WAGO series molded case circuit breaker (MCCB)

Opening failure: 1. Operating mechanism failure (such as spring failure or jamming); 2. The release device is damaged; 3. Loose wiring causes the mechanism to fail to interlock. 1. Disassemble and inspect the mechanism, replace the faulty spring, or clean any stuck foreign objects; 2. Replace the release device; 3. Tighten the wiring to ensure normal linkage of the mechanism

Terminal heating: 1. Loose wiring; 2. The cross-sectional area of the wire is too small; 3. Terminal oxidation or poor contact: 1. Re tighten the terminal according to the specified torque; 2. Replace the wires that meet the requirements; 3. Clean the terminal oxide layer and replace the terminal if necessary

Abnormal noise of circuit breaker: 1. Loose installation leads to vibration; 2. Wear or looseness of institutional components; 3. Electromagnetic noise during overload operation: 1. Re tighten the circuit breaker to enhance installation stability; 2. Check the components of the mechanism, replace worn parts, and tighten loose parts; 3. Investigate the cause of overload and reduce the load to the rated range

2. Fault handling principles

Before the fault is thoroughly investigated, it is forbidden to forcefully close the switch to avoid expanding the scope of the fault or causing safety accidents.

If the circuit breaker experiences serious malfunctions such as damage to the arc extinguishing chamber, deformation of the outer shell, or burning of internal parts, maintenance is prohibited and the circuit breaker of the same model must be replaced directly.

After troubleshooting, action testing and electrical performance testing are required to confirm that there are no issues before resuming operation.

Technical parameters and compliance statement

1. Core technical parameters

Rated parameters: Clearly define key parameters such as the rated voltage (e.g. AC 400V/690V), rated current (e.g. 100A~630A), rated breaking capacity (e.g. Icu=50kA), and rated short-time withstand current (Icw) of the circuit breaker.

Release parameters: overload release setting current range, short-circuit release setting current level, ground fault release action current and delay range.

Mechanical parameters: number of operations (mechanical life, electrical life), closing time, opening time, etc.

2. Compliance and Usage Restrictions

Compliance standards: The product complies with international and domestic industry standards such as IEC 60947-2 and GB 14048.2, and has passed relevant certifications (such as CE certification).

Usage restrictions: Clearly state that the product is not suitable for special environments (such as strong corrosion, strong radiation, explosion-proof scenarios). If it needs to be used in special scenarios, a dedicated model must be selected.

Warranty Statement: The product warranty period shall be executed in accordance with the manufacturer's regulations, and the warranty scope does not include damage caused by improper operation or maintenance.