Shop for CHINT NB3LEG-40 Residual Current Operated Circuit Breaker

CHINT NB3LEG-40 Residual Current Operated Circuit Breaker,

with Over-current Protection (Electronic) provides combined earth leakage and over-current protection in a compact electronic design.
It safeguards circuits against overloads, short-circuits, and residual current faults,
ensuring both electrical safety and operational reliability. With Type A and AC tripping characteristics,
6 kA short-circuit capacity, and B/C curves for different load types,
it is ideal for residential and commercial distribution systems.
The NB3LEG-40 delivers precise fault detection and quick disconnection to minimize downtime and prevent hazards.

Function: Combined protection against overload, short-circuit, and residual current leakage
Standards Compliance: BS EN / IEC 61009-1
Rated Current (In): 6 A, 10 A, 13 A, 16 A, 20 A, 25 A, 32 A, 40 A
Poles: 1P+N
Rated Voltage (Ue): 240 V AC
Rated Frequency: 50 Hz
Tripping Type: Electronic
Tripping Curves:
- B Curve (3–5 In): For long cable circuits and TN/IT systems
- C Curve (5–10 In): For resistive and inductive loads with low inrush currents
Leakage Detection Types: Type A (AC + pulsating DC) and Type AC (sinusoidal AC only)
Rated Residual Operating Current (IΔn): 10 mA / 30 mA
Rated Residual Making and Breaking Capacity (IΔm): 3,000 A
Rated Short-circuit Capacity (Icn): 6,000 A
Rated Impulse Withstand Voltage (Uimp): 4 kV (1.2/50 μs waveform)
Insulation Voltage (Ui): 500 V
Dielectric Test Voltage: 2 kV for 1 minute
Break Time Under IΔn: ≤ 0.1 s
Rated Pollution Degree: 2
Electrical Life: 4,000 operations
Mechanical Life: 20,000 operations
Contact Position Indicator: Yes
Ambient Operating Temperature: –5 °C to +40 °C (average ≤ 35 °C)
Storage Temperature: –25 °C to +70 °C
Temperature Derating: Reference temperature 30 °C; current derating factor:
- 0.95 at 40 °C
- 0.85 at 60 °C
- 0.80 at 70 °C
Mounting Method: 35 mm DIN rail (EN 60715), quick clip-on
Connection Direction: From bottom