Microring resonators (MRs) are important photonic devices for large-port-count photonic circuits owing to their micrometer-scale device sizes. We describe the implementation of a wavelength-reconfigurable photonic switch consisting of eight tunable MRs fabricated on a less expensive material platform: silicon on insulator. Wavelength reconfiguration is achieved through independent thermo-optic tuning of MRs with localized Nichrome microheaters fabricated on the same silicon-on-insulator substrate. A free spectral range of and a 3-dB linewidth of were observed for the fabricated MRs with a diameter of approximately . The switch device shows negligible channel crosstalk and moderate switching response time . The switch can potentially be scaled up to benefit the development of large-scale integrated photonics.