A laser system, comprising: a rack; a plurality of laser modules mounted in the rack to drive light through an optical fiber exiting the system; and a power distribution module disposed within the rack to distribute input electricity through circuit branches coupled to the laser modules, wherein the power distribution module is characterized by further comprising: an enclosure; one or more rails (204, 304, 400A, 400B) mounted within the enclosure, wherein the rails bifurcate (204, 304, 400A, 400B) an interior volume (202, 302) of the enclosure into front and back volumes; and one or more circuit components associated with each circuit branch disposed within the enclosure, each of the circuit components including a rail-mount by which the circuit component is affixed to the one or more rails (204, 304, 400A, 400B), wherein a rail-mount of a first of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the first of the circuit components occupies a portion of the front volume, and wherein a rail-mount of a second of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the second of the circuit components occupies a portion of the back volume. a rack; a plurality of laser modules mounted in the rack to drive light through an optical fiber exiting the system; and a power distribution module disposed within the rack to distribute input electricity through circuit branches coupled to the laser modules, wherein the power distribution module is characterized by further comprising: an enclosure; one or more rails (204, 304, 400A, 400B) mounted within the enclosure, wherein the rails bifurcate (204, 304, 400A, 400B) an interior volume (202, 302) of the enclosure into front and back volumes; and one or more circuit components associated with each circuit branch disposed within the enclosure, each of the circuit components including a rail-mount by which the circuit component is affixed to the one or more rails (204, 304, 400A, 400B), wherein a rail-mount of a first of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the first of the circuit components occupies a portion of the front volume, and wherein a rail-mount of a second of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the second of the circuit components occupies a portion of the back volume. an enclosure; one or more rails (204, 304, 400A, 400B) mounted within the enclosure, wherein the rails bifurcate (204, 304, 400A, 400B) an interior volume (202, 302) of the enclosure into front and back volumes; and one or more circuit components associated with each circuit branch disposed within the enclosure, each of the circuit components including a rail-mount by which the circuit component is affixed to the one or more rails (204, 304, 400A, 400B), wherein a rail-mount of a first of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the first of the circuit components occupies a portion of the front volume, and wherein a rail-mount of a second of the circuit components is affixed to the one or more rails (204, 304, 400A, 400B) and the second of the circuit components occupies a portion of the back volume.