A modular planar interconnect device for a solid oxide fuel cell includes a planar interconnect body, a pair of upper shielding plates, and a pair of lower shielding plates. The planar interconnect body includes a right lateral surface and a left lateral surface. The right lateral surface includes a right lateral slot to fluidly communicate with an introducing slot of the planar interconnect body. The left lateral surface includes a left lateral slot to fluidly communicate with an exit slot of the planar interconnect body.