BOURNS SMD Thermal Cut Off Fuse, 12A, 28V, 77°C

The BOURNS SMD Thermal Cut Off Fuse is a miniature, surface-mount protection device engineered for reliability in compact electronic assemblies. Part of the Komatsulite SA series, it is designed to provide both overtemperature and overcurrent protection, making it a critical safety component for modern battery management systems and power circuits.

Rated for 12A at 28V DC, this thermal cutoff (TCO) acts virtually instantaneously to control abnormal and excessive current. Its primary function is to safeguard sensitive components, particularly lithium polymer and prismatic cells, from the risks associated with thermal runaway and electrical faults. By interrupting the circuit at a precise functioning temperature of 77°C, it helps prevent potential damage or hazardous situations.

A key feature of this resettable fuse is its holding temperature of 40°C (minimum). Once the fault condition is cleared and the device cools below this threshold, it automatically resets, restoring the circuit without the need for manual replacement. This makes it ideal for applications where maintenance access is difficult or where continuous operation is desired after a temporary fault.

The surface-mount (SMD) design facilitates automated assembly processes, saving time and cost in high-volume manufacturing. Its compact form factor allows for integration into space-constrained PCB layouts without compromising on safety performance.

Specifications

• Fuse Current: 12A
• Voltage Rating: 28V DC
• Functioning Temperature: 77°C
• Holding/Reset Temperature: 40°C (minimum)
• Terminal Type: SMD (Surface Mount Device)
• Product Range: Komatsulite SA
• Dimensions: 43mm (H) x 33mm (W) x 15mm (D)
• Weight: 0.05 grams

This fuse is an essential, reliable choice for designers and engineers seeking robust, resettable protection for their DC low