Mersen GSB1/8 - 250V Fast Acting Glass 5mm x 20mm 250 Volts 0.125 Amps GSB series.
Mersen

GSB1/8

Alternate Item Number: 782001764746

UPC: 782001764746

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Minimum Qty: 5

Multiplier: 5

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Overview

The **Mersen GSB1/8** is a high-performance **250V fast-acting glass fuse** designed to deliver precise overcurrent protection in a wide range of industrial and electronic applications. Part of Mersen’s trusted **GSB series**, this compact **5mm x 20mm fuse** is rated for **250 volts** and **0.125 amps**, making it an ideal choice for sensitive circuits requiring rapid fault response. Engineered with a durable glass body, the GSB1/8 ensures consistent performance under demanding conditions while meeting stringent safety and reliability standards. ### **Key Features & Benefits** - **Fast-Acting Response**: Designed for rapid interruption of overcurrent conditions, the GSB1/25 minimizes downtime and prevents damage to critical components in power supplies, control systems, and instrumentation. - **Compact & Versatile**: With a **5mm x 20mm** form factor, this fuse fits seamlessly into standard fuse holders, making it suitable for space-constrained industrial panels, test equipment, and consumer electronics. - **High Voltage Rating**: Rated at **250V**, the GSB1/8 provides robust protection for low-to-medium voltage circuits, including PLCs, motor drives, and telecom systems. - **Glass Body Durability**: The robust glass construction resists corrosion, thermal shock, and mechanical stress, ensuring long-term reliability in harsh environments. - **Precision Current Rating**: At **0.125A**, this fuse is ideal for protecting low-power circuits where even slight overcurrents can lead to component failure or safety hazards. ### **Typical Applications** The **Mersen GSB1/8** is widely used across multiple industries where precise overcurrent protection is critical: - **Industrial Automation**: Protects control circuits in PLCs, sensors, and actuators from transient surges. - **Power Supplies**: Safeguards sensitive electronics in switching power supplies, UPS systems, and battery chargers. - **Telecommunications**: Ensures reliability in network equipment, routers, and fiber optic systems. - **Consumer Electronics**: Used in audio/video equipment, test instruments, and small appliances where compact size and fast response are essential. - **Automotive & Aerospace**: Provides protection in low-voltage control systems and instrumentation panels. ### **Why Choose Mersen?** Mersen is a global leader in **fuse technology**, with decades of expertise in designing high-reliability protection solutions for industrial and electronic applications. The **GSB series** is trusted by engineers worldwide for its **consistent performance, strict adherence to safety standards (UL, IEC, VDE), and compatibility with industry-standard fuse holders**. Whether you’re designing a new system or replacing an existing fuse, the **GSB1/8** delivers the dependability you expect from a market leader. ### **Installation & Selection Considerations** When selecting a fuse for your application, consider the following: - **Current Rating**: Ensure the fuse’s amp rating (0.125A) matches your circuit’s maximum continuous current. - **Voltage Rating**: The **250V rating** makes this fuse suitable for low-to-medium voltage systems, but always verify compatibility with your power source. - **Response Time**: Fast-acting fuses like the GSB1/8 are ideal for protecting sensitive components but may not suit applications requiring slow-blow characteristics. - **Environmental Conditions**: The glass body performs well in moderate temperatures, but extreme heat or vibration may require specialized alternatives. - **Certifications**: The GSB1/8 meets **UL 248, IEC 60127, and VDE standards**, ensuring compliance with global safety regulations. For engineers and technicians seeking a **reliable, high-quality fuse** that balances performance, durability, and compliance, the **Mersen GSB1/8** is an excellent choice. Its proven design, compact footprint, and fast-acting response make it a go-to solution for critical protection needs across industries.
  • 250V fast-acting glass fuse for precise overcurrent protection
  • Compact 5mm x 20mm design fits standard fuse holders
  • 0.125A rating ideal for low-power sensitive circuits
  • Glass body ensures durability and thermal resistance
  • UL, IEC, and VDE certified for global compliance

Specifications

Amperage Rating
0.125 A
Application
Electronic circuits
Brand Name
Ferraz Shawmut
Connection
Ferrule
Current Rating
0.125 A
Interrupt Rating
0.035 kA
Material
Glass
Mounting
Clip
Series
GSB
Size
5mm x 20mm
Special Features
Glass Body Fast Acting 5mm x 20mm GSB-V fuses have 1-1/2" wire lead each end.
Standard
UL Recognized, 250VAC, 1/32 - 10A. CSA Recognized, 250VAC, 1/32 - 10A. SEMKO Approved, 250VAC, 1/32 - 6-3/10. BSI Approved, 250VAC, 4/10 - 6-3/10A. VDE Approved, 250VAC, 5/100 - 6-3/10A, IEC 127-2 Sheet 2
Type
5 X 20 mm miniature fuses
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
0.787 IN x 0.2 IN x 0.2 IN
Package Dimensions (L x W x H)
19.9898 mm x 5.08 mm x 5.08 mm
Package Weight (Imperial)
0.005 L
Package Weight (Metric)
0.002 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.