Product Overview
Bel 5TT 3-R 3A 250V Slow Blow Glass Fuse - Unused NOS
The Bel 5TT 3-R is a 3-amp, 250-volt time-delay fuse in the standard 5x20mm glass cartridge format. It’s built for precise overcurrent protection in power supplies, electronics, and industrial equipment where inrush currents demand slow-blow response.
Bel’s fuse line has long been trusted for its consistent calibration and safety compliance. This model carries UL Listing for verified reliability, offering protection in compact circuits that require high interrupt ratings and transparent inspection through its glass body.
Product Condition
Unused, new old stock. Clean and in excellent condition, kept in original packaging.
Product Overview
Bel Fuse Inc. designs precision circuit protection components known for stability and conformance to international standards. The 5TT 3-R fuse combines traditional glass construction with a slow-blow element, offering controlled response to transient surges and overloads.
Key Features
- Current rating: 3A
- Voltage rating: 250V AC
- Fuse size: 5x20mm standard glass body
- Time-delay (slow-blow) characteristic for surge protection
- UL Listed for verified safety performance
- Visible fuse element for inspection without removal
- Nickel-plated brass end caps for stable contact
- Compact format fits standard 5x20mm fuse holders
Applications
- Power supply protection
- Audio and video equipment
- Industrial control panels
- Test and measurement instruments
- Consumer electronics repairs
- Circuit prototyping and development
- Replacement for legacy Bel fuse assemblies
Frequently Asked Questions
Is this a fast-acting or slow-blow fuse?
The 5TT 3-R is a slow-blow fuse, designed to tolerate short inrush currents without nuisance tripping.
What is the fuse’s size format?
It uses the standard 5x20mm cartridge size, common across many electronic and industrial devices.
Does this fuse have safety certification?
Yes, it is UL Listed, confirming it meets U.S. safety and performance standards.
What kind of applications need slow-blow fuses?
They are ideal for circuits with surge currents, such as transformer-based power supplies and motor drives.
What is the condition of this fuse?
It is unused, new old stock (NOS), clean and well-preserved from original factory packaging.
Bel built these fuses to ride out momentary surges without failure—a quiet precision that kept countless circuits alive. Decades later, this one’s next story belongs to you.
