The MF-RX Series is currently
available, although not recommended
for new designs. The higher voltage
rated MF-RX/72 Series is preferred.
Features
■ Radial Leaded Devices
■ Cured, flame retardant epoxy polymer
insulating material meets UL 94V-0
requirements
R
X
110
0180T
■ Agency recognition:
■ RoHS compliant*
MF-RX Series - PTC Resettable Fuses
Electrical Characteristics
1 Hour (R )
1
Tripped
Power
Dissipation
Initial
Resistance
Max. Time
to Trip
I
I
Post-Trip
hold
trip
Resistance
V max.
Volts
I max.
Amps
Model
Amperes
at 23 °C
Ohms
at 23 °C
Ohms
at 23 °C
Amperes Seconds
Watts
at 23 °C
at 23 °C
at 23 °C
Hoꢂd
Trip
Min.
Max.
Max.
Tꢁp.
MF-RX110
MF-RX135
MF-RX160
MF-RX185
MF-RX250
MF-RX300
MF-RX375
60
60
60
60
60
60
60
40
40
40
40
40
40
40
1.10
1.35
1.60
1.85
2.50
3.00
3.75
2.20
2.70
3.20
3.70
5.00
6.00
7.50
0.15
0.12
0.09
0.08
0.05
0.04
0.03
0.25
0.19
0.14
0.12
0.08
0.06
0.05
0.38
0.30
0.22
0.19
0.13
0.10
0.08
5.5
6.75
8.0
9.25
12.5
15.0
18.75
8.2
9.6
1.50
1.70
1.90
2.10
2.50
2.80
3.20
11.4
12.6
15.6
19.8
24.0
Environmental Characteristics
Operating/Storage Temperature...................... -40 °C to +85 °C
Maximum Device Surface Temperature
in Tripped State............................................ 125 °C
Passive Aging.................................................. +85 °C, 1000 hours.......................................... 5 ꢀ tꢁpicaꢂ resistance change
Humiditꢁ Aging................................................ +85 °C, 85 ꢀ R.H. 1000 hours........................ 5 ꢀ tꢁpicaꢂ resistance change
Thermaꢂ Shock ................................................ -40 °C to +85 °C, 10 times .............................. 10 ꢀ tꢁpicaꢂ resistance change
Soꢂvent Resistance.......................................... MIL-STD-202, Method 215.............................. No change
Vibration .......................................................... MIL-STD-883C, Method 2007.1,..................... No change
Condition A
Test Procedures And Requirements For Model MF-RX Series
Test
Test Conditions
Accept/Reject Criteria
Visuaꢂ/Mech..................................................... Verifꢁ dimensions and materiaꢂs...................... Per MF phꢁsicaꢂ description
Resistance....................................................... In stiꢂꢂ air @ 23 °C............................................. Rmin ≤ R ≤ Rmax
Time to Trip...................................................... 5 times Ihoꢂd, Vmax, 23 °C.............................. T ≤ max. time to trip (seconds)
Hoꢂd Current.................................................... 30 min. at Ihoꢂd................................................ No trip
Trip Cꢁcꢂe Life.................................................. Vmax, Imax, 100 cꢁcꢂes................................... No arcing or burning
Trip Endurance ................................................ Vmax, 48 hours................................................ No arcing or burning
UL Fiꢂe Number ............................................... E 174545S
CSA Fiꢂe Number............................................. CA 110338
TÜV Fiꢂe Number ............................................. R2057213
Thermal Derating Chart - I
/ I
(Amps)
hold trip
Ambient Operating Temperature
23 ºC 40 ºC 50 ºC
Model
-40 ºC
-20 ºC
0 ºC
60 ºC
70 ºC
85 ºC
MF-RX110
MF-RX135
MF-RX160
MF-RX185
MF-RX250
MF-RX300
MF-RX375
1.71 / 3.42 1.50 / 3.00 1.31 / 2.62 1.10 / 2.20 0.89 / 1.78 0.79 / 1.58 0.69 / 1.38 0.59 / 1.18 0.44 / 0.88
2.09 / 4.18 1.84 / 3.68 1.61 / 3.22 1.35 / 2.70 1.09 / 2.18 0.97 / 1.94 0.85 / 1.70 0.73 / 1.46 0.54 / 1.08
2.48 / 4.96 2.18 / 4.36 1.90 / 3.80 1.60 / 3.20 1.30 / 2.60 1.15 / 2.30 1.01 / 2.02 0.86 / 1.72 0.64 / 1.28
2.87 / 5.74 2.52 / 5.04 2.20 / 4.40 1.85 / 3.70 1.50 / 3.00 1.33 / 2.66 1.17 / 2.34 1.00 / 2.00 0.74 / 1.48
3.88 / 7.76 3.40 / 6.80 2.98 / 5.96 2.50 / 5.00 2.03 / 4.06 1.80 / 3.60 1.58 / 3.16 1.35 / 2.70 1.00 / 2.00
4.65 / 9.30 4.08 / 8.16 3.57 / 7.14 3.00 / 6.00 2.43 / 4.86 2.16 / 4.32 1.89 / 3.78 1.62 / 3.24 1.20 / 2.40
5.81 / 11.6 5.10 / 10.2 4.46 / 8.92 3.75 / 7.50 3.04 / 6.08 2.70 / 5.40 2.36 / 4.72 2.03 / 4.06 1.50 / 3.00
*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.