Thermal Cut Off Fuse, 25A, 28V, 77 Degrees C

The BOURNS Thermal Cut Off Fuse is a miniature TCO (Thermal Cutoff Device) engineered for reliable overtemperature and overcurrent protection in sensitive electronic circuits, particularly for lithium polymer and prismatic cells. It provides a critical safety function by controlling abnormal or excessive current virtually instantaneously, up to its rated limits.

This device is rated for 25A at 28V DC, ensuring robust protection for low-voltage power systems. A key operational feature is its function temperature of 77°C. Once activated, the fuse will reset only when the temperature drops below a minimum of 40°C, allowing for automatic recovery once safe conditions are restored and preventing permanent circuit failure from transient faults.

Part of the CB Series with terminal protection, this fuse is built for durability and secure connections. Its compact dimensions (15mm depth x 33mm width x 43mm height) make it suitable for integration into space-constrained applications where reliable protection is non-negotiable.

Key Specifications & Features

• Device Type: Miniature Thermal Cut Off (TCO)
• Primary Protection: Overtemperature and overcurrent protection
• Rated Current: 25A
• Rated Voltage: 28V DC
• Functioning Temperature: 77°C
• Reset/Holding Temperature: 40°C (minimum)
• Fuse Terminals: Blade type for secure connection
• Series: CB Series (with Terminal Protection)
• Dimensions: 15mm (D) x 33mm (W) x 43mm (H)
• Weight: 0.355 grams
• SVHC Status: No SVHC (as of 04-Feb-2026)

Ideal for designers and engineers requiring failsafe protection, this thermal fuse offers a dependable solution to enhance the safety and longevity of battery packs and power management systems.