Scope of applicationThe NLDM1L series moulded case circuit breaker with residual current protection (hereinafter referred to as residual current circuit breaker) is suitable for infrequent switching and motor starting in AC 50Hz (or 60Hz)circuits with rated insulation voltage of 1000V, rated operating voltage of 400V and rated operating current of 630A (800A). The circuit breaker has overload, short circuit, and undervoltage protection functions, which can protect the circuit and power equipment from damage; meanwhile, it can provide indirect contact protection for people and also provide protection against potential fire hazards caused by long-term grounding faults that cannot be detected by overcurrent protection. When other protective devices fail, the NLDM1L residual current circuit breaker with rated residual operating current of 30mA can directly provide additional protection.

The circuit breakers are classified into L-type and M-type according to their rated ultimate shortcircuit breaking capacity.

The circuit breaker has the characteristics of small volume, high breaking capacity, short arc and high vibration resistance.

The circuit breaker can be installed vertically (i.e. upright) or horizontally (i.e. transversely).

The circuit breaker complies with the standards of IEC60947-2, GB14048.2 and Appendix B for circuitreakers with residual current protection

The circuit breaker doesn't allow reverse wiring, that is, only 1, 3, and 5 are allowed to connect to the power line, and 2, 4, and 6 are allowed to connect to the load line.

Reverse wiring can be customized if needed.

Note:

1. According to rated ultimate short-circuit breaking capacity, it is classified into L type (medium breaking) and M type (high breaking).

2. No code for direct operation of handle; Electric operation is represented by P; The rotation handle is represented by Z.

3. The circuit breaker for power distribution has no code; The protection motor is represented by 2.

4. It is classified into three poles and four poles according to the number of poles. There are four types of neutral pole (N-pole) in the four-pole products: Type A: The N-pole is not equipped with over-current release, and the N-pole is always connected, not closed or opened with other three poles. Type B: N-pole is not equipped with over-current release, and N-pole is closed and opened together with other three poles (N-pole is closed first and then opened).

5. The residual current release mode is classified into Type I and Type II (see Table for details). Type I is the standard type, and Type II should be specified when ordering.

6. If there is no alarm unit module, then there is no code. It should be specified when ordering if the product with alarm unit module.

Note: "-" in the table represents inapplicable, and "■" represents applicable

The derating coefficient of the environmental temperature change of the residual current circuit breaker (all derating coefficients in this table are measured at the rated current of the frame)