To safely close a circuit breaker, the operating mechanism's springs must be charged. These springs store the energy required to close the main contacts.
🔋 Charging the Springs
There are two methods to charge the springs:
1. Manual Charging
Use the charging handle and pull it down six times until you hear a distinct “clack” sound.
This indicates the springs are fully charged.
2. Motor Charging (Optional)
If equipped, the MCH gear motor automatically charges the springs.
🔍 Charge Status Indicator
The breaker will display one of the following:
- Charged OK – Springs are fully charged and ready.
- Half Charged / Not OK – May indicate phase protection is active or auxiliary circuits are not yet ready.
✅ Conditions Required to Close the Breaker
The circuit breaker can only be closed when it is “ready to close.” This means:
- The breaker is in the OFF position.
- The springs are fully charged.
- There is no active opening command.
If the breaker is not ready when a closing command is issued: ➤ Cancel the command and retry once the breaker shows “ready to close.”
⚙️ Closing the Circuit Breaker
Local Mechanical Closing
➤ Press the mechanical ON pushbutton located on the breaker.
📊 Recommended Visuals
To improve clarity, consider adding:
- Spring Charging Diagram – Manual vs. motor charging.
- Status Indicator Visuals – Showing “Charged OK” and “Not OK.”
- Flowchart – Steps from charging to closing the breaker.
Released for: Schneider Electric Thailand
