Overview
The HUM8D series molded case circuit breaker (hereinafter referred to as the circuit breaker) is applied in the network circuit of AC 50Hz, rated voltage to 690V, rated current to 1250A power system, used to distribute electric energy and power system protection against overload, short circuit, undervoltage fault, also can be used to control the infrequent operation of electric machines.
The intelligent over-current release of the circuit breaker is controlled by a microprocessor and has three-stage protection characteristics, namely, overload inverse time-delay protection, short-circuit delay protection and short-circuit instantaneous protection. Due to the feature of adjustable artificial short-circuit short-time delay protection, the use category of this circuit breaker is class B, so this series of circuit breakers can realize selective protection with another short-circuit protection device connected in series at the load side.
The three-stage overcurrent protection characteristics of the circuit breaker can be easily set, which can meet the requirements of different loads for protection characteristics and achieve the best match.
The circuit breaker has operating current indication, overload pre alarm indication, release power supply and self-diagnosis indication.
The circuit breaker with H-type intelligent release is also equipped with RS485 serial interface, which can set protection characteristic parameters through the programmer and meet the requirements of communication networking. Therefore, the circuit breaker is an essential component in the intelligent power distribution system with computer as the core.
These products comply with GB/T14048.1, IEC60947-1 , GB/T14048.2 and IEC60947-2.
Normal working conditions
1. The maximum ambient temperature should be -5℃≤T≤+40℃, average temperature should be ≤35℃ at 24h.
2. The relative humidity should not exceed 95%
3. The altitude of installation place should not exceed 2000m. Higher than 2000m need to drop capacity for usage.
4. Pollution grade: 3. There is no explosion in the surrounding air, and there is no corrosion of metals and destruction of insulating gases and conductive dust.
5. Installation type: III
6. “1，3，5，N1” terminals are for power supply, “2，4，6，N2” terminals are for load, cannot be reserved.
7. The installation surface of the breaker shall be perpendicular to the horizontal plane. The basic installation mode of the circuit breaker is vertical installation, the power source is on the top, the load end is below, and it can be installed horizontally.
