When selecting AC contactor should be used in the insulation rating of A-level and above products, must ensure that its rated current of the main circuit contacts should be greater than or equal to the load current is controlled by the line. Contactor solenoid rated voltage of 380V or 220 V2. Optional similar LJM (J) series energy-saving type, and is the low sensitivity of delay protection. Way protection device to comply with national GB13955-2005 "residual current operated protective devices to install and run" standard in the rural power grids in demand was due to the large number of distribution boxes, short construction period, distribution box factory needs of the low-voltage electrical The delivery time urgency and quantity, thus creating the product quality is not critical phenomena Shanghai explosion distribution box manufacturers, resulting in a number of products put into operation soon after failure. Some models, such as exchanges and contacts soon, because closing the contactor coil burned out and put into operation in the distribution box, but can not run. 1.3 electrical distribution box failure caused by improper selection due to manufacturing capacity of AC contactor choose not very appropriate for different outlet circuit installed with the capacity of AC contactor, and not taking into account the three-phase load imbalance Jinan explosion distribution box manufacturers, but failed to qualify partial contact current rating in the normal selection model based on the Wenzhou explosion distribution box manufacturers to improve a current level of 2.1 for selection to improve the capacity of distribution transformers in 100kV · A and above The power distribution box, in the box at the side wall thermal windows, you should take into account the installation thermostat relay (JU-3 type or JU-4 ultra-small temperature relay) and axial fans, electrical control panel mounted on the left side surface of the box so that the inside temperature reaches a certain value (eg 40 ℃) can automatically start the exhaust fan, exhaust heat to make the box forced cooling. Jinan distribution box factory explosion-proof distribution box manufacturers _ _ Koretoyo Koretoyo explosion proof provided by Zhejiang Electric Co., Tianjin Office. Zhejiang Koretoyo explosion-proof electrical Ltd. Tianjin Office (#) strong, credible, in Tianjin's proof lighting industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Koretoyo innovative ideas will lead into the brilliant explosion and you work for a better future!