Chiral nematic liquid crystals (CLCs) are highly promising tunable photonic materials that own various states and exhibit different optical properties in each state. The natural bistability between planar and focal conic states is widely exploited in power-saving applications. This work proposes another bistable electrical switching mode that involves two planar states that are realized by pitch jumps in polymer-stabilized chiral nematic liquid crystals (PSCLCs) with negative anisotropy. Under an appropriate polymerization condition, a polymer network can be formed throughout the CLC cell; it not only eliminates the original pitch jump behavior that is associated with thermal hysteresis in CLCs but also provides a balance between two planar states in the neighborhood of a pitch jump. The helical pitch of the PSCLC can be reversibly switched from the long pitch to the short pitch by applying pulse direct current (DC) voltages. The switching mechanism involves field-induced distortion in the polymer network, which generates the mechanical force that causes the pitch jump transition. Both planar states with different pitches can shift the wavelength of Bragg reflection, which depends strongly on the thickness of the PSCLC cells. A tunable laser that is based on a dye-doped PSCLC cell is fabricated and its wavelength-tuning ability is demonstrated.