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I don't know if the power to protect a 'realm' was an inherent effect of the Three so much as an enhancing of the will of their keepers. Elrond's duty as master of his house was to protect it from evil, and his ring complemented that effort; likewise for Galadriel. Narya may have had a similar effect while in Cirdan's possession. However, Tolkien tells us somewhere that Narya's power was in motivating hearts and inciting action. But he also tells us that that was Olorin's specialty back in Aman, which suggests that the actual power of one of the Three depended even more strictly on the intentions of its bearer.
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