Features Applications
n Radial leaded devices n Food blenders, coffee machines
n Cured, flame retardant epoxy polymer n HVAC
insulating material meets UL 94V-0
n Electric fans, blowers
requirements
n AC adaptors
n Bulk packaging, tape and reel available
n Resettable circuit protection
n Agency recognition:
n RoHS compliant* and halogen free**
MF-RM Series - PTC Resettable Fuses
Electrical Characteristics
One Hour Tripped
Typical Current Initial Max.
V I Post-Trip Power
max max
Trip Limit Resistance Time to Trip
Resistance Dissipation
Model
I I Operating Interrupt Interrupt R R Max. PD Typ.
hold trip Min. 1
at 23 C
at 23 C at 23 C Voltage Voltage Current at 23 C at 23 C at 23 C
(A) (A) (Vac) (Vac) (A) (Ohms) (Ohms) (A) (Sec.) (W)
MF-RM005/240 0.05 0.12 240 265 1.0 18.50 65.00 0.25 10.0 0.9
MF-RM008/240 0.08 0.19 240 265 1.2 7.40 26.00 0.40 10.0 0.9
MF-RM012/240 0.12 0.30 240 265 1.2 3.00 12.00 0.60 15.0 1.0
MF-RM016/240 0.16 0.37 240 265 2.0 2.50 7.80 0.80 15.0 1.4
MF-RM025/240 0.25 0.56 240 265 3.5 1.30 3.80 1.25 18.5 1.5
MF-RM033/240 0.33 0.74 240 265 4.5 0.77 2.60 1.65 21.0 1.7
MF-RM040/240 0.40 0.90 240 265 5.5 0.60 1.90 2.00 24.0 2.0
MF-RM055/240 0.55 1.25 240 265 7.0 0.45 1.45 2.75 26.0 3.4
Environmental Characteristics
Operating Temperature .................................... -20 C to +85 C
Humidity Aging................................................. +85 C, 85 % R.H. 1000 hours .........................20 % typical resistance change
Passive Aging .................................................. +85 C, 1000 hours ...........................................20 % typical resistance change
Vibration .......................................................... MIL-STD-883C, Method 2007.1,.......................No change
Condition A
Solvent Resistance .......................................... MIL-STD-202, Method 215 ...............................No change
Test Procedures And Requirements For Model MF-RM Series
Item Test Conditions Accept/Reject Criteria
Visual/Mechanical ............................................ Verify dimensions and material .........................Per MF physical description
Resistance ....................................................... In still air @ 23 C .............................................R R R1
min max
Time to Trip ...................................................... 240 Vac, specified current ................................T max. time to trip
Hold Current .................................................... At Ihold ..............................................................No trip
Trip Cycle Life .................................................. 240 Vac, I , 100 cycles ................................No arcing or burning
max
Trip Endurance ................................................ a) 240 Vac, I , 24 hours ..............................No arcing or burning
max
b) 265 Vac, I , 30 mins.
max
Solderability ..................................................... MIL-STD-202, Method 208 ...............................95 % min. coverage
UL File Number .....................E174545 ........... Advantages Benefits
n Resettable feature with overtemperature and overcurrent protection n Reduced repair and replacement costs
can save expensive components from having to be replaced after
n Reduced nuisance tripping
tripping, e.g., transformers with built in thermal fuses
n Combined overcurrent and overtemperature protector in one device
n Faster than bimetallic switch designs that take on average
approximately 30 seconds to cool down and reset
n Generally lower electromagnetic interference than bimetallic switches
MF-RMMF-RX SeriesSeries -- PTCPTC ResettableResettable FusesFuses
Thermal Derating Chart - I (Amps)
hold
Ambient Operating Temperature
Model
-20 C 0 C 23 C 40 C 50 C 60 C 70 C 85 C
MF-RM005/240 0.08 0.06 0.05 0.04 0.04 0.03 0.03 0.02
MF-RM008/240 0.12 0.10 0.08 0.07 0.06 0.05 0.04 0.03
MF-RM012/240 0.18 0.15 0.12 0.10 0.09 0.07 0.06 0.04
MF-RM016/240 0.24 0.20 0.16 0.13 0.11 0.10 0.08 0.05
MF-RM025/240 0.38 0.32 0.25 0.21 0.18 0.15 0.13 0.09
MF-RM033/240 0.50 0.42 0.33 0.27 0.23 0.20 0.17 0.11
MF-RM040/240 0.61 0.51 0.40 0.33 0.28 0.24 0.20 0.14
MF-RM055/240 0.80 0.68 0.55 0.46 0.40 0.35 0.29 0.22
Product Dimensions
C Physical Characteristics
A B D E
Model
Max. Max. Nom. Tol. Min. Max. Style Lead Dia. Material
8.3 12.9 5.1 0.7 7.6 3.8 0.51
MF-RM005/240 1 Sn/Cu
(0.327) (0.508) (0.201) (0.028) (0.299) (0.150) (0.020)
8.3 12.9 5.1 0.7 7.6 3.8 0.51
MF-RM008/240 1 Sn/Cu
(0.327) (0.508) (0.201) (0.028) (0.299) (0.150) (0.020)
8.3 12.9 5.1 0.7 7.6 3.8 0.51
MF-RM012/240 1 Sn/Cu
(0.327) (0.508) (0.201) (0.028) (0.299) (0.150) (0.020)
9.9 13.8 5.1 0.7 7.6 3.8 0.51
MF-RM016/240 1 Sn/Cu
(0.390) (0.543) (0.201) (0.028) (0.299) (0.150) (0.020)
10.0 20.0 5.1 0.7 7.6 3.8 0.65
MF-RM025/240 2 Sn/Cu
(0.394) (0.787) (0.201) (0.028) (0.299) (0.150) (0.026)
11.4 20.0 5.1 0.7 7.6 3.8 0.65
MF-RM033/240 2 Sn/Cu
(0.449) (0.787) (0.201) (0.028) (0.299) (0.150) (0.026)
11.5 20.9 5.1 0.7 7.6 3.8 0.65
MF-RM040/240 2 Sn/Cu
(0.453) (0.823) (0.201) (0.028) (0.299) (0.150) (0.026)
14.0 22.4 5.1 0.7 7.6 4.1 0.81
MF-RM055/240 2 Sn/Cu
(0.551) (0.882) (0.201) (0.028) (0.299) (0.161) (0.032)
0.51 (24AWG) MM
Packaging options:
DIMENSIONS:
0.65 (22AWG) (INCHES)
BULK: 500 pcs. per bag.
0.81 (20AWG)
TAPE & REEL: 2000 pcs. per reel (MF-RM005/240~MF-RM040/240); 1000 pcs. per reel (MF-RM055/240)
Style 1 Style 2
Typical Part Marking
A
A E E
Represents total content. Layout may vary.
MANUFACTURER'S
TRADEMARK
PART
IDENTIFICATION
RM055
0220S
B B DATE CODE
(FIRST DIGIT =
COUNTRY OF
LAST DIGIT OF YEAR;
MANUFACTURE
NEXT THREE DIGITS =
(T = TAIWAN
DAY OF YEAR)
S = CHINA)
Specifications are subject to change without notice.
Users should verify actual device performance in their
D D
specific applications.
LEAD
LEAD
The products described herein and this document are
DIA.
DIA. C C
subject to specific legal disclaimers as set forth on the
Also available with straight leads (see How to Order).
last page of this document, and at www.bourns.com/
docs/legal/disclaimer.pdf.