Technology: Varistors Series: MA MA Series - Axial Leaded Varistor Series The MA Series of Transient surge suppressors are axial-lead metal oxide varistors (MOVs) for use in a wide variety of board level industrial and commercial electronic equipment. They are intended to protect components and signal/data lines from low energy transients where the small axial lead package is required. The MA Series is offered with standard (S suffix) or tightened (B suffix) clamping voltage. See MA Series Device Ratins and Specifications table for part number and brand information.