Related Manuals for CHINT NM8L Series
Summary of Contents for CHINT NM8L Series
- Page 1 Series NM8L Circuit-Breakers Incorporating Residual Current Protection Operating Manual 0ZTD.463.416 IEC 60947-2 Standard Compliant Zhejiang Chint Electrics Co., Ltd. March 2010...
- Page 2 Series NM8L Circuit-Breakers Incorporating Residual Current Protection Operating Manual Warning: 1. Wiring operations on this product must be conducted by professionals and the protection cover and flash barrier, if available on this product, must be installed beforehand. 2. Never operate this product with wet hands; otherwise, electric shock may occur. 3.
- Page 3 5. Pre-operation check: 1) Check whether the jump-lead is correct, and make sure that the input terminal of this product is connected to the power cord and the output terminal is connected to the load line. 2) Make sure that neither short circuit nor line-to-ground short circuit exists among all wire connecting terminals or exposed charged parts.
- Page 4 1. Scope This product applies to circuits with an alternating current of 50Hz/60Hz, rated voltage up to 400V and rated current up to 500A. Its main function is to provide indirect contact protection against dangerous personal electric shock and prevent fires resulting from earthing malfunction.
- Page 5 3. Main specifications and technical parameters 3.1 Type and definition 3.2 Classification 3.2.1 By purpose: power distribution protection and motor protection 3.2.2 By the number of poles: three poles and four poles (4A, 4B, 4C and 4D) 4A indicates that no overcurrent releases should be installed on Pole N which is always on;...
- Page 6 3.3 Main technical parameters 3.3.1 For operating characteristics rating, see Table 1 Table 1 Operating characteristics rating Rated residual operating current Breaking time of residual current Type IΔn (A) t (s) NM8L-125S X1: 0.05-0.1-0.2-0.5 t1: 0.1-0.3-0.5-1 NM8L-250S X2: 0.1-0.3-0.5-1 t2: 0.2-0.5-1-2 NM8L-400S X3: 0.3-0.5-1-2 t3: 0.2-1-2-3...
- Page 7 3.4.2 For operating characteristics of circuit breaker releases with residual current protection for motor protection, see Table 6 Table 6 Operating characteristics of circuit breaker releases with residual current protection for motor protection Serial number Testing current I/In Conventional time Initial status Conventional ＞2h...
- Page 8 Figure 2 NM8L-125S (25A, 32A) tripping curve Figure 3 NM8L-125S (40A, 50A) tripping curve...
- Page 9 Figure 4 NM8L-125S (63A, 80A, 100A) tripping curve Figure 5 NM8L-125S (125A) tripping curve...
- Page 10 Figure 6 NM8L-250S (100A, 125A) tripping curve Figure 7 NM8L-250S (160A, 180A) tripping curve...
- Page 11 Figure 8 NM8L-250S (200A, 225A, 250A) tripping curve Figure 9 NM8L-400S, 630S (250A~500A) tripping curve...
- Page 12 Figure 10 NM8L-125S, 250S, 400S, 630S (16A~500A) tripping curve for motor protection 3.5.3 When the ambient temperature is over 40℃, the tripping characteristics will slightly change, do correct them. Table 7 Temperature correction coefficients of thermomagnetic releases Ambient temperature ℃ Temperature correction 0.975 0.95...
- Page 13 NM8-UV230-630 220/230 NM8L-250S,400S, NM8-UV400-630 380/400 630S Auxiliary AC-12/6 NM8L-125S, 250S, 380/400 contact AC-15/2 400S, 630S Warning AC-12/6 NM8L-125S, 250S, 380/400 contact AC-15/2 400S, 630S 3.6 Accessories Accessories of this product include the shunt tripping device, undervoltage tripping device, auxiliary contact and warning contact, which all come in the form of individual module. The accessories can be easily installed in corresponding places of the leakage circuit breaker and can work reliably.
- Page 14 three poles four poles short terminal shield long terminal shield interphase insulating barrier Figure 11 Overall and installation dimensions 6. Ordering instructions When placing an order for the circuit-breakers incorporating residual current protection, the user mush specify the following items: name and type, rated current, rated residual operating current, breaking time, protection type, number of poles and quantity as well as type and rating of internal and external accessories.
- Page 15 Quick Selection Chart for Series NM8L Circuit-Breakers Incorporating Residual Current Protection Code of breaking Number of poles Purpose capability 3 indicates 3 poles M:Motor 4 indicates 4 poles protection Standard indicates that no overcurrent releases should be No code: power installed on Pole N which is always on;...
- Page 16 Quick Selection Chart for Accessories of Series NM8L Circuit-Breakers Incorporating Residual Current Protection NM8L—250S / BM23 / RH22 Accessory Accessory (control Accessory (internal) (connection) mechanism) FM13, FM14: RH11, RH14: economical Shunt tripping Undervoltage Auxiliary Warning panel-front connecting extended rotary handle device release contact...
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