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Thermal Cut-Offs SDF 15A 250V

Thermal Fuses

The SDF Thermal Cut-Offs (Organic Thermal Element Type) are used to prevent fires caused by abnormal heat generation from circuits and other heat producing electrical products. They are a non-resettable thermal fuse which open electrical contacts when temperatures exceed the specified level.

SDF (15 Amp 250V)

Applications

Electric home appliances and heating devices, Coil-winding products and power supplies, Office equipment and telecommunication devices, Automobiles & other electronic components.

General

Our Thermal Cut-Offs (Organic Thermal Element Type) are used to prevent fires caused by abnormal heat generation from circuits and other heat producing electrical products. They are a non-resettable thermal fuse which open electrical contacts when temperatures exceed the specified level.

Applications

• Electric home appliances and heating devices
• Coil-winding products and power supplies
• Office equipment and telecommunication devices
• Automobiles & other electronic components

Operating Principle

When the ambient temperature rises to the functioning temperature, the thermal element melts and the springs move the contact away and open the circuit permanently.

Cautions

• Bends in leads should be at least 3mm from the body of the TCO.
• Extreme caution must be used while soldering, use a heatsink and avoid heating above Tf -24°C.
• The metal portion of the TCO is electrically live and may require insulation.
• Do not use in liquids or poisonous gasses such as sulfuric acid or nitrous oxide.
• Do not connect heater directly to the cutoff.

Approvals

UL & cUL: E117626
VDE: 115369, 116219
PSE: JET2926-32001-1001-1009
CCC: 2003010205079617
EK: HH05009-2004A-2019A

Dimensions (mm)

Type A (L1) B (L2)
S = Standard 25.4 35.0
L = Long 35.0 35.0
Option Custom made Custom Made

Ratings

TF = Functioning Temperature    TH = Holding Temperature
Part No. UL/cUL VDE CCC PSE TF (†C) TH (†C)
DF66S O O O O 66 42
DF72S O O O O 72 50
DF77S O O O O 77 55
DF84S O O O O 84 60
DF91S O O O O 91 67
DF98S O O O O 98 76
DF100S O O O O 100 78
DF104S O O O O 104 80
DF110S O O O O 110 86
DF115S O 115 95
DF119S O O O O 119 95
DF121S O 121 95
DF128S O O O O 128 106
DF132S O 132 110
DF139S O O 139 117
DF141S O O O O 141 117
DF144S O O O O 144 120
DF152S O O O O 152 128
DF167S O O O O 167 142
DF169S O 169 145
DF170S O O O O 170 146
DF179S O 179 155
DF184S O O O O 184 160
DF192S O O O O 192 162
DF216S O O O 216 191
DF222S O 222 195
DF228S O O O O 228 193
DF240S O O O O 240 200
DF260S 260 220
DF280S 280 230

[O] APPROVED [ – ] APPLIED FOR TOLERANCE: +0°C, -5°C

Rated Voltage
& Current Max.

EK 250V/15A
UL/cUL 125V/15A
250V/10A
250V/16A
VDE 250V/15A
PSE 125V/15A
250V/15A
CCC 250V/15A

Determine the Proper Series

Refer to the diagram on the right when determining the correct temperature setting.
• Tp : The highest temperature of the product to which a cutoff is to be attached.
• Th : The safe temperature range for use of the cutoff.
• Ts : 24°C (Tp-Th) (Apply 35°C for Ts value when Tp is higher than 170°C.)
• To : The heating temperature caused by electrical load (Please refer temperature / current correlation curve)
• +α :
1. Self heating of lead wire
2. Structure of ventilation or airtightness
3. Location of connecting terminal
4. Thickness of insulated covering material
5. Best condition value considering electric voltage changes

Tp + Ts + To +α = Applicable Temperature

Safe Temperature Range

• The increasing temperature by remaining heat in the cutoff after melting is required to remain below Tm.
• The temperature of the area where a cutoff will be attached should not reach overTh under normal usage conditions.