Thermal Cut-Offs
SDJ1/SDJ2
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.
GENERAL
When the ambient temperature rises to the function-
ing temperature, the thermal element melts and the
springs move the contact away and open the circuit
permanently.
OPERATING PRINCIPLE
UL & cUL: E117626
VDE: 115369, 116219
PSE: JET2926-32001-1001-1009
CCC: 2003010205079617
EK: HH05009-2004A-2019A
APPROVALS
• Electric home appliances and heating devices
• Coil-winding products and power supplies
• Office equipment and telecommunication devices
• Automobiles & other electronic components
APPLICATIONS
DIMENSIONS (mm)
• 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.
CAUTIONS
Division of Microtherm
International Corporation
8415 Mountain Sights Avenue • Montreal (Quebec), H4P 2B8, Canada
Tel:
(514) 739-3274 • 1-800-561-7207 •
Fax:
(514) 739-2902
E-mail:
sales@cantherm.com •
Website:
www.cantherm.com
2007/June
DETERMINE THE PROPER SERIES
•
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
: 24ºC (Tp-Th) (Apply 35ºC for Ts value when Tp is
higher than 170ºC.)
•
To
: The heating temperature caused by electrical load
(Please refer temperature / current correlation curve)
•
+a
:
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 +a = Applicable Temperature
• 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.
SAFE TEMPERATURE RANGE
Microcontroller MCU
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