Type 5MA3: Thermal cut outs, 10 and 16A 250V, axial wires



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 to 1°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 (Th):

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 500 V.

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 overheat.

– TCO replacement must be made by exactly the same model of the same supplier.


Main references

Reference with 10A rating Reference with 16A rating Rated functioning temperature °C/°F (Tf) Holding temperature °C/°F (Th) Maximum temperature °C/°F (Tm)
5MA3SPF070019340 5MA3SPF070H19340 73°C/163.4°F 45°C/113°F 115°C/239°F
5MA3SPF077019340 5MA3SPF077H19340 79°C/174.2°F 52°C/125.6°F 125°C/257°F
5MA3SPF084019340 5MA3SPF084H19340 85°C/185°F 57°C/134.6°F 125°C/257°F
5MA3SPF091019340 5MA3SPF091H19340 94°C/201.2°F 66°C/150.8°C 140°C/284°F
5MA3SPF096019340 5MA3SPF096H19340 99°C/210.2°F 71°C/159.8°F 140°C/284°F
5MA3SPF106019340 5MA3SPF106H19340 108°C/226.4°F 77°C/170.6°F 145°C/293°F
5MA3SPF109019340 5MA3SPF109H19340 113°C/235.4°F 84°C/183.2°F 150°C/302°F
5MA3SPF121019340 5MA3SPF121H19340 122°C/251.6°F 94°C/201.2°F 175°C/347°F
5MA3SPF129019340 5MA3SPF129H19340 133°C/271.4°F 101°C/213.8°F 175°C/347°F
5MA3SPF139019340 5MA3SPF139H19340 142°C/287.6°F 114°C/237.2°F 185°C/365°F
5MA3SPF152019340 5MA3SPF152H19340 157°C/314.6°F 127°C/260.6°F 195°C/383°F
5MA3SPF165019340 5MA3SPF165H19340 167°C/332.6°F 130°C/266°F 205°C/401°F
5MA3SPF169019340 5MA3SPF169H19340 172°C/341.6°F 145°C/293°F 215°C/419°F
5MA3SPF182019340 5MA3SPF182H19340 184°C/363.2°F 156°C/312.8°F 225°C/437°F
5MA3SPF188019340 5MA3SPF188H19340 192°C/377.6°F 164°C/327.2°F 245°C/473°F
5MA3SPF216019340 5MA3SPF216H19340 216°C/420.8°F 189°C/372.2°F 280°C/536°F
5MA3SPF227019340 5MA3SPF227H19340 227°C/440.6°F 190°C/374°F 295°C/563°F
5MA3SPF240019340 5MA3SPF240H19340 240°C/464°F 190°C/374°F 305°C/581°F



2D&3D Drawing