Features
I
RX
1
018 10
0T
Applications
Almost anywhere there is a low voltage
power supply, up to 60V and a load to be
protected, including:
I
Security and fire alarm systems
I
Loud speakers
I
Power transformers
I
I
Radial Leaded Devices
Cured, flame retardant epoxy polymer
insulating material meets
UL 94V-0 requirements
Bulk packaging, tape and reel and Ammo-
Pak available on most models
Agency recognition:
I
MF-RX Series -
PTC Resettable Fuses
Electrical Characteristics
Initial
Resistance
Ohms
at 23°C
Min.
Max.
1 Hour (R1)
Post-Trip
Resistance
Ihold
Model
V max.
Volts
I max.
Amps
Itrip
Max. Time
To Trip
Amperes
at 23°C
Seconds
at 23°C
Tripped
Power
Dissipation
Amperes
at 23°C
Hold
Trip
Ohms
at 23°C
Max.
Watts
at 23°C
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
11.4
12.6
15.6
19.8
24.0
1.50
1.70
1.90
2.10
2.50
2.80
3.20
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 ....................................................+125°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
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
Thermal Derating Chart - Ihold / Itrip (Amps)
Ambient Operating Temperature
Model
MF-RX110
MF-RX135
MF-RX160
MF-RX185
MF-RX250
MF-RX300
MF-RX375
-40˚C
1.71 / 3.42
2.09 / 4.18
2.48 / 4.96
2.87 / 5.74
3.88 / 7.76
4.65 / 9.30
5.81 / 11.6
-20˚C
1.50 / 3.00
1.84 / 3.68
2.18 / 4.36
2.52 / 5.04
3.40 / 6.80
4.08 / 8.16
5.10 / 10.2
0˚C
1.31 / 2.62
1.61 / 3.22
1.90 / 3.80
2.20 / 4.40
2.98 / 5.96
3.57 / 7.14
4.46 / 8.92
23˚C
1.10 / 2.20
1.35 / 2.70
1.60 / 3.20
1.85 / 3.70
2.50 / 5.00
3.00 / 6.00
3.75 / 7.50
40˚C
0.89 / 1.78
1.09 / 2.18
1.30 / 2.60
1.50 / 3.00
2.03 / 4.06
2.43 / 4.86
3.04 / 6.08
50˚C
0.79 / 1.58
0.97 / 1.94
1.15 / 2.30
1.33 / 2.66
1.80 / 3.60
2.16 / 4.32
2.70 / 5.40
60˚C
0.69 / 1.38
0.85 / 1.70
1.01 / 2.02
1.17 / 2.34
1.58 / 3.16
1.89 / 3.78
2.36 / 4.72
70˚C
0.59 / 1.18
0.73 / 1.46
0.86 / 1.72
1.00 / 2.00
1.35 / 2.70
1.62 / 3.24
2.03 / 4.06
85˚C
0.44 / 0.88
0.54 / 1.08
0.64 / 1.28
0.74 / 1.48
1.00 / 2.00
1.20 / 2.40
1.50 / 3.00
Specifications are subject to change without notice.
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
