visiting their website: http://en.chint.com. The manual also includes symbols for recycling and proper disposal of electronic waste.
General| Brand | CHNT Power |
|---|---|
| Model | NXM Series |
| Category | Circuit breakers |
| Language | English |
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