What is the maximum voltage rating for a D type plug fuse?

The maximum voltage rating for a D type plug fuse is indeed 150V. This rating is critical because it designates the highest voltage at which the fuse can operate safely. In practice, a D type fuse is typically used in certain applications where a lower voltage is common, making it suitable for devices operating at this level.

Fuses are designed to protect electrical circuits by melting when the current exceeds a specific threshold, thus interrupting the flow of electricity and preventing damage or fire hazards. Ratings associated with fuses—such as voltage and current—are vital for ensuring that the correct fuse is installed for the specific application. Using a fuse rated for a higher voltage than needed can present safety risks, as it may not blow when needed under fault conditions.

In contrast, fuses at the other voltage ratings specified would not be suitable for a D type plug fuse. Understanding these ratings helps in ensuring the safety and efficiency of electrical installations, aligning with the practices and codes outlined in the Canada Electrical Trade.