KSD-01F H80C TO-220 (2leg) Code: 69752621

The KSD-01F H80C is a snap-action bimetallic thermal switch. It is a normally open (N.O.) sensor that trips and closes the circuit when the temperature reaches 80°C. The “H” denotes Normally Open, while “80C” designates the action threshold.

Key Specifications & Features

• Action Type:Normally Open (N.O.)
• Action Temperature:80°C ± 5°C
• Contact Load Rating:Typically up to 250V AC (1A to 1.5A) or 24V DC (3A)
• Form Factor:TO-220 transistor-style metal backplate for easy mounting onto heat sinks or printed circuit boards
• Operating Life:Rated for high precision and efficient regulation

How It Works

Inside the TO-220 housing is a pre-calibrated bimetallic disc. When the surrounding temperature rises to 80°C, the heat causes the disc to warp. This rapid mechanical movement closes the electrical contacts, which can trigger a cooling fan, an alarm, or a thermal shutdown. Once the surface cools, the disc snaps back to its original state, opening the circuit again.

Common Applications

Because of its small footprint and TO-220 design, the switch is highly suitable for space-constrained electronics. It is frequently used for thermal overload protection and cooling control in:

• Computer peripherals and power supplies
• Automotive electronics
• Industrial equipment and welder inverters
• General electrical circuit boards requiring localized overheating protection