MF-RX/72 Series - PTC Resettable Fuses
RX110
4180S
Electrical Characteristics
Features
■72 V rated
■Radial leaded devices
■Cured, flame retardant epoxy polymer
insulating material meets
UL 94V-0 requirements
■RoHS compliant*
■Agency recognition:
Applications
Almost anywhere there is a low voltage
power supply, up to 72 V and a load to be
protected, including:
■Security and fire alarm systems
■Loudspeakers
■Power transformers
1 Hour (R1)Max. Time Tripped
Ihold Itrip Initial Post-Trip To Trip Power
Resistance Resistance Dissipation
Model Amperes Ohms Ohms Amperes Seconds Watts
V max. I max.
at 23 °C at 23 °C at 23 °C at 23 °C at 23 °C at 23 °C
Volts Amps
Hold Trip Min. Max. Max. Typ.
MF-RX110/72 72.0 40 1.10 2.20 0.15 0.25 0.38 5.5 8.2 1.50
MF-RX135/72 72.0 40 1.35 2.70 0.12 0.19 0.30 6.75 9.6 1.70
MF-RX160/72 72.0 40 1.60 3.20 0.09 0.14 0.22 8.0 11.4 1.90
MF-RX185/72 72.0 40 1.85 3.70 0.08 0.12 0.19 9.25 12.6 2.10
MF-RX250/72 72.0 40 2.50 5.00 0.05 0.08 0.13 12.5 15.6 2.50
MF-RX300/72 72.0 40 3.00 6.00 0.04 0.06 0.10 15.0 19.8 2.80
MF-RX375/72 72.0 40 3.75 7.50 0.03 0.05 0.08 18.75 24.0 3.20
Operating/Storage Temperature ........................-40 °C to +85 °C
Maximum Device Surface Temperature
in Tripped State ................................................125 °C
Passive Aging......................................................+85 °C, 1000 hours ....................................±5 % typical resistance change
Humidity Aging....................................................+85 °C, 85 % R.H. 1000 hours ..................±5 % typical resistance change
Thermal Shock....................................................+85 °C to -55 °C, 10 times ........................±10 % typical resistance change
Solvent Resistance ............................................MIL-STD-202, Method 215 ........................No change
Vibration ..............................................................MIL-STD-883C, Method 2007.1, ................No change
Condition A
Environmental Characteristics
Test Test Conditions Accept/Reject Criteria
Visual/Mech. ......................................................Verify dimensions and materials ................Per MF physical description
Resistance ..........................................................In still air @ 23 °C........................................Rmin ≤R ≤Rmax
Time to Trip ........................................................5 times Ihold, Vmax, 23 °C ........................T ≤max. time to trip (seconds)
Hold Current ......................................................30 min. at Ihold ..........................................No trip
Trip Cycle Life ....................................................Vmax, Imax, 100 cycles ..............................No arcing or burning
Trip Endurance....................................................Vmax, 48 hours ..........................................No arcing or burning
UL File Number ..................................................E 174545S
Test Procedures And Requirements For Model MF-RX/72 Series
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Circuit Protection Division
Asia-Pacific: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
Europe: Tel: +41-41 768 5555 • Fax: +41-41 768 5510
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
*RoHS COMPLIANT
MF-RX/72 Series - PTC Resettable Fuses
Additional Features
■Resettable circuit protection
■Bulk packaging, tape and reel and Ammo-Pak available on most models
Product Dimensions
Packaging options:
BULK: 500 pcs. per bag.
TAPE & REEL: MF-RX110/72 - MF-RX160/72 = 1500 pcs. per reel; MF-RX185/72 - MF-RX375/72 = 1000 pcs. per reel.
AMMO-PACK: MF-RX110/72 - MF-RX160/72 = 1000 pcs. per reel; MF-RX185/72 - MF-RX375/72 = 500 pcs. per reel.
A B C D E Physical Characteristics
Model Max. Max. Nom. Tol. ± Min. Max. Lead Dia. Material
MF-RX110/72 10.84 16.8 5.1 0.7 7.6 3.1 0.81 Sn/Cu
(0.427) (0.663) (0.201) (0.028) (0.299) (0.122) (0.032)
MF-RX135/72 12.26 18.3 5.1 0.7 7.6 3.1 0.81 Sn/Cu
(0.483) (0.720) (0.201) (0.028) (0.299) (0.122) (0.032)
MF-RX160/72 13.94 19.9 5.1 0.7 7.6 3.1 0.81 Sn/Cu
(0.549) (0.785) (0.201) (0.028) (0.299) (0.122) (0.032)
MF-RX185/72 15.18 21.2 5.1 0.7 7.6 3.1 0.81 Sn/Cu
(0.598) (0.834) (0.201) (0.028) (0.299) (0.122) (0.032)
MF-RX250/72 17.84 23.8 10.2 0.7 7.6 3.1 0.81 Sn/Cu
(0.702) (0.939) (0.402) (0.028) (0.299) (0.122) (0.032)
MF-RX300/72 20.67 26.7 10.2 0.7 7.6 3.1 0.81 Sn/Cu
(0.814) (1.050) (0.402) (0.028) (0.299) (0.122) (0.032)
MF-RX375/72 23.51 29.6 10.2 0.7 7.6 3.1 0.81 Sn/Cu
(0.926) (1.162) (0.402) (0.028) (0.299) (0.122) (0.032)
MM
(INCHES)
DIMENSIONS =
0.81 (20AWG)
AE
B
D
C
How to Order
MF - RX 110/72 - __
Multifuse®
Product Designator
Series
RX =Radial Leaded Component
Hold Current, Ihold
110-375 (1.10 Amps - 3.75 Amps)
Maximum Voltage, Vmax
72 (72 Volts)
Packaging Options
- = Bulk Packaging
- 2 = Tape and Reel*
- AP = Ammo-Pak*
*Packaged per EIA 486-B
Typical Part Marking
Represents total content. Layout may vary.
RX110
4180S
MANUFACTURER'S
TRADEMARK
PART
IDENTIFICATION LOT NO.
(S = CHINA)
DATE CODE
(FIRST DIGIT =
LAST DIGIT OF YEAR;
NEXT THREE DIGITS =
DAY OF YEAR)
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
MF-RX/72 SERIES, REV. B, 11/04
MF-RX/72 Series - PTC Resettable Fuses
Typical Time to Trip at 23 °C
0.01
0.001 1 10 100
0.1
1
10
100
1000
Fault Current (Amps)
Time to Trip (Seconds)
MF-RX110/72
MF-RX135/72
MF-RX160/72
MF-RX185/72
MF-RX250/72
MF-RX300/72
MF-RX375/72
The Time to Trip curves represent typical performance of a device in a simulated application environment. Actual performance in specific customer
applications may differ from these values due to the influence of other variables.
Thermal Derating Chart - Ihold (Amps)
Ambient Operating Temperature
Model -40 °C -20 °C0
°C 23 °C 40 °C 50 °C 60 °C 70 °C 85 °C
MF-RX110/72 1.71 1.50 1.31 1.10 0.89 0.79 0.69 0.59 0.44
MF-RX135/72 2.09 1.84 1.61 1.35 1.09 0.97 0.85 0.73 0.54
MF-RX160/72 2.48 2.18 1.90 1.60 1.30 1.15 1.01 0.86 0.64
MF-RX185/72 2.87 2.52 2.20 1.85 1.50 1.33 1.17 1.00 0.74
MF-RX250/72 3.88 3.40 2.98 2.50 2.03 1.80 1.58 1.35 1.00
MF-RX300/72 4.65 4.08 3.57 3.00 2.43 2.16 1.89 1.62 1.20
MF-RX375/72 5.81 5.10 4.46 3.75 3.04 2.70 2.36 2.03 1.50
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Devices taped using EIA468–B/IEC286-2 standards. See table below and Figures 1 and 2 for details.
IEC EIA Dimensions
Dimension Description Mark Mark Dimensions Tolerance
Carrier tape width
WW
Hold down tape width:
W0W4
min.
Hold down tape No protrusion
Top distance between tape edges
W2W6
max.
Sprocket hole position
W1W5
Sprocket hole diameter
D0D0
Abscissa to plane (straight lead)
HH
Abscissa to plane (kinked lead)
H0H0
Abscissa to top (straight lead)
H1H1
max.
Abscissa to top (kinked lead)
H1H1
max.
Overall width w/lead protrusion (straight lead)
C1
max.
Overall width w/lead protrusion (kinked lead)
C1
max.
Overall width w/o lead protrusion (straight lead)
C2
max.
Overall width w/o lead protrusion (kinked lead)
C2
max.
Lead protrusion
I1L1
max.
Protrusion of cutout
LL
max.
Protrusion beyond hold tape
I2I2
Not specified
Sprocket hole pitch
P0P0
Pitch tolerance 20 consecutive ±1
Device pitch: MF-R005–MF-R160, MF-R/90, MF-RX/72
Device pitch: MF-R185–MF-R400,
MF-RX110–MF-RX375, MF-R/600
Tape thickness
tt
max.
Tape thickness with splice: MF-R010–MF-R160
t1
max.
Tape thickness with splice: MF-R250–MF-R1100
MF-RX110–MF-RX375, MF-R/90
t1
max.
Splice sprocket hole alignment 0
Body lateral deviation ∆
h
∆
h
0
Body tape plane deviation ∆
p
∆
p
0
Lead spacing
FF
Reel width
wW
2
max.
Reel diameter
da
max.
Space between flanges less device
W1h
MF-R, MF-R/90, MF-R/600, MF-RX, MF-RX/72 & MF-RX/250 Series
Tape and Reel Specifications
18
(.709)
-0.5/+1.0
(-0.02/+.039)
9
(.354)
-0.5/+0.75
(-0.02/+0.03)
4
(.157)
±0.2
(±.0078)
18.5
(.728)
±3.0
(±.118)
16
(.63)
32.2
(1.268)
38.0
(1.496)
43.2
(1.7)
55.0
(2.165)
42.5
(1.673)
54.0
(2.126)
1.0
(.039)
11
(.433)
±0.5
(±.02)
12.7
(0.5)
12.7
(0.5)
25.4
(1.0)
0.9
(.035)
1.5
(.059)
2.3
(.091)
5.08
(0.2)
56
(2.205)
370
(14.57)
±0.3
(±.012)
±0.3
(±.012)
±1.0
(±.039)
±0.3
(±.021)
±0.2
(±.008)
4.75
(.187)
±3.25
(±.128)
11
(.433)
3
(.118)
DIMENSIONS = MM
(INCHES)
IEC EIA Dimensions
Dimension Description Mark Mark Dimensions Tolerance
Arbor hole diameter
fc
Core diameter: MF-R, MF-RX, MF-R/90
hn
max.
Core diameter: MF-RX/250, MF-R/600
hn
max.
Box: MF-R, MF-RX, MF-R/90 max.
Box: MF-RX/250 max.
Box: MF-R/600 max.
Consecutive missing places: MF-R, MF-RX, MF-R/90 3 max.
Consecutive missing places: MF-RX/250, MF-R/600 none
Empty places per reel: MF-R, MF-RX, MF-R/90 Not specified
Empty places per reel: MF-RX/250, MF-R/600 0.1 %
MF-R, MF-R/90, MF-R/600, MF-RX, MF-RX/72 & MF-RX/250 Series
Tape and Reel Specifications
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
t
User direction of feed
Cross section A - B
∆p∆p
H
H1
Reference plane
W0
H0W1
W
AB
F
D0
P0
I1
I2
L
H1
P1
∆h
∆h
h
w
h
f
d
Reel
Upper side
Tape
Lower side
User
direction
of
feed
Reel Dimensions - Figure 2
Taped Component Dimensions - Figure 1
26
(1.024)
80
(3.15)
56
(2.2)
372
(14.6)
372
(14.6)
±12.0
(±.472)
DIMENSIONS = MM
(INCHES)
91
(3.58)
67
(2.64)
372
(14.6)
362
(14.25)
64
(2.52)
372
(14.6)
362
(14.25)
