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 Thermal Cut-Offs SDF 15A 250V  
PDF

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.

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.

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

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)
DF50S
-
-
-
O
50
30
DF57S
-
-
-
O
57
37
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)

:
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 over Th under normal usage conditions.

 

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(800) 561-7207 | sales@cantherm.com
Canadian Thermostats & Control Devices Ltd.