Which type of overload device is strictly current sensitive?

The magnetic overload device is designed to protect electrical circuits by being strictly sensitive to current levels. Unlike other types of overload devices that may rely on temperature changes, magnetic overloads utilize electromagnetic principles to detect excessive current flow. When the current flowing through the device exceeds a predetermined threshold, the magnetic field generated activates a mechanism that trips the circuit, preventing damage to the equipment.

In contrast, thermal overload devices operate based on temperature, responding to the heat generated by excessive current flow rather than the current itself. Electronic overloads may utilize a combination of current and other parameters to function, while mechanical overload devices often rely on physical movement triggered by different conditions. Therefore, among the options provided, the magnetic overload device is distinct in its exclusive reliance on current sensitivity for its operation.