Ac contactor is widely used. Here are some notes for selecting ac contactor:
1. For the equipment in continuous operation, the rated working current of the contactor shall be calculated at 67%~75%, that is, the ac contactor of 100 amperes, which can only control the equipment below the maximum rated current of 67~75 amperes.
2. For equipment with intermittent operation, the rated working current of the contactor is calculated at 80%, that is, the ac contactor with 100 amperes, which can only control the equipment with the maximum rated current below 80 amperes.
3. For the equipment with repeated short-time working, the rated working current of the contactor shall be calculated at 116%~120%, that is, the ac contactor with 100 amps, which can only control the equipment with the maximum rated current below 116~120 amps.In addition, also need to consider the working environment and contactor structure form to choose, this electrician friends have to understand.
Description: sometimes in order to reduce the cost, it is possible to reduce the wire diameter or even the number of turns in the production of the coil. The material used in the contact does not meet the national standard, or the thickness and section of the material used do not meet the requirements.
This phenomenon occurs not only in contactors, but also in other products such as circuit breakers!Therefore, in practical use, a contactor or circuit breaker whose nameplate is 100 amps can only carry 80 amps or less!