Electrical, Specialty Fuses

Image Part Number Description / PDF Quantity Rfq
RJS 1.5-R

RJS 1.5-R

Bel Fuse, Inc.

FUSE BRD MNT 1.5A 600VAC RD BEND

0

RJS 750-R

RJS 750-R

Bel Fuse, Inc.

FUSE BRD MNT 750MA 600VAC RADIAL

0

RJS 2-R SHORT

RJS 2-R SHORT

Bel Fuse, Inc.

FUSE BRD MNT 2A 600VAC RAD BEND

0

RJS 2-R

RJS 2-R

Bel Fuse, Inc.

FUSE BRD MNT 2A 600VAC RAD BEND

0

RJS 750-R SHORT

RJS 750-R SHORT

Bel Fuse, Inc.

FUSE BRD MNT 750MA 600VAC RADIAL

0

RJS 1.25-R

RJS 1.25-R

Bel Fuse, Inc.

FUSE BRD MNT 1.25A 600VAC RADIAL

0

RJS 1.5-R SHORT

RJS 1.5-R SHORT

Bel Fuse, Inc.

FUSE BRD MNT 1.5A 600VAC RD BEND

0

RJS 1-R

RJS 1-R

Bel Fuse, Inc.

FUSE BRD MNT 1A 600VAC RAD BEND

0

RJS 1.25-R SHORT

RJS 1.25-R SHORT

Bel Fuse, Inc.

FUSE BRD MNT 1.25A 600VAC RADIAL

0

RJS 125-R STD

RJS 125-R STD

Bel Fuse, Inc.

FUSE BRD MNT 125MA 600VAC RADIAL

441

RJS 3SHORT

RJS 3SHORT

Bel Fuse, Inc.

FUSE BRD MNT 3A 600VAC RAD BEND

0

RJS 300

RJS 300

Bel Fuse, Inc.

FUSE BRD MNT 300MA 600VAC RADIAL

0

RJS 125SHORT

RJS 125SHORT

Bel Fuse, Inc.

FUSE BRD MNT 125MA 600VAC RADIAL

0

RJS 750

RJS 750

Bel Fuse, Inc.

FUSE BRD MNT 750MA 600VAC RADIAL

0

RJS 400SHORT

RJS 400SHORT

Bel Fuse, Inc.

FUSE BRD MNT 400MA 600VAC RADIAL

0

RJS 3

RJS 3

Bel Fuse, Inc.

FUSE BRD MNT 3A 600VAC RAD BEND

0

RJS 1SHORT

RJS 1SHORT

Bel Fuse, Inc.

FUSE BRD MNT 1A 600VAC RAD BEND

0

RJS 100

RJS 100

Bel Fuse, Inc.

FUSE BRD MNT 100MA 600VAC RADIAL

0

RJS 100SHORT

RJS 100SHORT

Bel Fuse, Inc.

FUSE BRD MNT 100MA 600VAC RADIAL

0

RJS 2.5SHORT

RJS 2.5SHORT

Bel Fuse, Inc.

FUSE BRD MNT 2.5A 600VAC RD BEND

0

Electrical, Specialty Fuses

1. Overview

Specialty fuses are precision-engineered circuit protection devices designed to safeguard electrical systems under specific abnormal conditions. Unlike general-purpose fuses, these devices offer tailored performance characteristics for specialized applications, including fast response times, high current interruption capabilities, and environmental resistance. Their importance in modern technology stems from their ability to protect sensitive electronics in critical systems such as medical devices, aerospace equipment, and renewable energy systems.

2. Main Types & Functional Classification

TypeFunctional FeaturesApplication Examples
Current-limiting FusesInterrupt fault currents within milliseconds using special fillersIndustrial motor drives, power distribution panels
Semiconductor FusesMaintain I2t values below 10A s for sensitive component protectionVariable frequency drives, battery management systems
Resettable Fuses (PTC)Automatically reset after fault clearanceConsumer electronics, automotive circuits
High-voltage FusesRated above 1kV with arc suppression technologyEV charging stations, grid-tied solar inverters
Time-delay FusesWithstand temporary current surges without trippingCompressors, transformers, medical imaging equipment

3. Structure & Composition

Typical construction includes: - Ceramic or glass reinforced polymer housing - Silver-plated copper/zinc alloy contacts - Specialized fuse element with controlled melting points - Arc quenching materials (e.g., silica sand) - Temperature-compensated mechanical linkages

4. Key Technical Parameters

ParameterImportanceTypical Range
Voltage RatingDefines maximum operating voltage32V-15kV
Current RatingDetermines normal operation threshold0.1A-2000A
Response TimeTime to interrupt fault current1ms-10s
I2t Let-throughEnergy withstand capability10-1000A s
Ambient Temperature RangeOperational environmental limits-55 C to +125 C

5. Application Fields

Primary industries include: - Industrial automation (PLC systems, CNC machines) - Automotive (EV battery protection, ADAS systems) - Renewable energy (solar inverters, wind turbine controls) - Medical equipment (MRI scanners, patient monitors) - Telecommunications (base stations, data center UPS)

6. Leading Manufacturers & Products

ManufacturerRepresentative ProductKey Features
LittelfuseSSL SeriesSurface-mount PTC for automotive applications
Bussmann170M SeriesCurrent-limiting semiconductor fuse
EatonXLP PlusHigh-performance current-limiting fuse
TE ConnectivityMini29Compact automotive blade fuse

7. Selection Guidelines

Key considerations: 1. Determine circuit voltage/current requirements 2. Analyze fault current characteristics 3. Consider environmental factors (temperature, vibration) 4. Verify compliance with standards (UL/IEC) 5. Evaluate replacement accessibility 6. Calculate required breaking capacity

8. Industry Trends

Emerging developments: - Graphene-enhanced PTC materials for faster response - Integration with IoT-enabled condition monitoring - Miniaturization for 5G infrastructure applications - Environmental compliance with RoHS/REACH standards - Development of hybrid fuse-circuit breaker devices - Increased adoption in EV battery management systems

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