Thermal & Magnetic
Thermal
•Typically less expensive.
•Trip point varies with the ambient temperature.
Magnetic
•Typically more expensive.
•Temperature stable over a wide range.
•Available with different time delays before tripping.
•One- through four-pole models.
Here is a Tyco W57 series one, Tyco seems to have reasonable quality Thermal ones although this one is not temperature compensated.
You can get the temperature compensated ones which seem to be the best overall as the normal ones are designed to work within certain temps and like the Tyco and have a lower vibration resistance. They specify as the temp rises the different cut out rates
A brand that is really good are the Klixon and suited to what is needed is the 2TC range.
It has some nice features like
• Miniature size
• Light weight
• Trip free
• Mil-quali cation
• Current rating 1-35 amperes
• Coordinated ratings
• High vibration resistance
• High interrupt capacity
Another brand is E-T-A and Type: 412 goes up to 25amp
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