Residual current circuit breaker (RCBO, УЗО) NB1L-40 3P+N 25A 30ma 6KA CHINT

Residual current circuit breaker (RCBO, АВДТ) CHINT NB1L-40 3P+N C25 30mA 6kA The CHINT residual current circuit breaker of the NB1L series is a high-tech combined device that unites the functions of a circuit breaker and a residual current device (RCD). The model in four-pole design (3P+N) is intended for the protection of three-phase four-wire AC networks. The device provides reliable protection of electrical equipment against overloads and short circuits and also guarantees the safety of personnel by preventing electric shock in the event of earth leakage. Technical parameters Manufacturer: CHINT Electric Series: NB1L Rated current (In): 25 A Number of poles: 3P+N (three phases and neutral) Leakage current (residual current): 30 mA Tripping characteristic: C (for mixed and inductive loads) Breaking capacity: 6 kA (6 000 A) Type of residual current release: AC (protection against sinusoidal alternating leakage currents) Rated voltage: 400 V AC Device width: 72 mm (4 modules) Mounting type: On DIN rail (35 mm) Design features The NB1L-40 consists of two units: a circuit breaker of the NB1 series and a residual current protection module. The four-pole construction allows three phases and the neutral conductor to be switched simultaneously, with the neutral pole opening at the same time as the phase poles. The front panel carries a «Т» (Test) button for regular checking of the protection. A built-in contact position indication window shows unambiguously whether the device is switched on, and a special leakage-current trip indicator helps to diagnose quickly the cause of the supply disconnection. Advantages Comprehensive protection: Combining protection against short circuit, overload and current leakage in one housing saves space in the board and simplifies the circuit. High reliability: A breaking capacity of 6 kA ensures safety in networks with high short-circuit currents. Safe maintenance: Complete disconnection of all phases and the neutral guarantees the absence of dangerous voltage on the load side. Convenient diagnostics: Mechanical indication of the fault type reduces equipment downtime during fault finding. Stable operation: An improved arc-quenching system extends the service life of the contacts under fault tripping. Field of application The NB1L 25A 3P+N is widely used for protecting medium-power three-phase loads: electric cookers, instantaneous water heaters, small machine tools and climate control equipment. The device is also used as a group protective device in the distribution boards of residential buildings and offices where reliable protection is required against fire caused by current leakage in cable lines.

Manufacturer	CHINT
Rated current, A	25
Number of poles:	3
Network type	Alternating current
Breaking capacity, kA	6

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