NA Varistors - NA Series - High Energy Industrial Square Disc Varistor Series

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Series: NA

NA Series - High Energy Industrial Square Disc Varistor Series

Obsolete 2007-01-10

The NA Series of transient surge suppressors are varistors (MOVs) in square disc form, intended for special industrial high-energy applications requiring unique electrical contact or packaging methods provided by the customer.

The electrode finish of these devices is solderable and can also be used with pressure contacts.
Discs may also be stacked.

The NA Series varisor is a square 34mm device, with thicknesses ranging from 1.8mm minimum for the 130V device to 7.5mm maximum for the 750V device. For information on mounting considerations refer to Application Note AN 8820.

This disc is also available with encapsulation and PCB leads.

Electrical Characteristics

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Check distributor stock availability by clicking on the [CHECK] link. View certification PDF files by clicking on the certification logo. View the part details by clicking on the part number. To order sample parts, click on the [ADD] link. Click on the 'Key' button to view definitions for each column header. Sort parts by clicking on the column you wish to sort by.

CatalogNo	Size	V_MAX AC (V)	V_MAX DC (V)	W_TM (J)	(I_TM 1xAmps (A)	V_NDC (V)	V_NDC MIN (V)	V_NDC MAX (V)	V_c (V)	Stock	Sample Cart
V131NA34 : 2007-01-10	34mm	130	175	270	40000	200	184	228	345	[Check]	[Add]
V141NA34 : 2007-01-10	34mm	140	188	291	40000	220	198	248	375	[Check]	[Add]
V151NA34 : 2007-01-10	34mm	150	200	300	40000	240	212	268	405	[Check]	[Add]
V251NA34 : 2007-01-10	34mm	250	330	370	40000	390	354	429	650	[Check]	[Add]
V271NA34 : 2007-01-10	34mm	275	369	400	40000	430	389	473	730	[Check]	[Add]
V321NA34 : 2007-01-10	34mm	320	420	460	40000	510	462	561	830	[Check]	[Add]
V421NA34 : 2007-01-10	34mm	420	560	600	40000	680	610	748	1130	[Check]	[Add]
V481NA34 : 2007-01-10	34mm	480	640	650	40000	750	670	825	1240	[Check]	[Add]
V511NA34 : 2007-01-10	34mm	510	675	700	40000	820	735	910	1350	[Check]	[Add]
V571NA34 : 2007-01-10	34mm	575	730	770	40000	910	805	1000	1480	[Check]	[Add]
V661NA34 : 2007-01-10	34mm	660	850	900	40000	1050	940	1160	1720	[Check]	[Add]
V751NA34 : 2007-01-10	34mm	750	970	1050	40000	1200	1080	1320	2000	[Check]	[Add]

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Technical Resources

Application Notes

Plant Certifications

Environmental Data

Environmental Info

	AN9311 - The ABCs of MOVs The material in this application guide has been arranged in 3 parts for easy reference; Section A provides general guidelines on what types of MOV products are best suited for particular environments. Section B explains what Metal Oxide Varistors are and the basic function they perform. And section C helps clarify important information about MOVs for the design engineer, and answers questions that are asked most often. an9311.pdf (67 K)
	AN9767 - Littelfuse Varistors: Basic Properties, Terminology and Theory This application note describes the basic properties of varistors. Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to back-to-back zener diodes. The symmetrical, sharp breakdown characteristics enable the varistor to provide excellent transient suppression performance. Littelfuse_app-note_an9767.pdf (1,094 K)
	AN9768 - Transient Suppression Devices and Principles This application note discusses the two major categories of transient suppressors: a) those that attenuate transients, thus preventing their propagation into the sensitive circuit; and b) those that divert transients away from sensitive loads and so limit the residual voltages. an9768.pdf (125 K)
	AN9769 - An Overview of Electromagnetic and Lightning Induced Voltage Transients This application note is an overview of the sources and nature of various transient overvoltages, and the problems that may result. an9769.pdf (180 K)
	AN9773 - Varistor Testing This application note details the common tests of varistor parameters and describes suitable test methods using simplified test circuits. All tests are performed at 25° C, unless otherwise specified. The test circuits and methods given are intended as a general guide. Since the tests frequently entail high voltages and currents, users must exercise appropriate safety precautions. an9773.pdf (274 K)
	EC608 - Considerations for Selecting Littelfuse MOVs and Fuses for Industrial Motor Applications This application note discusses the first level considerations for applying both Littelfuse Industrial AC Line Metal Oxide Varistors and associated AC line Fuses with a motor protection example. ec608.pdf (171 K)
	EC637 - Recommendations for Soldering Terminal Leads to MOV Varistor Discs This technical brief presents the CA and NA series of MOV varistor discs and discusses how they are specifically designed for custom assembly and packaging. It outlines how to take advantage of the excellent performance and reliability of Littelfuse varistor technology by choosing the correct materials and processes when soldering terminal leads to the disc. EC637.pdf (119 K)
	EC638 - Littelfuse Varistor Design Examples This application note is a guide for selecting a varistor by describing common application examples, and illustrating the solution process to determine the appropriate varistor. The note also describes series/parallel connection rules. EC638.pdf (356 K)
	EC640 - Combining GDTs and MOVs for Surge Protection of AC Lines This application note illustrates how to design high performance, cost-effective surge protection for equipment connected to AC power lines. The role of gas discharge tube (GDT) surge arresters specifically designed for AC power line protection is also be discussed. EC640.pdf (158 K)

	Dongguan, BeiCe ISO 14001-2004 MOV Factory Littelfuse_Dongguan-BeiCe-MOV_ISO14001-2004.pdf (103 K)
	Dongguan, BeiCe ISO 9001-2000 MOV/MLV Factory Littelfuse_Dongguan-BeiCe-MOV_ISO9001-2000.pdf (339 K)
	Dongguan, BeiCe ISO TS16949 Littelfuse_Dongguan-BeiCe-MOV_ISO-TS16949.pdf (209 K)