Product Overview

The UEM5 series molded case circuit breakers (hereinafter referred to as: the circuit breakers) are suitable for use  in AC 50Hz / 60Hz circuit, having rated current from 16A to 800A, rated insulation voltage of 800V and rated operational voltage of 690V and below. They have the functions of overload, short circuit and undervoltage protection.  The UEM5L series also has residual current protection function to protect people from electric shock and to  prevent fire caused by insulation damage. Under normal circumstances, the circuit breakers can be used for  infrequent switching of circuits and infrequent starting of motors. The circuit breakers can be equipped with undervoltage release, shunt release, auxiliary contact, alarm contact,  motorized operating mechanism, manual operating mechanism and other accessories. They are suitable for  isolation. The corresponding symbol is ”.

Product Features

- The base and cover, which is made of USA IDI company’s thermosetting material, have high strength and   insulation quality, in order to ensure the breaker’s performance reliability. 

- Advanced design of operation mechanism results in rapid breaking and slight tripping force. Introduction of   “Double-way breaking system” not only led to reduction in size and cost of the circuit breaker but also greatly improved the short breaking capacity and achieved high withstand voltage performance, thus combining   cost-effectiveness and practicality. 

- The contact system adopts the principle of electromagnetic repulsion. Once there is a fault current, the electric   repulsion force will make the moving and fixed contacts rapidly break, lock the moving contacts and increase   the open distance to avoid the arc reburning using the Hongfa unique patent technology, so as to achieve   current limiting and improve the breaking capacity.

- The circuit breakers of the same frame size but with different breaking capacity such as M and H type, share   absolutely identical overall and installation dimensions, which can extremely improve the interchangeability.

- The design of cassette-type accessories (including shunt release, under-voltage release, auxiliary and alarm   contact) ensures the flexibility of control function. The user can install them without opening the cover, and no   adjustment is needed. The high safety operation has been achieved thanks to insulation box design principle. 

- The UEM5L series MCCB with residual current protection has reliable low-voltage protection, which ensures   that residual current protection works normally even with the line voltage low to 50V. The residual current sens itivity of the products is adjustable, and the operating time with time delay or not is adjustable. - The rated insulation voltage for the whole series is up to 800V, and rated impulse withstand voltage is up to   8000V, which realize high reliability and safety. 

- The advanced alloy material for moving contacts has been used to ensure high mechanical and electrical   endurance.