A single-module circuit breaker includes a first longitudinal portion, a second longitudinal portion, and a third longitudinal portion proximate the first and second longitudinal portions. The first longitudinal portion includes overcurrent detection componentry configured to detect an overcurrent condition. The second longitudinal portion includes leakage current detection componentry configured to detect a leakage current condition. The third longitudinal portion includes a contact mechanism, a first conduction path, and a second conduction path, and the contact mechanism is configured to disrupt the first and second conduction paths in response to at least one of the overcurrent condition and the leakage current condition.