LITTELFUSE 27901.5, 279005, 279004, 279003, 279002 Datasheet

Axial Lead and Cartridge Fuses

Subminiature

MICRO™ FUSE Very Fast-Acting Type 272/273/274/278/279 Series

® ® QPL

Developed originally for the U.S. Space Program, MICRO fuse provides reliability in a compact design. The MICRO fuse is available in plug in or radial lead styles and a complete range of ampere ratings from 1/500 to 5 amperes to suit a wide variety of design needs.

ELECTRICAL CHARACTERISTICS:

	% of Ampere	Ampere	Opening
	Rating	Rating	Time
	100%	1/500 –5	4 hours, Minimum
	200%	1/500 –3/10	5 seconds, Maximum
		4/10 –5	2 seconds, Maximum

AGENCY APPROVALS: Recognized under the Components Program of Underwriters Laboratories and Certified by CSA.

AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.

INTERRUPTING RATING: 10,000 amperes at 125 VAC/VDC.

FUSES TO MIL SPEC: 273 Series is available in Military QPL type (FM02). To order, change 273 to 274.

Operating Temperature:

273 and 279: –55°C to 85°C. 272 and 278: –55°C to 125°C

PATENTED

ORDERING INFORMATION:

Plug-In		Radial Lead				Nominal	Nominal
Catalog	Catalog	Catalog	Catalog	Ampere	Voltage	Resistance	Melting I2t
Number	Number	Number	Number	Rating	Rating	Cold Ohms	A2 Sec.
272.002	273.002	278.002	279.002	1/500	125	2200	0.00000000845
272.005	273.005	278.005	279.005	1/200	125	280 0.	0.0000000810
272.010	273.010	278.010	279.010	1/100	125	80.0	0.000000462
272.015	273.015	278.015	279.015	1/64	125	44.0	0.00000123
272.031	273.031	278.031	279.031	1/32	125	16.0	0.00000810
272.050	273.050	278.050	279.050	1/20	125	3.20	0.0000666
272.062	273.062	278.062	279.062	1/16	125	2.32	0.000115
272.100	273.100	278.100	279.100	1/10	125	1.25	0.000385
272.125	273.125	278.125	279.125	1/8	125	1.0	0.000691
272.200	273.200	278.200	279.200	2/10	125	2.30	0.00409
272.250	273.250	278.250	279.250	1/4	125	1.75	0.00640
272.300	273.300	278.300	279.300	3/10	125	1.25	0.00945
272.400	273.400	278.400	279.400	4/10	125	0.227	0.0251
272.500	273.500	278.500	279.500	1/2	125	0.167	0.0716
272.600	273.600	278.600	279.600	6/10	125	0.430	0.0411
272.700	273.700	278.700	279.700	7/10	125	0.324	0.0710
272.750	273.750	278.750	279.750	3/4	125	0.293	0.0900
272.800	273.800	278.800	279.800	8/10	125	0.271	0.113
272 001	273 001	278 001	279 001	1	125	0.0880	0.0648
272 01.5	273 01.5	278 01.5	279 01.5	11/2	125	0.0578	0.160
272 002	273 002	278 002	279 002	2	125	0.0425	0.300
272 003	273 003	278 003	279 003	3	125	0.0275	0.759
272 004	273 004	278 004	279 004	4	125	0.0202	1.38
272 005	273 005	278 005	279 005	5	125	0.0156	2.21

272 000 Series			273 000 Series
5.97	7.30	4.32	6.35	8.89	4.32
(.235")	(.29")		(.25")	(.35")
		(.17")			(.17")
		2.54 (.10")			2.54 (.10")

278 000 Series

5.977.30

(.235")	(.29")	25.4 (1.0")
		2.54 (.10")

279 000 Series

	6.35	8.89
	(.25")		25.4 (1.0")
		(.35")

2.54 (.10")

NOTE: Amperage and voltage rating stamped on cap. Leads are solder-coated copper; .025" diameter.

Average Time Current Curves

	1/200 A	1/100 A 1/64 A	1/32 A	1/16 A	1/8 A	1/4 A	1/2 A 3/4 A	1 A	1 1/2 A	2 A	3 A	4 A	5 A
100
	10
TIME IN SECONDS	1
0.1
0.01
0.001							1						10	100
0.005		0.01		0.1

CURRENT IN AMPERES

286

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