Ceramic Tube Fuses for Reliable Overcurrent Protection
Fast-Acting and Time-Delay Designs | 0.2A–63A | Up to 1000V
Fast-Acting and Time-Delay Designs | 0.2A–63A | Up to 1000V
PROSEMI offers a comprehensive range of fast-acting and time-delay ceramic tube fuses in multiple sizes, including 5×20 mm, 6×32 mm, 6×25 mm, and 10×38 mm. These fuses support rated currents from 0.2 A to 63 A and are designed to meet the demands of modern power and industrial applications.
Commonly referred to as power fuses or ceramic cartridge fuses, these products support rated voltages from 63 VDC up to 1000 VDC/VAC, providing reliable overcurrent protection in high-performance systems. Popular current ratings such as 5 amp, 10 amp, 12 amp, 15 amp, 20 amp, 25 amp, and 30 amp are kept in stock to support urgent procurement and short lead-time requirements. Standard lead time is 4–8 weeks for production orders.
Please download the product datasheet below for detailed electrical specifications, dimensional drawings, and application guidelines. For samples, technical support, pricing, or fuse cross-reference solutions, please contact our sales team.
Ceramic Tube Fuses has excellent cycling capability and AC & DC performance, low watt losses with less heating and power consumption in circuit. Low I²t and peak let-through currents meet most semiconductor requirements.
Ideal for a wide range of industries, including automotive, industrial, power supplies, and consumer electronics, the PROSEMI Ceramic Tubu Fuse is known for its high breaking capacity, robust construction, and excellent temperature stability. Its ceramic body provides enhanced resistance to heat and vibration, making it a reliable choice in demanding environments.
| Part number | Interrupting Rating | Voltage Rating (V) | Ampere Rating (A) | Typical Cold Resistance (mΩ) | Typical Melting I²t (A²Sec) | Dimension (mm) | 1.0In Power loss (W) | Automotive | Datasheets |
|---|---|---|---|---|---|---|---|---|---|
| 6CT2-3A | 1000Vdc@10kA | 1000VDC | 3 | 60 | 7.54 | 6x32mm | - | No | |
| 6CT5-20A | 250Vac@1000A 150Vdc@1000A | 250VAC | 20 | 4 | 680 | 6x32mm | - | Yes | |
| 6CT5-25A | 250Vac@1000A 150Vdc@1000A | 250VAC | 25 | 3 | 1300 | 6x32mm | - | Yes | |
| 6CT5-30A | 250Vac@1000A 150Vdc@1000A | 250VAC | 30 | 2.5 | 1450 | 6x32mm | - | Yes | |
| 6CT5-35A | 250Vac@1000A 150Vdc@1000A | 250VAC | 35 | 2 | 2350 | 6x32mm | - | Yes | |
| 6CT5-40A | 250Vac@1000A 150Vdc@1000A | 250VAC | 40 | 1.65 | 3100 | 6x32mm | - | Yes | |
| 6CT5-50A | 250Vac@1000A 150Vdc@1000A | 250VAC | 50 | 1.23 | 7350 | 6x32mm | - | Yes | |
| 6CT6-10A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 10 | 17.1 | 100 | 6x32mm | - | No | |
| 6CT6-12A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 12 | 12.3 | 140 | 6x32mm | - | No | |
| 6CT6-15A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 15 | 8 | 66 | 6x32mm | - | No | |
| 6CT6-16A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 16 | 8 | 62 | 6x32mm | - | No | |
| 6CT6-20A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 20 | 5.5 | 120 | 6x32mm | - | No | |
| 6CT6-25A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 25 | 4.6 | 200 | 6x32mm | - | Yes | |
| 6CT6-30A | 500VAC@30KA 500VDC@20KA | 500VAC/DC | 30 | 3.7 | 270 | 6x32mm | - | No | |
| 6CT7-10A | 500Vac/dc@1000A | 500VAC/DC | 10 | 17.1 | 100 | 6x32mm | - | Yes | |
| 6CT7-12A | 500Vac/dc@1000A | 500VAC/DC | 12 | 12.3 | 140 | 6x32mm | - | Yes | |
| 6CT7-15A | 500Vac/dc@1000A | 500VAC/DC | 15 | 8 | 66 | 6x32mm | - | Yes | |
| 6CT7-16A | 500Vac/dc@1000A | 500VAC/DC | 16 | 8 | 62 | 6x32mm | - | Yes | |
| 6CT7-20A | 500Vac/dc@1000A | 500VAC/DC | 20 | 5.65 | 125 | 6x32mm | - | Yes | |
| 6CT7-25A | 500Vac/dc@1000A | 500VAC/DC | 25 | 3.8 | 390 | 6x32mm | - | Yes | |
| 6CT7-30A | 500Vac/dc@1000A | 500VAC/DC | 30 | 3.1 | 600 | 6x32mm | - | Yes | |
| 6CT8-20A | 500Vac@1000A | 500VAC | 20 | 5.1 | 268 | 6x32mm | - | Yes | |
| 6CT8-25A | 500Vac@1000A | 500VAC | 25 | 4 | 465 | 6x32mm | - | Yes | |
| 6CT8-30A | 500Vac@1000A | 500VAC | 30 | 3 | 873 | 6x32mm | - | Yes |
A: When selecting a ceramic tube fuses, both the rated voltage and rated current must be carefully considered to ensure safe and reliable operation.
(1) Selecting the Rated Voltage The rated voltage of a fuse is the maximum voltage at which it can safely interrupt a circuit.
①The fuse’s rated voltage must be equal to or higher than the circuit’s operating voltage.
②A fuse with a lower voltage rating than the circuit voltage must never be used.
Example:
①A 3A / 125V fuse cannot be used in a 250V circuit.
②A 3A / 250V fuse can be safely used in both 125V and 250V circuits.
(2)Selecting the Rated Current
The rated current of a fuse should be selected based on the circuit’s normal operating current and operating conditions.
Key factors to consider include: Normal operating current (Irm), Ambient temperature and derating factors, Inrush or surge current (I²t value), Expected number of current surges during product lifetime
A commonly used calculation method is:
In ≥ Irm / (Sc × Tc), Where: In = Rated current of the fuse
Irm = Maximum normal operating current of the circuit
Sc = Safety derating factor
0.75 (UL standard)
0.9 (IEC standard)
0.85 (JIS standard)
Tc = Temperature derating factor (refer to the fuse’s temperature derating curve)
The selected fuse rating should always be equal to or higher than the calculated value to ensure reliable operation and avoid nuisance blowing.
Summary:
①Choose a rated voltage ≥ circuit voltage
②Calculate rated current based on operating current, temperature, and safety factors
③Consider inrush current and application conditions
④Select the nearest higher standard fuse rating for reliable performance
A: Yes. Our Ceramic Cartridge Fuses comply with major international safety and environmental standards. They are UL certified and manufactured using lead-free materials, meeting RoHS compliance requirements.
These certifications ensure that our Ceramic Cartridge Fuses meet recognized safety, reliability, and environmental standards, making them suitable for use in a wide range of global Power Electronics, Industrial Energy, and New Energy Vehicles applications.
A: A ceramic tube fuses is a single-use overcurrent protection device designed to protect electronic circuits from damage caused by excessive current. When an abnormal overcurrent occurs, the fuse element rapidly heats up and melts, permanently opening the circuit and preventing further damage to sensitive components.
Ceramic tube fuses operate by converting excessive electrical current into heat. Once the current exceeds the rated limit, the internal fuse element melts and breaks the circuit. Because this process is irreversible, the fuse must be replaced after it operates.
A: Fast-acting surface mount ceramic cartridge fuses respond very quickly to overcurrent conditions. They are designed to open the circuit almost immediately when a fault occurs, making them ideal for protecting sensitive electronic components such as ICs, semiconductors, and precision circuits where even short-duration overcurrent can cause damage.
Time-delay (slow-blow) surface mount brick fuse, on the other hand, are designed to withstand temporary inrush currents without opening. They are commonly used on the input side of power supplies or circuits where a brief surge occurs during startup. This inrush current is normal and not considered a fault, so a time-delay fuse allows the system to start safely without nuisance tripping.
In summary:
Fast-acting fuses protect sensitive components by reacting immediately to abnormal current.
Time-delay fuses tolerate short-term surge currents and are better suited for power input and high-inrush applications.
A: Our ceramic cartridge fuses are available in multiple industry-standard package sizes to support a wide range of circuit designs and power requirements.
Available package sizes include: 5x20mm, 6x25mm, 6x32mm, 10x38mm Voltage ratings include: 63VDC, 75 VDC, 150 VDC, 250 VAC, 300 VAC/ DC, 400 VDC, 500 VDC/ AC, 600 VAC/ DC, 1000 VAC/ DC,
These options allow engineers to select the appropriate fuse based on system voltage, space constraints, and application requirements, ensuring safe and reliable overcurrent protection across a wide range of electronic designs.
A: Yes. Samples and technical support are available upon request. Our engineering team can assist with product selection, application evaluation, and technical documentation to support your design and development needs.
Prosemi Technology, as a leading company in the field of precision current sensing components, is dedicated to providing customers with high-performance and high-reliability solutions. Our precision alloy current-sensing resistors, including SMD chip resistors and shunt resistors, are designed for a variety of applications, helping your products achieve accurate current detection and efficient energy management.
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