SJKM8-225/3300 Molded Case Circuit Breaker

Product selection is simple
The breaking capacity covers commonly used breaking devices in the secondary distribution field and the electromechanical market, including 25kA, 36kA, and 50kA, as well as 3-pole and 4-pole products The entire series of products only have 3 shell sizes, and fewer standard sizes provide convenience for future expansion and upgrades ● Comprehensive protection range, including low-voltage distribution system protection, motor protection, and leakage protection
Easy product installation
Installation methods include fixed and plug-in
Various accessories can be installed on site
● Switching between upper and lower incoming lines does not require capacity reduction, avoiding the appearance of "spider webs" in the distribution box
The installation position is flexible and diverse, and can be installed vertically, horizontally, sideways or backwards, without affecting the product performance at all ● Provide complete installation and connection accessories to meet different installation needs
Easy to use
The switch status is reliable and accurately indicates the contact position, bringing you "visible safety" The highest protection level can reach IP54
The operation methods include toggle operation, direct rotation handle operation, and extended rotation handle operation ● Provide leakage alarm without tripping function to ensure safety and better guarantee power supply continuity
Application
The SJKM8 series molded case circuit breaker is suitable for distribution networks with AC 50/60Hz, rated working voltage of 500V (440V for 400/630A), and rated current of 15 to 630A. It is used to distribute electrical energy and protect lines, power sources, and electrical equipment from overload and short circuit hazards, improving the reliability and continuity of power supply
Compliant with standards
International standards:
○ IEC 947-1: General Principles (GB/T 14048.1)
○ IEC 947-2: Circuit Breakers (GB/T 14048.2)
○ IEC 947-4: Contactors and Motor Starters (GB/T 14048.4)
○ IEC 947-5.1: Control equipment and switches: Automatic control elements (GB/T 14048.5)
National standard:
○ GB 14048.1 General Provisions
○ GB 14048.2 Circuit Breaker
Anti humidity measures
The SJKM8 circuit breaker and auxiliary device T2 are designed to withstand humid and hot conditions, with the following implementation standards:
IEC 68-2-30 at 45 ℃, 95% relative humidity (hot and humid climate):
IEC 68-2-11 Salt Spray Test
Isolation function
All SJKM8 circuit breakers are suitable for isolation and comply with IEC 947-2 standard:
● Contact isolation position at "0" (OFF position):
Unless the contact is fully open, the operating slot cannot be in the "OFF" position:
The contacts must be in the open state before installing the padlock:
The installation of the extended rotating handle will not change the reliability of the position indication system
Isolation function has guaranteed testing guarantee:
The position indication system ensures the reliability of mechanical contact:
● No leakage current:
Overvoltage tolerance refers to the ability to withstand the voltage value between its incoming and outgoing lines
Installation of Class II switchgear
All SJKM8 circuit breakers should be installed in class Il switchgear (according to IEC 664 standard): installation and commissioning do not require special operations, as SJKM8 provides insulation for class Il panels and all internal circuits
● Incoming line method
When using SJKM8 for both incoming and outgoing lines, there is no need to consider reducing capacity (except for SJKM8L). This feature will provide greater convenience for the installation of cabinets
SJKM8 series circuit breaker low voltage distribution protection Functions and Features