Häufig gestellte Fragen

Finden Sie die Antworten auf Ihre Fragen, indem Sie auf eine der häufig gestellten Fragen klicken. Sollten Sie nicht finden, was Sie suchen, so stehen Ihnen die Mitarbeiter von Littelfuse wie immer gerne zur Verfügung. Klicken Sie hier, um zum Abschnitt „Support“ zu gelangen. Dort werden Sie aufgefordert, eine Region zu wählen, damit wir Ihre Anfrage an den zuständigen Mitarbeiter weiterleiten können. Bitten Sie einen Mitarbeiter unseres Technischen Supports, Ihre Frage in unsere Datenbank der häufig gestellten Fragen aufzunehmen.

 


Können Sicherungen mit AC-Nennspannung in DC-Anwendungen eingesetzt werden?

Sicherungen müssen mit der Spannung, mit der sie verwendet werden (AC oder DC) gekennzeichnet sein. Üblicherweise haben Sicherungen eine DC-Spannung, die die Hälfte der maximalen AC-Nennspannung ausmacht. (Beispiel: LLSRK_ID – 600 VAC, 300 VDC) Wenden Sie sich für weitere Informationen Zur DC-Nennspannung an den Hersteller.



Hat Littelfuse eine Richtlinie zu Umweltgesundheit und Sicherheit ausgearbeitet?

Yes, Please see the attached PDF

Littelfuse Environmental, Health and Safety Policy

Umweltgesundheit und SicherheitEHSPolicy.pdf


Muss die Sicherungleistung herabgesetzt werden, wenn die Betriebstemperatur dies erfordert?

Yes, This information is in a table on page 4 in the Electronic Designers Guide in the Fuseology section but there is no mention of its existence anywhere outside of this section. A pdf of the page is attached for your convenience.

Temperature Derating For Electronic Fuses

Umweltgesundheit und SicherheitELEC_FUSE_TEMP_DERATING.pdf


What is the fuse marking according to IEC standard 127 and how does this translates to Littelfuse's 5x20mm fuse offerings?

Please see the attached file.

5x20mm IEC Fuse Marking

Umweltgesundheit und SicherheitLittelfuse_5x20mm-IEC-Fuse-Cap-Marking_guide.pdf


Kann die Nennspannung die Anwendungsspannung übersteigen?

Ja – Sicherungen sind für den Einsatz in Schaltungen jeglicher Spannung konzipiert, solang sie die maximale Nennspannung der Sicherung nicht überschreiten. (Ausnahme – Mittelspannungssicherungen zwischen 2.400 und 38.000 Volt dürfen nur bei den auf dem Sicherungsetikett vermerkten Spannungen verwendet werden). Die Nennspannung einer Sicherung basiert auf einer Sicherheitsbewertung und sollt niemals überschritten werden.


Wie wähle ích die Stromstärke der Sicherung, wenn mir die Stromstärke des Stromkreises bekannt ist?

Halten Sie stets die NEC-Richtlinien für die Anwendung von Niederspannungssicherungen ein. Generell sollte die MINIMUM-Sicherungsgröße auf 125 % des vollen Laststroms des Stromkreises basieren. Träge Sicherungen sollten für induktive Lasten verwendet werden und flinke Sicherungen sollten verwendet werden, um nichtinduktive Lasten zu schützen.


Was ist der Unterschied zwischen Unterbrechungsleistung und der Nennspannung einer Sicherung?

Die Unterbrechungsleistung ist die maximale Energiemenge, der das Gerät sicher standhalten kann. Die Nennspannung der Sicherung ist die Strommenge, die die Sicherung hindurchlässt, bevor sie anfängt zu arbeiten. Beide Stromstärken werden durch Tests ermittelt.


Warum ist die Unterbrechungsleistung wichtig?

Die Unterbrechungsleistung ist wichtig, weil es sich eine Sicherheitsbewertung handelt. Wenn ein Gerät mit einer geringen Unterbrechungsleistung in einem Stromkreis verwendet werden soll, der einen stärkeren Fehlerstrom bietet (die Menge an Energie, die potenziell zur Verfügung steht, falls ein Fehler auftreten sollte), könnte das Gerät zerstört werden (Bruch oder Explosion), während es versucht, die Störung zu beheben, was ein Sicherheitsrisiko darstellt.


Are fuse reducers required for downsizing ampere ratings of Class L fuses?

No, fuse reducers are not required or available. The bolt hole patterns of Class L fuses are designed to allow you use smaller ampere ratings.


Do fuseholders require derating?

Yes, fuseholders do require derating. Often times derating for a fuseholder is overlooked by an engineer because it does not specified on the datasheet. Please review the attached document for derating of fuseholders.

Fuseholder Rerating

Fuseholder Reratingfuseholder_rerating.pdf


Does Littelfuse offer Class L fuseblocks?

No - No fuse manufacturer offers Class L fuse blocks. Class L fuses are bolted directly on buss bars or used with bolted-pressure contact switches.


What is the purpose of fuseblock's rejection feature?

A rejection feature is used to prevent fuses with a lower voltage or interrupting rating (such as Class H and Midget fuses) from being used in a circuit that needs a higher rating. Class R and CC fuseblocks incorporate a built-in rejection feature while Class J and T blocks reject based on physical size.


Will Class CC fuses fit in Midget fuseholders?

Yes - Class CC fuses will fit into Midget fuseholders however Midget fuses will NOT fit into a Class CC holder due to the block's rejection feature.


How can I find out which fuse block or holder I can use with any of your fuse series?

The attached file is a cross reference of the appropriate fuseholder or fuse block that can be used with any Littelfuse brand fuse series.

Fuseholder Cross ReferenceLittelfuse_fuseholder_cross-reference.pdf


Does Littelfuse have any legal disclaimers or notices about information on www.littelfuse.com?

Yes, Please read the following Legal Disclaimer for www.littelfuse.com.

LEGAL DISCLAIMERS AND NOTICES By accessing, viewing or otherwise using this web site you are agreeing to the following. Bitte lesen Sie diesen Haftungsausschluss und Hinweise sorgfältig durch:

1. This web site is owned by and under the control of Littelfuse, Inc. ("Littelfuse"). Access to and use of this web site and all of Littelfuse's content, services, materials, information, databases and systems are subject to these Disclaimers and Notices, any Agreements and applicable laws and regulations (including all export and import laws, regulations and restrictions), all of which are subject to change and revision from time to time without prior notice. From time to time, Littelfuse may (a) supplement or make changes to these Disclaimers and Notices and other rules or access and use procedures, documentation, security procedures and standards for equipment, (b) change the type and location of Littelfuse's system equipment, facilities or software, or (c) modify or withdraw any particular service or product referred to in this web site or any Littelfuse database, material, service or system. Littelfuse reserves the right to terminate access to this web site or take other actions it reasonably believes necessary to comply with the law or to protect its rights or customers. Any access or attempt to access or use this web site for any unauthorized or illegal purpose is strictly prohibited.

2. This web site is provided without charge as a convenience to users to be used for the purposes of information, education and communication. While Littelfuse's information and advice contained in this web site have been prepared and compiled from sources believed to be reliable, Littelfuse makes no guarantee as to, and assumes no responsibility for, the correctness, sufficiency or completeness of such information, material or recommendations. Littelfuse does not represent or endorse the accuracy or reliability of any of the information, content or advertisements contained on, distributed through, or linked, downloaded or accessed from this web site, nor the quality of any products, information or other materials or services displayed, obtained or purchased by you as a result of your use of this web site or any Littelfuse service, database, materials or system. Sie stimmen hiermit zu, dass Sie allen Informationen oder Materialien auf Ihre alleinige Gefahr hin vertrauen. Littelfuse reserves the right, in its sole discretion and without any obligation, to correct any error or omissions in any portion of this web site or any Littelfuse service, database, materials or system at any time, with or without notice to you.

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© 2003 Littelfuse, Inc. All Rights Reserved.


Can a time delay fuse be used to replace a fast acting fuse?

Fast-acting fuses are generally used to protect sensitive components from damage so replacing fast-acting fuses with a time-delay fuse could result in damage to your equipment. NEC guidelines are also different for applying fast-acting and time delay fuses. Fuse sizing may vary. It is best to thoroughly understand the circuit before making a decision to switch from a fast-acting fuse to one with time delay.


What is the meaning for the different color bands around the PICO II 255/266 Series?

The PICO II 256/266 series was originally introduced with color coded bands on the part to denote current rating but has been replaced with the 251/253 series which has the amp rating laser marked on the epoxy. Littelfuse still offers the color coded 256/266 series for those customers that either cannot afford to design in the replacement part or prefer to use the banded product. The attached datasheet explains the color coding system.

PICO II (R) Very Fast-Acting 255/256 Series

PICO II255catalog.pdf


Gibt es eine Erklärung für Ihre Nomenklatur der Teilenummern?

Please See attached document for explanation of fuse part numbers.

PICO IILittelfuse Part Number Explanation


Bietet Littelfuse einen Reihensicherungshalter für 120 VAC an?

The only 120VAC In-Line Fuseholder we offer is the LEB series that holds a Midget or CC class fuse. Customers call for a 3AG size solution and we have nothing to offer.

For customers requiring a 3AG solution Littelfuse does not offer a fuseholder to fit your needs. Electrically, the 155 series In-Line fuseholder can handle the voltage but they are all rated at 32 Volts because of the risk of shock to the user when the holder is opened.


Does Littelfuse offer fuse dummies?

Yes - Littelfuse offers dummy fuses for Midget style fuses (LNNB series).


Are fuse reducers available for Class T fuses?

No, fuse reducers are not available for Class T fuses.


What is the difference between Littelfuse's IDSR and FLSR ID Class RK5 fuses?

The difference is that the IDSR fuse series is the only Indicating Class RK5 fuse that is rated for 600VDC and 600VAC operation. The FLSR_ID fuse has a DC rating of 300VDC. Both the IDSR and FLSR_ID are also MSHA approved.


What is the difference between UL Class RK1 and RK5 fuses?

Class RK1 and RK5 fuses are the same physical size but Class RK1 fuses are more current-limiting than Class RK5 fuses. RK1 fuses can provide better protection because they allow less damaging energy to pass through them while opening (blowing).


Which fuse class offers better time delay?

Class RK5, RK1, and J fuses offer the most amount of time-delay. These fuses are required by UL (Underwriters Laboratories) to have a minimum of 10 seconds time delay at 500% of the fuse's rating.


Hat Littelfuse für www.littelfuse.com eine Datenschutzrichtlinie herausgegeben?

Yes. Please read the following:

This web site is the responsibility of Littelfuse, Inc. ("Littelfuse"). Littelfuse can be contacted by mail at 8755 West Higgins Road Suite 500, Chicago, IL, 60631 USA, by phone at 773-628-1000 or by e-mail at legal@littelfuse.com. The web server on which this web site is housed, owned and maintained by Littelfuse, Inc. The following policies apply to www.littelfuse.com.

1. Collection of Personal Information from Site Users

Littelfuse automatically collects and/or tracks (1) the home server domain names, type of computer and type of web browser of users of Littelfuse's web site, (2) the e-mail addresses of users that communicate with Littelfuse via e-mail, (3) information knowingly provided by the user in online forms, registration forms and surveys and (4) user-specific information on what pages users access.

Littelfuse collects information you voluntarily agree to provide us through the forms provided on the web site. Information collected includes limited personal data: your name, company name, address, telephone number, facsimile number and e-mail address.

Littelfuse does not place Internet cookies on users' hard drives.

When a user performs a search on Littelfuse's search engine, Littelfuse records information identifying the user or linking the user to the search performed. As necessary to provide services, Littelfuse does record limited information for every search request.

2. Use of Personal Data Collected

If you contact Littelfuse or voluntarily provide information to us, personal data collected by Littelfuse may be used by Littelfuse for editorial and feedback purposes, for marketing and promotional purposes, for a statistical analysis of users' behavior, for product development, for content improvement, to inform advertisers as to how many users have seen or clicked on their advertisements, and to customize content and layout of Littelfuse's site. Data on users' home servers is aggregated for internal review and then discarded. Names, postal and e-mail addresses, and phone numbers collected may be added to Littelfuse's databases and used for future calls and mailings regarding site updates, new products and services, upcoming events.

3. Disclosure of Personal Data to Third Parties

No personally identifying information will be shared with third parties. We do not sell, trade, or rent the personal information that you provide.

4. Opt-Out Page

Users may opt out of having their personal information collected by Littelfuse, used by Littelfuse for secondary purposes or used by Littelfuse to send promotional communications to the user, by contacting legal@littelfuse.com.

5. Access to and Ability to Correct Personal Data

Upon request via e-mail to legal@littelfuse.com, Littelfuse will provide to users a summary of any personal information retained by Littelfuse regarding the user. Users may modify, correct, change, or update their personal record or cause their personal record to be removed from Littelfuse's database. Littelfuse will only send personal records to the e-mail address on file for the user name associated with it.

6. Collection of Personal Data from Children

Littelfuse's web site is not intended for or marketed to persons under the age of 13.

7. Littelfuse's Right to Contact User

Littelfuse reserves the right to contact site users regarding its privacy policy, or any other policies or agreements relevant to site users.

8. Littelfuse's Right to Change Privacy Policy

Littelfuse reserves the right to change this policy at any time by posting a new privacy policy at this location. Please check this policy from time to time for changes.


Does Littelfuse have a quality policy?

Yes, Littelfuse strives to continuously improve quality and deliver world class products to our customers around the globe. Please see the attached pdf that contains the Littelfuse Quality Policy.

Littelfuse Qualitätsgrundsatz

QualitätspolitikQuality_Policy.pdf


How can you find out what the UL rating would be for an IEC rated fuse (i.e. How can you convert the IEC rating to UL)?

The standard way to do this is to multiply the IEC rating by 1.43 times. This is a good approximation to the UL rating. It gets the customer in the ballpark. The conversion factor is applied to either the UL or IEC fuse rating to arrive at the other rating. The formula is 1.43 X (IEC rating) = (UL rating)


Do you have fuses that can be used in "NEC Class 1 Division 2"?

In regards to fuse protection of motors, appliances and lamps in Class 1 Div 2 Locations (Groups A-D), Section 501.115(B)(3) of the 2005 National Electrical Code states that fuses can be used within general-purpose enclosures if they are a nonindicating, filled, current limiting type. This letter is to inform you that the following fuses are a nonindicating, filled and current limiting type, which meets the requirements of NEC section 501.115(B)(3).

Klasse CC
CCMR 2/10 through 30A
KLKR 1-½ through 30A
KLDR 1/10 through 30A

Class RK1
LLNRK 1/10 through 600A
LLSRK 35 through 600A
KLNR 1 through 600A
KLSR 1 through 600A

Class RK5
FLNR 1/10 through 600A
FLSR 1/10 through 600A

Class L
KLPC 601 through 6000A
KLLU 601 through 4000A

Klasse T
JLLN 1 through 1200A
JLLS 1 through 800A

Klasse J
JLS 1 through 600A
JTD 1 through 600A

Klasse G
SLC ½ through 60A

The attached document provides additional information for your reference.

NEC Class 1 Div 2 Fuses

NEC Class 1 Div 2 FusesLittelfuse Fuses NEC Class 1 Division 2 c.pdf


What are the Littelfuse Terms and Condtions?

See the attached PDFs.

Littelfuse Terms and Conditions of Sale

Terms and Conditions of SaleLittelfuse-Standard-Terms-and-Conditions-of-Sales.pdf