Switching and dielectric properties of a compound (S)-(+)-4-(1-methylheptyl) 4-[4-(3-hexanoyloxy prop-1-oxy) benzoyloxy]biphenylate are studied by means of polarization reversal methods and dielectric spectroscopy respectively. Two characteristics polarization peaks have been observed on application of triangular pulse in the [image omitted] phase. The separation between two peaks has been decreases with increase in frequency and electric field. These two peaks merge into each other after a critical field of 200kV/cm. A relaxation mechanism has been detected under planar orientation of molecules for [image omitted] phase in the high kHz region. This mode shows two different behaviors in two temperature ranges.