6.3 A Fuses

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Mfr Part #	Quantity Available	Price	Series	Package	Product Status	Mounting Type	Fuse Type	Current Rating (Amps)	Voltage Rating - AC	Voltage Rating - DC	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	Approval Agency	Operating Temperature	Color	Size / Dimension
0034.1524 FUSE GLASS 6.3A 250VAC 5X20MM SCHURTER Inc.	68,525 In Stock	1 : £0.41000 Bulk	FSF 5x20	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Fast Blow	5mm x 20mm	63A	53.2	CCC, cURus, PSE/JET, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
5HT 6.3-R FUSE CERAMIC 6.3A 250VAC 5X20MM Bel Fuse Inc.	50,507 In Stock	1 : £0.55000 Bulk	5HT	Bulk	Active	Requires Holder	Cartridge, Ceramic	6.3 A	250 V	-	Slow Blow	5mm x 20mm	1.5kA	181.0	CCC, CE, CSA, cURus, SEMKO, VDE	-55°C ~ 125°C	-	0.201" Dia x 0.787" L (5.10mm x 20.00mm)
0034.3125 FUSE GLASS 6.3A 250VAC 1PC=1UNIT SCHURTER Inc.	10,254 In Stock	1 : £0.59000 Bulk	FST 5x20	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Slow Blow	5mm x 20mm	63A	190.0	CCC, cURus, PSE/JET, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
0678H6300-02 FUSE BRD MT 6.3A 250VAC 125VDC Bel Fuse Inc.	18,596 In Stock	1 : £0.92000 Cut Tape (CT) 2,000 : £0.37880 Tape & Reel (TR)	0678H	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	250 V	125 V	-	2-SMD, Square End Block	100A AC, 1.5kA DC	20.0	AEC-Q200, cURus	-55°C ~ 125°C	-	0.386" L x 0.120" W x 0.120" H (9.80mm x 3.05mm x 3.05mm)
021806.3MXP FUSE GLASS 6.3A 250VAC 5X20MM Littelfuse Inc.	14,448 In Stock	1 : £1.16000 Bulk	218	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Slow Blow	5mm x 20mm	63A	198.5	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
021806.3HXP FUSE GLASS 6.3A 250VAC 5X20MM Littelfuse Inc.	11,239 In Stock	1 : £1.21000 Bulk	218	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Slow Blow	5mm x 20mm	63A	198.5	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
021606.3MXP FUSE CERAMIC 6.3A 250VAC 5X20MM Littelfuse Inc.	2,159 In Stock	1 : £1.57000 Bulk	216	Bulk	Active	Requires Holder	Cartridge, Ceramic	6.3 A	250 V	-	Fast Blow	5mm x 20mm	1.5kA	56.43	BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
047706.3MXP FUSE CERM 6.3A 500VAC 400VDC Littelfuse Inc.	17,921 In Stock	1 : £1.74000 Bulk	477	Bulk	Active	Requires Holder	Cartridge, Ceramic	6.3 A	500 V	400 V	Slow Blow	5mm x 20mm	100A AC, 500A DC	121.451	cULus, PSE, SEMKO	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
021506.3HXP FUSE CERAMIC 6.3A 250VAC 5X20MM Littelfuse Inc.	4,886 In Stock	1 : £1.81000 Bulk	215	Bulk	Active	Requires Holder	Cartridge, Ceramic	6.3 A	250 V	-	Slow Blow	5mm x 20mm	1.5kA	128.75	CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
045106.3MRL FUSE BRD MNT 6.3A 125VAC/VDC SMD Littelfuse Inc.	12,052 In Stock	1 : £1.84000 Cut Tape (CT) 1,000 : £0.70447 Tape & Reel (TR)	NANO²® 451	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	125 V	125 V	Fast Blow	2-SMD, Square End Block	50A	9.17	CSA, PSE, UL	-55°C ~ 125°C	-	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)
045806.3DR FUSE BRD MT 6.3A 32VAC 75VDC Littelfuse Inc.	16,547 In Stock	1 : £2.10000 Cut Tape (CT) 1,500 : £0.76431 Tape & Reel (TR)	NANO²® 458	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	32 V	75 V	Fast Blow	1206 (3216 Metric)	50A	14.37	cULus	-55°C ~ 125°C	-	0.125" L x 0.062" W x 0.062" H (3.18mm x 1.58mm x 1.58mm)
3403.0282.23 FUSE BRD MNT 6.3A 277VAC/125VDC SCHURTER Inc.	4,611 In Stock	1 : £2.41000 Cut Tape (CT) 1,500 : £1.02663 Tape & Reel (TR)	UMT-H	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	277 V	125 V	Slow Blow	2-SMD, Square End Block	1.5kA	165.0	CQC, cURus, VDE	-55°C ~ 125°C	-	0.606" L x 0.211" W x 0.211" H (15.40mm x 5.35mm x 5.35mm)
015406.3DR FUSE BRD MNT 6.3A 125VAC/VDC SMD Littelfuse Inc.	15,554 In Stock	1 : £3.10000 Cut Tape (CT) 1,500 : £1.16856 Tape & Reel (TR)	OMNI-BLOK® 154	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Requires Holder, Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	125 V	125 V	Fast Blow	2-SMD, Square End Block with Holder	50A	9.17	PSE, UL	-55°C ~ 125°C	Tan	0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm)
015706.3DR FUSE BRD MNT 6.3A 125VAC/VDC SMD Littelfuse Inc.	4,284 In Stock	1 : £3.10000 Cut Tape (CT) 1,500 : £1.16856 Tape & Reel (TR)	NANO²® 157	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Requires Holder, Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	125 V	125 V	Fast Blow	2-SMD, Square End Block with Clip	50A	9.17	cULus, PSE	-55°C ~ 125°C	-	0.256" L x 0.146" W x 0.154" H (6.50mm x 3.70mm x 3.90mm)
C310T-SC-6-3-R-TR1 FUSE CERAMIC 6.3A 250VAC AXIAL Eaton - Electronics Division	3,830 In Stock	1 : £0.23000 Cut Tape (CT) 1,500 : £0.09935 Tape & Reel (TR)	C310T-SC	Tape & Reel (TR) Cut Tape (CT)	Active	Through Hole	Cartridge, Ceramic	6.3 A	250 V	-	Slow Blow	Cartridge, Non-Standard (Axial)	63A	123.0	CQC, cURus, KC, TUV, VDE	-55°C ~ 125°C	-	0.142" Dia x 0.394" L (3.60mm x 10.00mm)
BK/S500-6.3-R FUSE GLASS 6.3A 250VAC 5X20MM Eaton - Electronics Division	2,131 In Stock	1 : £0.33000 Bulk	S500	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Fast Blow	5mm x 20mm	63A	69.0	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE	-	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
0679L6300-05 FUSE BRD MNT 6.3A 125VAC/VDC SMD Bel Fuse Inc.	11,669 In Stock	1 : £0.36000 Cut Tape (CT) 5,000 : £0.13400 Tape & Reel (TR)	0679L	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	125 V	125 V	Fast Blow	2-SMD, Square End Block	50A AC, 300A DC	8.3	AEC-Q200, cURus	-55°C ~ 125°C	-	0.240" L x 0.100" W x 0.110" H (6.10mm x 2.54mm x 2.79mm)
0679H6300-05 FUSE BRD MT 6.3A 350VAC 60VDC Bel Fuse Inc.	6,280 In Stock	1 : £0.37000 Cut Tape (CT) 5,000 : £0.13750 Tape & Reel (TR)	0679H	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Surface Mount	Board Mount (Cartridge Style Excluded)	6.3 A	350 V	60 V	Fast Blow	2-SMD, Square End Block	50A AC, 100A DC	8.3	cURus	-55°C ~ 125°C	-	0.240" L x 0.100" W x 0.110" H (6.10mm x 2.54mm x 2.79mm)
0697H6300-01 FUSE BRD MNT 6.3A 350VAC 72VDC Bel Fuse Inc.	2,023 In Stock	1 : £0.40000 Bulk	0697H	Bulk	Active	Through Hole	Board Mount (Cartridge Style Excluded)	6.3 A	350 V	72 V	Slow Blow	Radial, Box	150A AC, 200A DC	180.0	AEC-Q200, cURus	-55°C ~ 125°C	-	0.329" L x 0.157" W x 0.307" H (8.35mm x 4.00mm x 7.80mm)
39216300440 FUSE BOARD MNT 6.3A 250VAC RAD Littelfuse Inc.	2,532 In Stock	1 : £0.44000 Bulk	TE5® 392	Bulk	Active	Through Hole	Board Mount (Cartridge Style Excluded)	6.3 A	250 V	-	Slow Blow	Radial, Box	63A	-	CQC, cURus, KC, PSE, SEMKO, VDE	-40°C ~ 125°C	-	0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
MRT 6.3-AMMO FUSE BOARD MNT 6.3A 250VAC RAD Bel Fuse Inc.	9,309 In Stock	1 : £0.45000 Cut Tape (CT) 1,000 : £0.20101 Tape & Box (TB)	MRT	Cut Tape (CT) Tape & Box (TB)	Active	Through Hole	Board Mount (Cartridge Style Excluded)	6.3 A	250 V	-	Slow Blow	Radial, Can, Vertical	50A	281.0	AEC-Q200, CCC, CE, CSA, cURus, SEMKO, VDE	-55°C ~ 125°C	-	0.329" Dia x 0.303" H (8.35mm x 7.70mm)
MRT 6.3-BULK FUSE BOARD MNT 6.3A 250VAC RAD Bel Fuse Inc.	5,947 In Stock	1 : £0.45000 Bulk	MRT	Bulk	Active	Through Hole	Board Mount (Cartridge Style Excluded)	6.3 A	250 V	-	Slow Blow	Radial, Can, Vertical	50A	281.0	AEC-Q200, CCC, CE, CSA, cURus, SEMKO, VDE	-55°C ~ 125°C	-	0.329" Dia x 0.303" H (8.35mm x 7.70mm)
021706.3MXP FUSE GLASS 6.3A 250VAC 5X20MM Littelfuse Inc.	3,824 In Stock	1 : £0.45000 Bulk	217	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Fast Blow	5mm x 20mm	63A	62.465	BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
021706.3HXP FUSE GLASS 6.3A 250VAC 5X20MM Littelfuse Inc.	4,739 In Stock	1 : £0.47000 Bulk	217	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Fast Blow	5mm x 20mm	63A	62.465	BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE	-55°C ~ 125°C	-	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
0652C6300-11 FUSE GLASS 6.3A 250VAC 5X20MM Bel Fuse Inc.	1,423 In Stock	1 : £0.54000 Bulk	0652C	Bulk	Active	Requires Holder	Cartridge, Glass	6.3 A	250 V	-	Slow Blow	5mm x 20mm	100A	169.0	CE, cULus, UKCA	-55°C ~ 125°C	-	0.197" Dia x 0.787" L (5.00mm x 20.00mm)

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About Fuses

Fuses are fundamental circuit protection devices used in automotive and electronic systems to protect wiring and components from overcurrent, overload, and short circuit conditions. Under normal operation, current flows through a calibrated metal element designed for a specific rating. When current exceeds that limit, due to a short circuit, inrush current, or sustained overload, the element heats and melts, permanently opening the circuit. Because most fuses are non-resettable, they must be replaced after operation. They provide fast, reliable protection for both low-voltage and high-voltage circuits.

Common formats include mini, low-profile mini, ATO/ATC, and maxi fuses. Selection must match:

Current rating (never oversize)
Physical format (fit in fuse block)
Ambient temperature derating (high under-hood temps reduce effective capacity)
Load behavior (steady vs inrush-heavy circuits) using time-current selection curves
PCB / SMD Fuse Selection & Behavior

In electronic circuits, SMD fuses protect low-voltage PCB traces and components. Proper selection depends on:

Rated current and voltage

Fast-acting vs time-delay response
Ambient temperature derating (hot boards reduce fuse capacity)
Surge tolerance using manufacturer time-current curves

These factors ensure the fuse survives normal transients but opens under true fault conditions without damaging the board.

Troubleshooting & Replacement Checklist

Confirm failure
Check loss of circuit function
Verify with multimeter continuity test (do not rely on visual inspection alone)
Check for root cause
Look for parasitic draw conditions (unexpected current drain)
Inspect wiring for shorts or overload sources
Verify fuse holder contact integrity (loose, corroded, or heat-damaged terminals)
Replace correctly
Match exact amperage rating
Match physical size and type
Match response type (fast vs time-delay)

If a replacement fuse blows immediately, the fault is still present and must be resolved before re-energizing the circuit.

About Fuses

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