CHINT · Residual-current circuit breaker with overcurrent protection
Product overview
The CHINT NB1L-40 add-on construction combines residual-current, overload and short-circuit protection. Match the complete pole, current, trip-curve, leakage-type and sensitivity code rather than using the ratings of another NB1L construction.
Technical selection summary
| Exact construction | NB1L-40 add-on type; distinct from integrated NB1L, NB1L-63 and slim NB1L-20 |
|---|---|
| Rated current entries | 1, 2, 3, 4, 6, 8, 10, 13, 16, 20, 25, 32 or 40 A in the NB1L-40 technical table |
| Poles / supply | 1P+N, 2P, 3P, 3P+N or 4P; manufacturer voltage reference 230/400 to 240/415 V, 50/60 Hz |
| Detection / sensitivity | Type AC or Type A; 30, 100 or 300 mA according to the exact order row |
| Overcurrent characteristic | B or C curve; select conductor/load coordination and exact 6 / 10 kA version |
| Connection / standard | IEC/EN 61009-1 reference. Combined construction permits top or bottom connection; MCB plus add-on block requires the documented top connection |
The manufacturer overview, technical table and individual order rows cover different constructions and fault ratings. Confirm the exact NB1L-40 or -40H marking, pole/neutral layout, current, sensitivity and fault rating. Do not substitute the integrated NB1L or 50/63 A construction, or infer Type B residual-current detection from a B overcurrent curve.
Typical applications
- Final circuits requiring combined overcurrent and residual-current protection
- Residential, commercial and industrial distribution boards
Product reference images and drawings
Match the exact model, suffix, electrical duty and mounting arrangement. The retained family references may show other versions; use the applicable manufacturer row and drawing for the ordered unit.
