Eaton Circuit Breaker - mRB6 - 16A - 4 Pole - 300mA - Type C

An earth leakage circuit breaker (ELCB) or Residual Current Device (RCD) detects imbalances in current between the live and neutral conductors, indicating a fault to earth. Standard circuit breakers primarily protect against overcurrents and short circuits.

The 300mA (milliampere) rating indicates the minimum earth leakage current that will cause the breaker to trip. This level is generally used for main incomer protection to prevent serious fires or major damage, rather than personal protection (which typically uses lower mA ratings).

Type C breakers are designed to tolerate higher inrush currents, typically 5 to 10 times the rated current, for a short duration. This makes them suitable for circuits powering inductive loads like motors and transformers, reducing nuisance tripping.

While it provides essential safety, the 300mA sensitivity is generally not sufficient for direct personal protection against electric shock, which typically requires RCDs with sensitivities of 30mA or lower. This breaker is better suited for circuit and equipment protection.

A 4-pole breaker is typically required for three-phase (3p) circuits where a neutral conductor (n) is also present and needs to be switched or protected simultaneously. This is common for machinery and equipment with three-phase motors.

This suggests that the breaker might be more susceptible to damage from severe electrical surges or physical impacts compared to models with higher impact resistance ratings. It is important to ensure proper installation and protection of the electrical panel.

This indicates a significant ground fault or short circuit. Disconnect all loads and test individual circuits or components. Ensure correct wiring and that no DC fault currents are exceeding the breaker's sensitivity.

The breaker may be faulty or the fault current is below the tripping threshold. Test the breaker's functionality with a dedicated RCD tester. If it fails, replace the unit. Ensure the simulated fault is within the breaker's rated sensitivity.

Check that all connections are securely tightened. Ensure the conductors are correctly sized for the 16A rating. Loose connections are a common cause of overheating.