1. Select the main technical parameters of the low-voltage distribution cabinet according to actual needs.
In addition to removing the rated voltage, rated frequency, and rated current parameters, the low-voltage distribution cabinet should also pay attention to the following points: larger rated current value, rated short-term resistance current, peak current, short tolerance functional unit form, indoor space, enclosure protection level, etc. These references to all relevant standards should be strictly selected according to the standards, and values that do not meet the engineering requirements cannot be selected.
2. Clearly require important components of low-voltage distribution cabinets.
Basic requirements, functional modules, simple assembly, small modular cabinet positions, diverse installation methods, large installation dimensions, and providing upper operating temperature limits. Secondly, circuit breakers. High segmentation ability, controllable installation, allowing switching to exits, grounding fault protection function, three protection functions, memory function, display of unbalanced loads, warning function, accident alarm, and high accessories; In addition, interlocking switch, switch cabinet door interlocking device, mechanical interlocking, level before interlocking protection, backup protection interlocking, regioselectivity interlocking, step-by-step interlocking tripping, etc. are also required, but the requirements for the modularization of accessory functions are required.
3. The AC contactor has many functional module requirements and can meet the current requirements and specifications.
Modular installation can be adopted to improve the resistance to overload current and damage; In order to improve high-temperature resistance, contactors should have reliable operating characteristics in high-temperature environments.