Thermal cut outs, 10 and 16A 250V, axial wires

Overheat protection of electrical or electronic equipment, home appliances, electrical coils and heating components.


Electrical rating


Rated functioning temperature (°C) Tf

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Holding temperature (°C) Th

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Maximum temperature (°C) Tm

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Main application: Overheat protection of electrical or electronic equipment, home appliances, electrical coils and heating components.

Important notice: The proper function of this component not only depends of its rated temperature, but also of its assembly position, connection  and electrical current.

Housing: Silver plated copper. This is a non-insulated electric life part. Protect from human contact and use appropriate design to avoid electrical shocks and hazards. Do not bend or make holes in housing

Ingress    protection:    TCO    are    not    waterproof,    do    not    immerse    in    liquid.

Insulation: 95% alumina, epoxy sealed. Do not submit epoxy sealing to temperature over 200°C

Melting pellet: Organic compound

Mechanism type: spring operated movable contact, operated by the melting pellet

Terminals: tin plated copper wires

Wiring rules:

Mechanical resistance: do not submit TCO wires to pulling force over 16N or pushing force over 4N

Bending: do not bend or cut wires at less than 6 mm from epoxy sealing or housing

Crimping: Do not submit to impact or mechanical force during terminals crimping. Wrong crimping will overheat the wire by Joule effect, fuse will melt, and epoxy seal will burn down. Parts crimped to TCO wires must with have enough mechanical strength and hardness to withstand normal vibration and impact, and it must not cause stresses due to heat dilatation

Tin welding: it is not allowed to use tin welding for fuse with rated temperature under 184°C without proper wire cooling solution to avoid fuse to melt.

Electrical welding: proper wire cooling solution must be used to avoid fuse to melt wire, and welding current cannot go through the fuse;

Shrinkable sleeves: do not use shrinkable sleeves, it will melt down the TCO during the shrinking process

Environment corrosion: TCO must be protected from corrosive environment, air or fumes.

Rated voltage: 250V(AC)

Rated current: 10A and 16A (2 different types)

The rated current is the max current that the TCO can carry without opening or change in calibration temperature, when submitted at a limited temperature named “Holding temperature” (Th), during a limited time.

Rated temperature (Tf): it is the fuse contact opening temperature measured inside calibration oven, with a current lower than 10 mA and a temperature rise of   0.5  to1°C/min.  Opening  temperature  cannot  be  below  Tf -10°C  and  not  higher  than  Tf.  It  is  this  temperature  that  is  printed  on  the  TCO.

Holding temperature (TC): TCO must not open or  be destroyed when submitted during 168 hours at Th-6°C, at nominal voltage and rating

Max ultimate temperature(Tm): It is the maximum temperature that the fuse can withstand, after opening, without change in its mechanical and insulation properties

Electrical strength between contacts after opening: ≥500V

Insulation resistance between contacts after opening: ≥ 0.2MΩ under 500V.

Joule effect temperature increase: lower than 15°C measured at the center of the fuse under nominal load.

Standard: DIN EN60691(VDE 0821):2007-09 EN60691:2003+A1: 2007.IEC60691(ed.3);am1

Product identification:

SPF169: model number

TF172C: rated operation temperature

(Tf) 10A250V:  rated  current  and  voltage

088: production number

Installation and safety instructions:

  • Choose TCO temperature fuse which electrical insulation will not be effected by equipment
  • TCO replacement must be made by exactly the same model of the same supplier


Main references




Technical informations associated to this product

  • Description of temperature controls

    Used as control thermostats or as a safety thermostat with manual reset, these thermostats have a disc made of two different metals laminated together for temperature sensing element. These two metals have different expansion coefficients.
  • Thermostats installation

    The proper functioning of a thermostat depends primarily on the correct choice of the component, but also the conditions of its installation. Conditions used to calibrate regulating and control equipment in the factory are always ideal laboratory conditions, ensuring measurement accuracy and repeatability. These conditions are rarely those found in practice when installing thermostats. However, with a minimum of constraints, it is possible to optimize assemblies.
  • Electrical protection classes

    The housings are designed to protect electrical equipment located inside. This protection must be considered in the electrical and environmental angles.)
  • Important extracts of standards related to control or safety circuits

    §3.8.1 All-pole cut out: Cutting in two conductors in a single operation, or for three phase units, the cut of the three conductors in a single step … Note: for three-phase, the neutral lead is not considered as a power conductor.