Mersen GT25 - Mersen plug fuses are intended for industrial and residential applications. Non time-delay fuses are available for receptacle and lighting circuits and time-delay fuses for motor loads. For Canadian requirements, a type P fuse is used for non-motor loads and Type D, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type S plug fuses are time-delay and tamper resistant. 125 Volts 15 Amps GP series. 125 Volts 25 Amps GT series.
Mersen

GT25

Alternate Item Number: 068938793272

UPC: 068938793272

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Overview

The Mersen GT25 (SKU: GT25) is a Type S plug fuse engineered for reliable overcurrent protection in industrial and residential electrical systems. Rated at 125V and 25A, this fuse is designed to safeguard circuits from damaging overloads and short circuits while handling temporary inrush currents common in motor loads and cyclical applications. Key specifications include a 10kA interrupting rating (I.R.) for AC circuits, ensuring robust protection against high fault currents. The GT25 features a time-delay design, allowing it to withstand transient surges during motor startups or equipment cycling without nuisance tripping. This makes it ideal for applications such as lighting circuits, receptacle circuits, and motor loads where temporary current spikes are expected. The tamper-resistant design of the GT25 prevents the insertion of incorrectly rated fuses, enhancing electrical safety and system reliability. This feature is critical in environments where unauthorized or incorrect fuse replacements could compromise system integrity or pose safety hazards. For Canadian applications, the GT25 meets Type D requirements for electrical heating and cyclical load circuits, featuring low melting-point temperature elements as specified by the Canadian Electrical Code. Constructed for versatility, the GT25 is suitable for both industrial and residential use, providing consistent performance and long-term protection for valuable electrical equipment. Its compact design and compatibility with standard plug fuse holders make it a practical choice for professionals seeking dependable circuit protection. Backed by Mersen’s reputation for quality and innovation, the GT25 is a trusted solution for critical applications requiring reliable overcurrent protection.
  • 125V voltage rating with 25A current rating for versatile circuit protection
  • Type S design with tamper-resistant features for enhanced safety
  • Time-delay operation to handle motor start-up currents and transient surges
  • 10kA interrupting rating (I.R.) for robust fault current protection
  • Meets Canadian Type D requirements for electrical heating and cyclical loads

Specifications

Amperage Rating
25 A
Application
Industrial and residential;Receptacle and lighting circuits
Brand Name
Ferraz Shawmut
Class
Plug
Connection
Screw In
Current Rating
25 A
Family Code
145
Family Description
Plug Fuse W
Interrupt Rating
10 kA
Material
Screw In
Mounting
Screw In
Response Time
Time-Delay
Series
GT
Size
1.126 x 1.29 Inches
Special Features
Available in both time-delay and non time-delay;For Canadian market, available in Type "P" and Type "D"
Standard
UL Listed to Standard 248-11, File E76208; CSA Certified, Class 142301, File 15525
Standard
CSA;UL
Type
Plug Fuse
Voltage Rating
125 V
Voltage Rating
125 VAC
Package Dimensions (L x W x H)
1.29 IN x 1.126 IN x 1.126 IN
Package Dimensions (L x W x H)
3.2766 cm x 2.86 cm x 2.86 cm
Package Weight (Imperial)
0.060 L
Package Weight (Metric)
0.027 kg
Mersen plug fuses are intended for industrial and residential applications. Non time-delay fuses are available for receptacle and lighting circuits and time-delay fuses for motor loads. For Canadian requirements, a type P fuse is used for non-motor loads and Type D, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type S plug fuses are time-delay and tamper resistant. 125 Volts 15 Amps GP series. 125 Volts 25 Amps GW series.

GW25

Mersen plug fuses are intended for industrial and residential applications. Non time-delay fuses are available for receptacle and lighting circuits and time-delay fuses for motor loads. For Canadian requirements, a type P fuse is used for non-motor loads and Type D, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type S plug fuses are time-delay and tamper resistant. 125 Volts 15 Amps GP series. 125 Volts 25 Amps GW series.
The National Electric Code now permits Edison-base fuses to be used only for replacements in existing installations, and then, only when there is no evidence of overfusing or tampering. All new Edison-based fuseholders must have Type S fuse adapters installed before they are placed in service. Designed to prevent installation of wrong size fuses, Type S Adapters (SAO series) screw into Edison-base fuseholders so they may accept Type S fuses. Once installed the adapters cannot be removed. To prevent shunting of open fuses or overfusing, and to reduce nuisance fuse opening, it is recommended that SAO adapters with properly rated SLO or SOO series fuses be installed in all Edison-base fuseholders.

SAO1.25

The National Electric Code now permits Edison-base fuses to be used only for replacements in existing installations, and then, only when there is no evidence of overfusing or tampering. All new Edison-based fuseholders must have Type S fuse adapters installed before they are placed in service. Designed to prevent installation of wrong size fuses, Type S Adapters (SAO series) screw into Edison-base fuseholders so they may accept Type S fuses. Once installed the adapters cannot be removed. To prevent shunting of open fuses or overfusing, and to reduce nuisance fuse opening, it is recommended that SAO adapters with properly rated SLO or SOO series fuses be installed in all Edison-base fuseholders.

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.