Product description：1. Scope of application NM8L or NM8SL residual current operated circuit breaker is made of NM8 or NM8S combined with residual current protection module NM8Land NM8SL series residual current operated circuit breakers mainly apply to the ci
1. Scope of application
NM8L or NM8SL residual current operated circuit breaker is made of NM8 or NM8S combined with residual current protection module, NM8Land NM8SL series residual current operated circuit breakers ,mainly apply to the circuits with alternating current of 50Hz, rated voltage of 400V and rated current up to 630A, It is used to provide protection of persons against indirect contact. Meanwhile, it can also provide additional protection against fire and other hazards which may develop as a result of an earth fault of a lasting nature. Obvious, it can provide protection of installations against overloads, shortcircuit currents and under-voltage. They are in accordance with the standards of IEC 60947-2.
2. Normal service and installation conditions
2.1 The altitude of the site of installation does not exceed 2000 m.
2.2 Foreign field of the installation site for residual current operated circuit breaker should not exceed five times of earth magnetic field in any direction.
2.3 Operating value of Electronic release will not be affected by temperature variation; however, the maximum permissible current of residual current operated circuit breaker is related to ambient temperature.
2.4 Humidity: Relative humidity of atmosphere doesn’t exceed 50% at ambient temperature of +40℃. Higher relative humidity may be permitted at lower temperature, and average maximum relative humidity for the wettest month can reach 90% ,at the same time, the average lowest temperature is +25℃, and condensation produced on the surface of products due to temperature change shall be taken into consideration. 2.5Pollution degree: pollution degree of residual current operated circuit breaker is Grade Ⅲ.
Add: No.658 Jinzhong Rd, Changning District Shanghai, China