TOPRO KW-A2 series Thermal Protectors and Thermal Switches are featured by advanced bimetal disc structure, miniature size, snap action, large contact capacity, and long service life. They are widely used for overheat protection in fractional horsepower electric motors, electrical heating appliances, fluorescent ballasts, transformers, automobile motors, integrated circuits and common electrical appliances.
Descriptions
Why you should be using TOPRO KW Series Thermal Protectors in your product:
* Miniature size, easy to install.
* Individually temperature calibrated and checked.
* Positive make and break with TOPRO snap action bimetal disc.
* Repeatable temperature performance over life.
* Available in metallic shell and plastic shell.
* Temperature sensitivity for maximum design flexibility.
* Wide selection of leads and imported Mylar insulating sleeves.
* Strict RoHS environmental standard implemented for each component.
* Cadmium free silver-nickel alloy contacts
* Wide selection of trip off temperatures
* Internal resistance as low as below 50 milliohm
* Optional Normally Close type and Normally Open type
* High temperature resistant lead wire, customizable as per customer requirements
Specifications:
* Electric Parameter: DC12V 12A, DC24V 10A, AC120V 8A, AC250V 6A
* Contact Life Cycles: No less than 10,000 cycles
* Trip off Temperatures: 50 ~ 150 degrees centigrade.
* Temperature Tolerance: +/-5 degrees centigrade
* Reset Temperature: 10 ~ 45 degrees centigrade below the trip off temperatures.
* Internal resistance: Below 50 milliohm
Certifications
All our products of KW series are certified with UL, cUL, VDE, CQC, and RoHS and REACH environmental protection decrees are strictly implemented. Larger and clear reports are available upon request when appropriate.
Please contact us to request for clear copies of the certificates and test reports of the certifications when necessary.
Dimensions
KW-A2 metal shell: 20.0x7.4x3.8mm
Working Principle
This thermal protector will cut off the circuit automatically in case of overload or overheat. KW series thermal protectors use the same snap-action principle of KLIXON protectors. The bimetal disc senses the heat from the equipment which the protector is installed on. When the temperature of the disc reaches a predetermined calibration point, the disc snaps open the contacts, thus breaking the current path. When the equipment returns to a normal operating range, the protector resets (closes circuit) automatically.
Temperature Code
|
Action Temperature (°C) |
Reset Temperature (°C) |
Action Temperature (°C) |
Reset Temperature (°C) |
Action Temperature (°C) |
Reset Temperature (°C) |
|||||
| 50±5 | 30±8 | 90±5 | 60±15 | 130±5 | 90±15 | |||||
| 55±5 | 35±10 | 95±5 | 65±15 | 135±5 | 95±15 | |||||
| 60±5 | 40±10 | 100±5 | 65±15 | 140±5 | 100±15 | |||||
| 65±5 | 45±10 | 105±5 | 70±15 | 145±5 | 105±15 | |||||
| 70±5 | 45±15 | 110±5 | 75±15 | 150±5 | 110±15 | |||||
| 75±5 | 50±15 | 115±5 | 75±15 | Special specs are customizable as per customer requirements | ||||||
| 80±5 | 55±15 | 120±5 | 80±15 | |||||||
| 85±5 | 55±15 | 125±5 | 85±15 | |||||||
Differential of terms: thermal protector, thermal switch, thermal protection switch, temperature switch, Thermal Cut-out, temperature controller, thermostat
The terms thermal protector, thermal switch, temperature switch, temperature controller and thermostat all refer to a mechanical device that contains a bimetallic strip sensitive to temperature and is therefore used to trigger a snap action when the temperature rises to a preset point. The snap action can cut off or put through power supply to control the protected device.
Thermal protector is the most standard term. As in most cases a thermal protector is used to protect the motor of a machine, such as vacuum cleaner, power tools, mower, washing machine, compressor, the thermal protector is often referred to as a motor thermal protector or a thermal motor protector. As the thermal protector can make or break the circuit like a usual switch, it is also called a thermal switch or temperature switch. Since they are made with the key component, a bimetallic strip, they are also called bimetal Thermal Switches. A thermostat or temperature controller is used to control the temperature within a certain range. Unlike the motor thermal protector, the thermostat and temperature is often used in a heating device. Literally, thermal protection switches are the same as thermal protectors or thermal switches.
TOPRO 17AM1 Motor Thermal Protectors are the same in quality and structure as 17AM thermal protectors made by Klixon, but much lower in price.
