R
o
H
SP
b
¨
¨
U
L
Telecom Design Guide • © 2005 Littelfuse 4 - 9 www.littelfuse.com
Electronic Fuses
229P / 230P Series 2AG Slo-Blo® Fuse
The 2AG Slo-Blo fuses are available in cartridge
form or with axial leads (board washable). The
“P” suffix indicates that it is a lead-free, RoHS-
compliant device. These fuses provide the same
performance characteristics as the 3AG
counterpart while occupying one-third the space.
The fuses combine conventional overcurrent
protection with the ability to withstand high-current,
short-duration pulses. They meet demanding
telecom requirements and comply with the short
circuit requirements of UL 1459. An insulating
sleeve option is available.
For environmental and physical specifications and
soldering parameters, see www.littelfuse.com.
The 2AG Indicating Slo-Blo fuse instantly identifies
itself upon opening by showing a discoloration of its
glass body, eliminating guesswork and time-
consuming circuit testing.
Note: Short circuit capabilities for 60 A, 40 A, 7 A, and 2.2 A are 600 V AC.
Electrical Characteristics
% of Ampere Rating
Opening Time
MIN MAX
110 4 hours —
135 —1 hour
200 3 s 20 s
Interrupting Values
Current Rating
Amps
Interrupting Values
Vac
0.25–3.5 10,000 A at 125
4–7 400 A at 125
0.25–1 35 A at 250
1.25–3.5 100 A at 250
#TDG_4_ElectronicFuse.fm Page 9 Sunday, July 31, 2005 8:33 AM
www.littelfuse.com 4 - 10 © 2005 Littelfuse • Telecom Design Guide
229P / 230P Series 2AG Slo-Blo® Fuse
Notes:
• Fuses withstand 50 repetitions of a double exponential impulse wave at listed currents and voltages, except that the 229 1.25 /
230 1.25 fuse withstands 20 repetitions at 2x10 µs @ 2500 V.
• To order an indicating 2AG Slo-Blo fuse, add an ‘S’ at the end of the part number (for example, 230 001S).
• To order fuses to DSCC Drawing #87108, change 229 to 290 and 230 to 291.
Surge Ratings
Cartridge Part
Number
Axial Lead Part
Number
IPP
2x10 µs @ 2500 V
Amps
IPP
10x160 µs @ 1500 V
Amps
IPP
10x560 µs @ 800 V
Amps
IPP
10x1000 µs @ 1000 V
Amps
0229.250P 0230.250P not rated 23 16.6 12.4
0229.350P 0230.350P not rated 34 25.8 19.3
0229.375P 0230.375P not rated 40 25.4 19
0229.500P 0230.500P not rated 60 37.7 28.2
0229.600P 0230.600P not rated 71 47.2 35.3
0229.750P 0230.750P not rated 91 65.5 49
0229.800P 0230.800P not rated 104 68.9 51.6
0229 001.P 0230 001.P not rated 130 88.6 66.3
0229 1.25P 0230 1.25P 500 162 118.1 100
Electrical Parameters
Cartridge Part Number
Axial Lead Part
Number Voltage Rating
Current Rating
Amps
I2t Measured at DC
Rated Voltage
Typical DC Cold
Resistance
Ohms
0229.250P 0230.250P 250 0.25 0.216 2.41
0229.350P 0230.350P 250 0.35 0.49 1.3
0229.375P 0230.375P 250 0.375 0.58 1.17
0229.500P 0230.500P 250 0.5 1.16 0.688
0229.600P 0230.600P 250 0.6 1.75 0.477
0229.750P 0230.750P 250 0.75 2.95 0.340
0229.800P 0230.800P 250 0.8 3.45 0.304
0229 001.P 0230 001.P 250 15.64 0.212
0229 1.25P 0230 1.25P 250 1.25 9.8 0.145
#TDG_4_ElectronicFuse.fm Page 10 Sunday, July 31, 2005 8:33 AM
229P / 230P Series 2AG Slo-Blo® Fuse
Telecom Design Guide • © 2005 Littelfuse 4 - 11 www.littelfuse.com
Electronic Fuses
Time Current Curve
1000
100
10
1
0.1
0.01
0.1 1 10 100 100
0
0.25 A
0.375 A
0.5 A
0.75 A
1 A
1.5 A
Time in Seconds
Current in Amperes
#TDG_4_ElectronicFuse.fm Page 11 Sunday, July 31, 2005 8:33 AM
