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Design and Operating Principles

KLIXON® 3MP consists of a metal housing with an integrated terminal. The housing holds the pre-set KLIXON® snap action bimetal disc. The split plate carries a resistive S-shaped wire which provides additional current sensitivity. The advanced contact system - one on the bimetal disc and one on the plate - in combination with the strong disc guarantees a long life and reliable cycling. The combination of a variety of standard terminal configurations and carefully selected materials provides easy handling and mounting. Customized terminal configurations are available on request. Wires including connectors can be automatically attached to the standard crimp terminal. Sensata Technologies supplies a range of standard lead configurations; customized solutions are available on request. In construction where the 3MP device is contacting conductive parts of the motor assembly, Sensata Technologies can deliver the devices with a Mylar™ insulation sleeve. Customized coding and coloring of the coding tape is an option on request.

The operating principle of the 3MP is both simple and effective. The protector is actuated by current passing through it and by the heat received from the surrounding parts. The electrical circuit is interrupted when the disc reaches its pre-set temperature. As the device cools down to a safe temperature, the contacts will automatically reset. The bimetal disc provides excellent thermal and current sensitivity in an overload situation. Under locked rotor conditions the integrated heater in combination with the bimetal disc provide very accurate trip times for maximum protection.


The 3MP is widely used throughout the world in electric motors for washing machines, dishwashers, dryers, vacuum cleaners and industrial applications in the 120 and 250 Vac applications. 3MP  features permit to move the motor protector location outside the winding, providing the motor manufacturer extra flexibility during the manufacturing process. The recent certification as a thermal cut-out device combined with its unique current sensitivity, positions the 3MP as an advanced and cost effective solution to protect toroidal transformers.



Standard operating temperature rangeFrom 80°C - 170°C (Increments 5K)
Tolerance on open temperature± 5K
Peak Temperature (5 Min)200°C
Max. Ambient TemperatureT-Open +20°C
Time Check at T-Ambient 25°C4 to 10 seconds
Contact Rating27.5 A @cos 1 / 250 VAC / 500 cycles
18 A @cos 0.6 / 250 VAC / 1.000 cycles
18 A @cos 0.6 / 120 VAC / 15.000 cycles



Declarations to EN60730-2-9 Declarations to EN60730-2-2
Purpose of the Control Thermal Cut-Out Thermal Motorprotector
Construction Incorporated, non-electric  
Degree of Protection IP00  
Terminals for Ext. Conductors For internal conductors only  
Method of (Dis)Connection of Terminals Soldering, spotwelding  
Temperature Limits of the Switchhead 170°C  
PTI of Insulation Materials PTI 175 PTI 175
Method of Mounting Off-winding, fixed position, no mounting limitation Off-winding, fixed position, no mounting limitation
Operating Time For continuous operation  
Type of Action Type 2B Type 3C
Reset Characteristic Automatic Automatic
Extent of Sensing Element Whole control  
Control Pollution Degree Degree 1 Degree 2