Features
Applications
■ 72 V rated
Almost anywhere there is a low voltage power
supply, up to 72 V and a load to be protected,
including:
■ Radial leaded devices
R
X
1
0
10
S
■ Cured, flame retardant epoxy polymer
insulating material meets UL 94 V-0
requirements
4
18
■ Security and fire alarm systems
■ Loudspeakers
■ RoHS compliant* and halogen free**
■ Agency recognition:
■ Power transformers
MF-RX/72 Series - PTC Resettable Fuses
Electrical Characteristics
1 Hour (R )
1
Tripped
Power
Initial
Max. Time
To Trip
I
I
Post-Trip
hold
trip
Resistance
Resistance
Dissipation
V max.
I max.
Amps
Model
Volts
Amperes
at 23 °C
Ohms
Ohms
Amperes Seconds
Watts
at 23 °C
at 23 °C
at 23 °C
at 23 °C
at 23 °C
Hold
Trip
0.40
0.50
0.60
0.80
1.00
1.30
1.50
1.80
2.20
2.70
3.20
3.70
5.00
6.00
7.50
Min.
Max.
2.84
1.95
1.36
0.86
0.77
0.48
0.40
0.31
0.25
0.19
0.14
0.12
0.08
0.06
0.05
Max.
4.40
3.00
2.10
1.29
1.17
0.72
0.60
0.47
0.38
0.30
0.22
0.19
0.13
0.10
0.08
Typ.
0.40
0.45
0.50
0.55
0.75
0.90
0.90
1.00
1.50
1.70
1.90
2.10
2.50
2.80
3.20
MF-RX020/72
MF-RX025/72
MF-RX030/72
MF-RX040/72
MF-RX050/72
MF-RX065/72
MF-RX075/72
MF-RX090/72
MF-RX110/72
MF-RX135/72
MF-RX160/72
MF-RX185/72
MF-RX250/72
MF-RX300/72
MF-RX375/72
72
72
72
72
72
72
72
72
72
72
72
72
72
72
72
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
1.10
1.35
1.60
1.85
2.50
3.00
3.75
1.50
1.00
0.76
0.52
0.41
0.27
0.18
0.14
0.15
0.12
0.09
0.08
0.05
0.04
0.03
1.0
1.25
1.5
2.2
2.5
3.0
2.0
3.9
2.5
4.0
3.25
3.75
4.5
5.3
6.3
7.2
5.5
8.2
6.75
8.0
9.6
11.4
12.6
15.6
19.8
24.0
9.25
12.5
15.0
18.75
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 ..................................................... +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
Test Procedures And Requirements For Model MF-RX/72 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 .................................................... E174545
http://www.ul.com/ Follow link to Certifications, then UL File No., enter E174545
TÜV Certificate Number ....................................... R 02057213
http://www.tuvdotcom.com/ Follow link to “other certificates”, enter File No. 2057213
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
** Bourns follows the prevailing definition of “halogen free” in the industry. Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less;
(b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less.
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.
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