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 % typical resistance change

Humidity Aging................................................. +85 °C, 85 % R.H. 1000 hours .........................±5 % typical resistance change

Thermal Shock ................................................ -40 °C to +85 °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

Test Procedures And Requirements For Model MF-RX Series

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

CSA File Number............................................. CA 110338

TÜV File Number............................................. R2057213

Electrical Characteristics

Model

V max.

Volts

I max.

Amps

Ihold

Itrip

Initial

Resistance

1 Hour (R1)

Post-Trip

Resistance

Max. Time

to Trip

Tripped

Power

Dissipation

Amperes

at 23 °C

Ohms

at 23 °C

Ohms

at 23 °C

Amperes

at 23 °C

Seconds

at 23 °C

Watts

at 23 °C

Hold

Trip

Min.

Max.

Max.

Typ.

MF-RX110

60

40

1.10

2.20

0.15

0.25

0.38

5.5

8.2

1.50

MF-RX135

60

40

1.35

2.70

0.12

0.19

0.30

6.75

9.6

1.70

MF-RX160

60

40

1.60

3.20

0.09

0.14

0.22

8.0

11.4

1.90

MF-RX185

60

40

1.85

3.70

0.08

0.12

0.19

9.25

12.6

2.10

MF-RX250

60

40

2.50

5.00

0.05

0.08

0.13

12.5

15.6

2.50

MF-RX300

60

40

3.00

6.00

0.04

0.06

0.10

15.0

19.8

2.80

MF-RX375

60

40

3.75

7.50

0.03

0.05

0.08

18.75

24.0

3.20

Features

insulating material meets UL 94V-0

requirements

MF-RX Series - PTC Resettable Fuses

X110

0180T

R

The MF-RX Series is currently

available, although not recommended

for new designs. The higher voltage

rated MF-RX/72 Series is preferred.

Thermal Derating Chart - Ihold / Itrip (Amps)

Model

Ambient Operating Temperature

-40 ºC

-20 ºC

0 ºC

23 ºC

40 ºC

50 ºC

60 ºC

70 ºC

85 ºC

MF-RX110

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

MF-RX135

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

MF-RX160

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

MF-RX185

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

MF-RX250

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

MF-RX300

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

MF-RX375

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 and RoHS Recast 2011/65/EU June 8, 2011.

Specifications are subject to change without notice.

The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.

Users should verify actual device performance in their specific applications.