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PFSM100 Datasheet Preview

PFSM100 Datasheet

Surge Tolerant Cartridge Fuses

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Selector Chart For Fuses
Resettable
Polymeric PTC
NEW
ISO 9001 / ISO 14001
Series
Page
Mounting terminals
Hold current IH @ 23˚C
Fuses cross to competitive resettable devices. See our online cross list at http://www.schurterinc.com/cross.htm
PFMD
106 -108
surface mount
200mA to 1.1A
PFSM
109 - 111
surface mount
300mA to 2.5A
PFRA
112 -115
radial leaded
100mA to 9A
PFRX
116 -118
radial leaded
1.1A to 3.75A
PFST/PFLT
119 - 122
strap (standard or slotted)
1A to 4.2A
Non-
Resettable
Surface Mount
Series / Voltage
Page
Rated current
Time/current action
Through-Hole
NEW
EIA 1206
With or without
fuse clips
NEW
Time-lag
version OMT
MGA 125V
127
200mA to 5A
quick-acting
SFP 63V; SFC 63V
128-129
1A-5A; 800mA-4A
quick-acting
OMF 63V
130-131
63mA to 10A
quick-acting
NEW
OMF 125
132-133
63mA to 10A
quick-acting
New MSB / MKT
Time lag versions
OMF/OMT 125/250V MELF/MKF 125V
134 135-136
250mA to 4A
125mA to 7A
quick-acting or time-lag quick-acting or time-lag
NEW
UL listed versions
MSF-U & MST-U
NEW
With radial leads
Series / Voltage
Page
Rated current
Time/current action
MSA 125V
137
63mA to 15A
quick-acting
Hermetically
sealed
MGL 125V
138
200mA to 5A
quick-acting
MSF 125V
139
100mA to 5A
quick-acting
MSF 250V
140
40mA to 5A
quick-acting
MXT with high
breaking capacity
MST/MXT 250V
FRT 250V
141/142
143
50mA to 6.3A
250mA to 6.3A
time-lag
quick-acting or time-lag
5 x 20mm
Series
Page
Quick-acting and time-lag characteristics available, with low, medium or high breaking capacities. Pigtail leads optional.
SA/SP/SPT/FSM FSF/FST/FTT/FSM
All series
Fuse kits for prototypes
144 -154
144 - 154
144 - 154
156
Telecom
Surge-Tolerant for
Telecom applications
Series / Voltage
Page
Rated current
Time/current action
OSU 125V
162
250mA to 3.15A
quick-acting
OSU / OMT 250V
162
250mA to 3.15A
quick-acting
MSU 125V
163
250mA to 3.15A
quick-acting
MSU 250V
163
250mA to 3.15A
quick-acting
FRT 250V
164
250mA to 3.15A
quick-acting
FSU / SSU 250V
165-166
250mA to 3.15A
quick-acting
102 Schurter, Inc. • Phone 707-778-6311 • Fax 707-778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com




Schurter

PFSM100 Datasheet Preview

PFSM100 Datasheet

Surge Tolerant Cartridge Fuses

No Preview Available !

www.DataSheet4U.com
ST350
RA090
RA075
RA060
RA600
RA400
RA300
RESETTABLE CIRCUIT PROTECTION
When it comes to Polymeric Positive Temperature
Coefficient (PPTC) circuit protection, you now have a
choice. If you need a reliable source, look to polymeric
resettable fuses from SCHURTER.
Polymeric fuses are made from a conductive plastic
formed into thin sheets, with electrodes attached to either
side. The conductive plastic is manufactured from a non-
conductive crystalline polymer and a highly conductive
carbon black. The electrodes ensure even distribution of
power through the device, and provide a surface for leads
to be attached or for custom mounting.
The phenomenon that allows conductive plastic materials
to be used for resettable overcurrent protection devices is
that they exhibit a very large non-linear Positive
Temperature Coefficient (PTC) effect when heated. PTC
is a characteristic that many materials exhibit whereby
resistance increases with temperature. What makes the
polymeric conductive plastic material unique is the
magnitude of its resistance increase. At a specific
transition temperature, the increase in resistance is so
great that it is typically expressed on a log scale.
HOW POLYMERIC RESETTABLE
OVERCURRENT PROTECTORS WORK
The conductive carbon black filler material in the
polymeric device is dispersed in a polymer that has a
crystalline structure. The crystalline structure densely
packs the carbon particles into its crystalline
boundary so they are close enough
together to allow current to flow
through the polymer insulator
via these carbon Òchains.Ó
When the conductive
plastic material is
at normal room
temperature, there
are numerous carbon
chains forming conductive
paths through the material.
Under fault conditions, excessive current flows through
the polymeric device. I2R heating causes the conductive
plastic materialÕs temperature to rise. As this self heating
continues, the materialÕs temperature continues to
rise until it exceeds its phase transformation
temperature. As the material passes through this
phase transformation temperature, the densely packed
crystalline polymer matrix changes to an
amorphous structure. This phase change is
accompanied by a small expansion. As the
conductive particles move apart from each other, most of
them no longer conduct current and the resistance of the
device increases sharply.
The material will stay Òhot,Ó remaining in this high
resistance state as long as the power is applied. The
device will remain latched, providing continuous
protection, until the fault is cleared and the power is
removed. Reversing the phase transformation allows the
carbon chains to re-form as the polymer re-crystallizes.
The resistance quickly returns to its original value.
107
106
105
104
103
102
101
100
0
20 40
60
80 100 120 140
TEMPERATURE °C
104 Schurter, Inc. ¥ Phone 707-778-6311 ¥ Fax 707-778-6401 ¥ E-mail info@schurter.com ¥ Website http://www.schurter.com


Part Number PFSM100
Description Surge Tolerant Cartridge Fuses
Maker Schurter
Total Page 30 Pages
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