Products

A varistor is a passive surge protective device. Its primary purpose is to protect against voltage transients. A varistor typically has two operating conditions: standby and active. In its standby mode, the varistor is non-conductive (highly resistive) and is virtually transparent to the circuit. During its active state, the varistor is highly conductive and shunts most of the transient current away from the circuit, thereby only allowing a finite voltage applied to the circuit. After the transient event, the varistor returns to its standby mode.

THERMALLY PROTECTED SERIES:

The Thermally Protected Series is designed for safe disconnection of the varistor from the circuit due to abnormal operating conditions. These components consist of 2 or 3 leaded wire leads, a thermal disconnect, and have nominal diameters of 14mm, 20mm, and 25mm. Voltage ranges from 60VAC- 750VAC with peak surge currents of 4.5kA/6kA (14mm), 10kA (20mm), and 18kA (25mm). The Thermally Protected Series is designed to MDC handle similar through-hole applications as a FV standard varistor.

STANDARD SERIES:

The Standard Series is our broadest and most comprehensive line of radial-leaded varistors. Consisting of wire leads with nominal disk diameters from 3mm to 25mm, they are available with maximum continuous operating voltages (MCOV) ranging from 11VAC to 1000VAC. The Standard Series is designed to handle most low and medium power applications requiring through-hole components. Products comply with UL Type 2 and Type 3 listings. The Standard Series is available in bulk and industry standard tape and reel configurations for automatic insertion.

LOW PROFILE SERIES:

The Low Profile series complements our Standard Series of varistors. These varistors are square in shape allowing them to fit into smaller spaces than the equivalent round varistors. They offer a lower seating height and smaller width on the PC board. Voltages series range from 130VAC to 1000VAC. Four sizes are available; 12mm, 17mm, 22mm, and 25mm. The Low Profile Series is available in bulk and industry standard tape and reel configurations for automatic insertion.

HC SERIES:

The HC Series of varistors were designed to withstand the rigors of higher pulse repetition requirements, and higher one pulse peak surge currents. The HC Series can handle higher peak currents than our standard series of varistors of the same diameter. Customers that need to meet UL943 requirements find these particularly useful. These are available in round disc sizes of 8, 10, 11, 12, 14, 16, 18,20mm, and 25mm diameters with voltages ranging from of 130VAC to 550VAC. Square discs are also available in sizes of 9, 10, 11, 12, 14, 17, 20, 22, and 25mm with voltages ranging from 130VAC to 550VAC. Products comply with UL Type 2 and Type 3 listings. The HC Series is available in bulk and limited tape and reel configurations for automatic insertion.

HIGH ENERGY SERIES:

The High Energy Series large tab-leaded varistors are designed to handle high peak currents and have the ability to absorb large amounts of energy. These are available in both round and square shapes to allow mounting in various spaces and in dual configurations. Available in 32mm, 40mm, and 53mm single-disk configurations; 25mm and 34mm single-square configurations; 40mm dual-disk configuration; and 25mm and 34mm dual-square configurations. Voltages range from 130VAC to 1000VAC.

SMV SERIES:

The SMV Series are monoblock ceramic chips terminated on each end. Designed for Surface Mount applications they available in voltages from 10 to 275 VAC. Dimensions are 0.320 in. x 0.200 in. with a 0.080 in. maximum thickness. SMV Varistors are available in bulk and industry standard carrier tape for automatic insertion.