What percentage of rated current should galvanic isolators be tested at until temperature stabilization is achieved?

Galvanic isolators are essential components in marine electrical systems as they prevent unwanted galvanic currents from affecting the integrity of the metal structures of the vessel. When testing these devices, it's critical to apply a current sufficient to ensure that the device is operating under conditions that mimic its real-world use.

Testing at 135% of the rated current is appropriate because it allows for the establishment of a temperature stabilization condition, ensuring that the isolator operates under a stress level that reflects its maximum allowable current capacity. This percentage ensures that the device can handle potential surges above its rated capacity and helps in assessing whether the galvanic isolator will function correctly under peak conditions.

The choice of 135% strikes a balance, providing a rigorous test without being excessively above the rated current, which could lead to heating issues that might not occur in practical applications. This percentage aligns with industry standards and practices that seek to verify the reliability and efficacy of galvanic isolators over prolonged usage.

While other percentages like 125%, 130%, and 140% could theoretically be chosen for testing, 135% remains the established benchmark for achieving reliable results while maintaining safety margins. Testing at these levels ensures that the isolator can manage current loads effectively, thus preserving the integrity