Covers the following types of enclosed low-voltage dc power circuit breakers: a) stationary or drawout type of one- or two-pole construction; b) having one or more rated maximum voltages of 3200 V, 1600 V, 1200 V, 1000 V, 800 V, 325 V, or 300V for applications on systems having nominal voltages of 3000V, 1500 V, 1000 V, 850 V, 750 V, 275 V, or 250V; c) manually-operated or power-operated; and d) with or without overcurrent trip devices.