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Klixon MM Series |
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2MM Series |
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8MM Series |
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Industrial appliances |
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Domestic appliances |
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Small, compact motors |
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Fan motors |
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Small pump motors |
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Coils |
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Solenoid valves |
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Transformers |
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Sensata > Products > Controls > Motor Controls >
Klixon® 8MM series motor protector and thermal cut–out
Miniature, high current capability
| Features and Overview |
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Snap–action Klixon disc |
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UL, ENEC, CSA approvals |
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Robust design for all in– and on–winding applications |
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Fault conditions and contact rating up to 7 Amps |
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High current capability |
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Temperature and current sensitive |
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Miniature: the 8MM is our smallest motor protector, measuring less than 11mm long and only 2.7mm high |
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Robust and reliable |
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Manufactured on fully automatic state-of-the-art equipment |
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3 versions available: basic metal, without wire leads, or with epoxy resin and wire leads |
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Various configurations available |
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Variety of leads available, with tabs on customer request |
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CODE: 8MM Series |
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The 8MM can be built to your requirements. This compact motor protector provides locked rotor and overload protection in a wide range of industrial and comestic appliances.
Its design uses a sealed nickel-zinc plated steel can that holds and protects the inner components against infiltration as well as mechanical deformation. The 8MM is supplied in the basic metal version, without wire leads, or with shrinkable sleeve and wire leads, or with epoxy resin and wire leads. The can contains the calibrated Klixon® disc, carrying a contact of silver-nickel. The fixed contact is placed on the oposite side, separated from the termina by an insulator.
The operating principle of the 8MM is both simple and effective. A current flows through the resistive Klixon bimetal disc. When a fault condition occurs, the increased current and shell temperature heats up the bimetal disc which snaps and opens the contacts. The contacts close again automatically as the device cools down to a safe running temperature.
Protecting against locked rotor and overload conditions, this compact device is ideal for a wide range of
industrial and domestic appliance applications. In single–phase motors, it can be mounted directly in the
main circuit to serve as an on– or in–winding protector. Its compact size provides ease of installation, even
in small spaces.
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| Design and Operating Principles |
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The 8MM design utilizes a sealed nickel–zinc plated steel can that holds and protects the inner components against infiltration as well as mechanical deformation. The can contains the Klixon disc, carrying a contact of silver–nickel. The fixed contact is placed on the opposite side, separated from the terminal by an insulator.
The operating principle of the 8MM is both simple and effective. A current flows through the resistive Klixon bimetal disc. when a fault condition occurs, the increased current and ambient temperature make the bimetal disc snap open the contacts. The contacts close again automatically as the device cools down to a safe running temperature. |
| Performance Characteristics |
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Standard Operating Temperature Range |
70°C to 160°C in increments of 5K |
Tolerance on Open Temperature |
±5K (±10K version is available) |
Maximum Ambient Temperature |
175°C |
Differential |
20K minimum |
High Current Capability |
250Vac, 10A, 3,000 cycles
250Vac, 4A, 10,000 cycles |
Contact Rating Thermal Cutout |
8MMxxx-L: 4.5(1.6)A 250VAC (10,000 cycles) |
8MMxxx-H: 7(3)A 250VAC (3,000 cycles) |
8MMxxx-H: 10(2)A 250VAC (3,000 cycles) |
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UL |
File number E15962 |
UL2111 limited short circuit capability |
CSA |
File number LR11372-120 |
CSA-C22.2 No 77/95 motor controller |
ENEC |
File number 2014531.09 |
EN60730-2-2 thermal motor protector |
File number 2014531.09 |
EN60730-2-9 thermal cut–out |
| Declarations to EN60730-2-9 |
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Purpose of the control |
Thermal cut–out |
Temperature limits of the switchhead |
175°C with and without Mylar sleeve
150°C with epoxy |
PTI of insulation materials |
PTI 175 |
Method of mounting |
On-winding or by special means in the appliance |
Operating time |
For continuous operation |
Type of action |
Type 2C |
Reset characteristic |
Automatic |
Extent of sensing element |
Whole control |
Control pollution degree |
Normal |
| Declarations to EN60730-2-2 |
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Purpose of the control |
Thermal motor protector |
PTI of insulation materials |
PTI 175 |
Method of mounting |
On-winding or by special means in the appliance |
Type of action |
Type 3C |
Reset characteristic |
Automatic |
Control pollution degree |
Normal |
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