C05 Standards and Approvals
Target Audience: Advanced Level
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
1
Different Approaches
IEC/EN and UL
> UL protects people from fires
> Historical Background
UL was originally (around 1900) a building insurance company.
As electricity came up and wooden houses often burnt down,
UL defined standards for electrical equipments and in-house
wiring.
> IEC protects people from electrical shocks
> Trend
With IEC/EN standards, the number of accidents have been
reduced, however the quantity of fires has not been decreased.
Therefore, IEC increases now the requirement for protection
against fires.
E.g. the fire resistance for plastic parts in household equipment
have to meet the new requirement according to IEC 60335-1.
See C12 Fuseholder Facts
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
2
Standards for Components
IEC/EN and UL
> IEC 60127-1
Base standard for miniature fuses <250 V
> IEC 60127-2/x
Standard for 5x20 mm fuses
> IEC 60127-3/x
> IEC 60127-4/x
> IEC 60127-5
Standard for Microfuses like MST 250
UMF (Ultra Modular Fuse) Standard
FRT, OMF 250, UMT 250, USI 1206
Guidelines for quality assessment
> IEC 60127-6
Fuseholders
> UL 248-1
> UL 248-14 and
CSA C22.2 No. 248.14
> UL 512
CSA C22.2 No. 39
Base standard for all fuses
Fuses, ≤ 600 V
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
Fuseholders
SBU Fuses / C05 / Standards and Approvals
3
VDE Approvals
IEC
>
The IEC organisation writes specifications, but does not certify products. Certification
according to IEC specification are given by such organisations as VDE.
>
VDE Mark:
>
VDE Certificate of Conformity in conjunction with factory surveillance:
This symbol, granted by the German agency, guarantees that a fuse or
fuseholder has been manufactured partly compliance with the
appropriate section of the IEC 60127-x standard.
>
UMF = Universal Modular Fuse:
This symbol indicates full compliancy with the IEC 60127-4 standard.
This also allows to apply for a UL LISTED without any further tests at UL.
>
See more about standards and approvals
http://www.elmgnz.com/faq-compliance.html#29
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
This symbol, granted by the German agency, guarantees that a fuse or
fuseholder has been manufactured in full compliance with the
appropriate section of the IEC 60127-x standard.
SBU Fuses / C05 / Standards and Approvals
4
UL/CSA Approvals
>
The UL/CSA organisation writes specifications and certify products.
>
UL LISTED:
This symbol, granted by the U.S. agency, guarantees that a fuse
has been manufactured in full compliance with the UL 248-14 /
CSA C22.2 No. 248.14 standard FUSES FOR SUPPLEMENTARY
OVERCURRENT PROTECTION.
>
UL Recognised:
UL’s Component Recognition Program allows the testing of
components for which no UL standard exists or where only certain
sections of a particular UL standard are referenced.
A fuse or holder may be submitted to UL for testing according to
criteria defined by the manufacturer. If basic safety requirements are
met during testing and the component performs as predicted, it can
be UL Recognised.
Normally, parts bearing these marks are incorporated into
equipment manufactured by an OEM and determined based on the
electrical characteristics of the product design to provide protection
for the components in the equipment.
Fuses built to IEC are technically qualified to apply for
UL Recognition.
CSA
for Canada
UL
for the US
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
5
Asian Approvals
>
The CQC (China Quality Certification Centre) writes specifications (GB-standards) and
certify products. CQC refers mainly to the IEC standard.
CCC stands for the China Compulsory Product Certification.
CCC
Free of CCC (Confirmation)
Is a component not included in the GB-standard, then a manufacturer can
apply for a Free of CCC confirmation, which allows imports into China.
>
METI (Ministry of Economy, Trade and Industry) writes specifications (J-standards) and is
law of Japan. PSE certificates does not belong to the product, it belongs
to the importer into Japan.
Certification according to J-standards are given by such organisations as
JET, JQA or TUV Japan. METI refers mainly to the IEC standard.
>
The KTL (Korea Testing Laboratory) writes specifications and certify products.
KTL refers mainly to the IEC standard.
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
6
IEC Test Procedure
>
IEC ampere rating tests are conducted at different multiple current level of rated current
based on the different IEC standard sheets.
The most important are at 150%, 275%, 400%, and 1000%.
>
IEC defines the following characteristic at 10*In:
> Super-quick-acting FF
≤ 1 ms
> Quick-acting F
1 – 10 ms
> Time-lag T
10 – 100 ms
> Super time-lag TT
≥ 100 ms
>
IEC defines three level of breaking capacities: Low (35 A, Marking L), enhanced (150 A)
and high (1500 A, Marking H). Schurter offers only low and high breaking capacity fuses.
>
Additionally, IEC defines max. voltage drop at 1.0*In, max. power dissipation at 1.5*In,
and max. temperature rise.
→ A fuse with IEC characteristic can constantly be operated
at 100% of rated current.
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
7
UL Test Procedure
>
UL ampere rating tests are conducted at 100%, 135%, and 200% of rated current. The
fuse must carry 110% of its ampere rating and must stabilize at a temperature that does
not exceed a 75K rise at 100%. The fuse must open at 135% of rated current within one
hour. It also must open at 200% of rated current within 2 minutes.
>
The interrupting rating of a UL LISTED fuse is 10 kA at min. 125 V. The following I.R.
have to be met for fuses rated at 250 V.
> 0 – 1 A (I.R. 35 A)
> 1.1 – 3.5 A (I.R. 100 A)
> 3.6 – 10 A (I.R. 200 A)
> 10.1 – 15 A (I.R. 750 A)
> 15.1 – 30 A (I.R. 1500 A)
→ A fuse with UL characteristic can constantly be operated
at 75% of rated current.
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
8
Pre-arcing Times IEC and UL
>
FSF 5x20
IEC 60127-2/2
quick-acting F
>
FST 5x20
IEC 60127-2/3
time-lag T
>
FSK 5x20
UL 248-14
fast-acting
>
Main Difference
between IEC and UL
FSL 5x20
UL 248-14
time-delay
Rev. 1.1 / Last Update: 15.02.2007
Thomas Hubmann
SBU Fuses / C05 / Standards and Approvals
9