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VM51L, MCCBs with earth leakage protection

The Residual Current circuit breakers of series VM51L (circuit breaker) is one of the new circuit breakers developed with international advanced design and manufacturing technology of our company. The rated insulating voltage is 800 V, Suitable for the circuit with the frequency 50/60 Hz,rated working voltage 400 V, rated current up to 630 V for the infrequent change-over and motor protection. The circuit breakers has the protective function of overload protection,short-circuit protection and under-voltage protection, protect the circuit and the power unit from the damage, at the same time, it can provide the protection against indirect contact,and can also protect against long-term ground faults that cannot be detected by overcurrent protection, which may cause fire hazards. When others protective devices fail, the circuit breaker VM51L with rated residual currents 30 mA can provide additional protect against direct contacts.
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Product profile

  • The circuit breaker can be equipped with a leakage alarm module to avoid major losses caused by power outages.

  • The circuit breakers has two types: type L (Standard and type M(high breaking capacity) according to its rated breaking capacity(lcu), it has characteristics of compact size, high breaking capacity, short arc, anti-vibration, etc.

  • The circuit breaker can be installed vertically or horizontally. The circuit breaker can't be reversed into the line, that is, only 1,3, and 5 are connected to the power line, and 2,4,and 6 are connected to the load line.

  • This circuit breakers has the insulation function.

  • The Circuit breakers meet the requirements of IEC 60947-2.


Conditions for normal use and the installation conditions

  • Ambient temperature -5 ℃~+40 ℃

  • Altitude: Max. 2,000

  • Humidity: When the ambient air temperature is +40 ℃, the relative humidity of the air shall not be higher than 50 %, a higherrelative humidity is allowed at a lower temperature. For example, the relative humidity should be 90% when temperature is 20 ℃. Special measures should be adopted for the condensation occasionally produced due to temperature change.

  • Pollution degree: 3

  • Installation type: Main circut III; Others II.

  • Circuit breaker is suitable for electromagnetic environment A

  • The circuit breaker should be installed in a place where there is no danger of explosion and no lead dust, no enough corrosion metal and damage to insulation.

  • The circuit breaker should be installed in a place where there is no wind and rain

  • Storage temperature: -40 ℃~+70 ℃.


Main technical specifications

V 27.3 3系列 20210302_51-2




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