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Considerations for Selecting Littelfuse MOVs and Fuses for Industrial Motor Applications

From Littelfuse, Inc.
 

 
Littelfuse offers specific Varistors and Classes of Fuses to address over-voltage and over-current transients in the Industrial environment. This application area is typically characterized as AC utility service entrance and distribution, and the associated high current inductive loads that can include medium and heavy motors. Transient over-voltage suppression in these applications typically require Industrial Metal Oxide Varistors (MOVs) for induced lightning surges or for switching transients created by the motor itself.These situations demand that the MOV ratings match the surges found in these locations in terms of suitably high energy and surge current values. Similarly, in selecting a load Fuse, it must obviously be of a value that will allow normal operation, including the allowance for certain fault conditions, but at the same time not open for the transient surges that the MOV is intended to suppress.
Products & Services
Fuses protect electrical devices and components from overcurrents and short circuits that occur in improperly operating circuits. Search by Specification | Learn more about Fuses
Circuit breakers are mechanical switching devices capable of breaking currents under specified abnormal circuit conditions. Search by Specification | Learn more about Circuit Breakers
Ground fault relays protect electrical equipment from ground faults. A ground fault is an unintentional current path between a current-carrying conductor and a grounded surface. Search by Specification | Learn more about Ground Fault Relays
Ground fault circuit interrupters (GFCI) disconnect a circuit when the current between the neutral conductor and the live conductor becomes unbalanced. GFCIs are also known as residual current devices. Search by Specification | Learn more about Ground Fault Circuit Interrupters (GFCI)
Fuse holders are devices for containing, protecting and mounting fuses. Blown fuses can be changed quickly and easily when used in conjunction with a fuse holder. Search by Specification | Learn more about Fuse Holders
Product Announcements
Schurter, Inc. - Varistors – New Surge Protection for Circuits
Schurter has expanded its product portfolio to include radial leaded varistors, also referred to as MOV (Metal Oxide Varistors). The addition adds yet another form of circuit protection to Schurter's... (read more)
Citel America, Inc. - Single Phase AC Surge Protector Box - MSB Series
Citel MSB series have been designed to protect single-phase circuits (16-amp current limit) against harmful lightning surges and electrical transients. Consists of a hybrid technology that combines a... (read more)
Citel America, Inc. - SurgePurge 330
Citel's SurgePurge 330 model provides "Zero-margin" surge suppression capability for your facility's service entrance for both conducted (10/350µs) and induced (8/20µs) transient overvoltages... (read more)
Hitech (HK) Co., Ltd. - Metal Oxide Varistors (MOVs)
Metal Oxide Varistors (MOVs) UL Certification for our GDT and MOV. (read more)
Bel Fuse Inc. - Type RJS Fuses
RJS Fuses are primarily intended for use in telecommunication circuit applications requiring low current protection with high surge tolerance. They are typically used to replace heat coil type... (read more)
TLC Electronics - Thermally Protected Varistors
World Products Inc. TVZ series is a two or three-leaded Thermally Protected Metal Oxide Varistor available from authorized distributor TLC Electronics, Inc. (read more)
Ferraz Shawmut - Thermally Protected MOV from Ferraz Shawmut
The Ferraz Shawmut Thermally Protected MOV has been developed to assist in minimizing the failure characteristics of Metal-Oxide-Varistors. The TPMOV is a completely fail-safe device. It is composed... (read more)
MCG Surge Protection - Easy DC Surge Protection
Direct current equipment level surge protectors are designed to protect up to 15A of continuous DC load current. The MCG-12A-MCG-130A installs at or within equipment such as DC servo mechanisms, fire... (read more)
Automationdirect.com - Industrial Fuses, Fuse Holders, Fuse Blocks -
Save up to 50% on time-delay & fast-acting fuses. New higher amp current limiting fuses are rated from 200-600 Amps. All fuses are cross referenced as replacements for name-brand fuses like... (read more)
 
Topics of Interest
Metal Oxide Varistors (MOVs) are commonly used to suppress transients in many applications such as: Transient Voltage Surge Suppressors (TVSS), Uninterruptible Power Supplies (UPS), AC Power Taps, AC... (Read More)
This guide is similar to "The ABCs of MOVs", offering specific information on Multilayer suppressor device technology and is intended to be a supplement to the Littelfuse Multilayer data sheets. As... (Read More)
Transient voltage surge suppressors (TVSSs) using MOV technology are widely used to protect power systems and components against the effects of transient overvoltages. However MOVs can fail... (Read More)
The sole function of a quality surge suppressor is to protect sensitive electronic equipment from transient overvoltages that are present on AC power circuits. It is irrelevant whether these... (Read More)
The material in this guide has been arranged in 3 parts for easy reference; Section A, Section B and Section C. "A" is for Applications This section provides general guidelines on what types of MOV... (Read More)
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