Technical Data 2027
Effective May 2017
Supersedes April 2009
Product features
Agency information
•UL Listed Card: Guide JDYX, File E19180
•CSA Certification Card: Class 1422-01, 53787
Ordering
•Specify product code: Insert packaging code prefix
before part number. E.g. BK (or BK1)/C520-500-R
C520
5 mm x 15 mm Fast-acting glass tube fuses
•Fast-acting
•5 x 14.48mm physical size
•Glass tube, nickel-plated brass endcap construction
•UL Listed product meets standard UL 248-14
Electrical Characteristics
Rated Current Amp Rating Opening Time
100% None
100mA - 5A 135% 1 hours max.
200% 2 seconds max.
Specications
Interrupting RatingVoltage Typical DC Cold Typical Typical
Part Number Rating at Rated Voltage (amps) Resistance* Melting I 2t** Voltage
Vac 250Vac 125Vac AC Drop (mV)***
C520-100-R 250 35 10,000 22.30 0.0010 2230
C520-125-R 250 35 10,000 15.20 0.0019 1930
C520-250-R 250 35 10,000 5.60 0.012 1450
C520-375-R 250 35 10,000 2.53 0.039 968
C520-500-R 250 35 10,000 1.66 0.059 845
C520-750-R 250 35 10,000 0.91 0.264 686
C520-1.5-R 250 100 10,000 0.900 0.800 135
C520-2-R 250 100 10,000 0.064 1.9 136
C520-2.5-R 250 100 10,000 0.046 2.9 121
C520-3-R 250 100 10,000 0.038 6.1 116
C520-3.5-R 250 100 10,000 0.032 9.7 115
C520-4-R 250 200 10,000 0.022 16.6 88
C520-5-R 250 200 10,000 0.018 22.4 91
* DC Cold Resistance (Measured at <10% of rated current)
** Typical Melting I 2t (A2Sec) (maximum I 2t at 10 times rated current)
*** Typical Voltage Drop (Voltage drop was measured at 25°C±3°C ambient temperature at rated current)
(Ω)
Eaton
Electronics Division
1000 Eaton Boulevard
Cleveland, OH 44122
United States
www.eaton.com/electronics
© 2017 Eaton
All Rights Reserved
Printed in USA
Publication No. 2027 BU-SB09252
May 2017
Eaton is a registered trademark.
All other trademarks are property
of their respective owners.
Life Support Policy: Eaton does not authorize the use of any of its products for use in life support devices or systems without the express written
approval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly
used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user.
Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Eaton also
reserves the right to change or update, without notice, any technical information contained in this bulletin.
C520
5 mm x 15 mm Fast-acting glass tube fuses
Technical Data 2027
Effective May 2017
5.0 (Typ.)
14.48 5.2
Dimensions - mm
Drawing Not to Scale
Time-Current Curve
Amp
Rating
Current in Amps
Time in Seconds
Packaging Code
Packaging Code PrexDescription
BK 100 fuses packed into a cardboard carton
BK11,000 fuses packed into a cardboard carton
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Eaton:
BK/C520-3A BK/C520-250MA BK/C520-500MA BK/C520-375MA BK/C520-2A BK/C520-2.5-R BK/C520-100-R
BK/C520-2-R BK/C520-250-R BK/C520-3-R BK/C520-3.5-R BK/C520-375-R BK/C520-4-R BK/C520-500-R
BK/C520-125-R BK/C520-5-R BK/C520-750-R BK-C520-1-5-R BK1-C520-250-R BK1-C520-3-R BK1-C520-500-R
BK-C520-1 BK/C520-5A BK/C520-4A BK/C520-125MA BK/C520-750MA BK/C520-1 BK1/C520-500-R BK1/C520-
3-R BK1/C520-250-R BK1/C520B-1A BK/C520-1.5-R