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Mersen GW3 - 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 3 Amps GW series.

Mersen GW3 Mersen plug fuses are intended for industrial and residential applications. Non…

Alternate Item Number: 068938793302

UPC: 068938793302

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Specification Sheet

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Overview

The Mersen GW3 (SKU: GW3) is a non-time-delay plug fuse designed for precise overcurrent protection in 125V AC electrical systems. Rated at 3A, this Edison base fuse belongs to Mersen's GW series, optimized for receptacle and lighting circuits where immediate fault current interruption is critical. Its low melting-point temperature element ensures rapid response during overloads or short circuits, safeguarding sensitive equipment and wiring from damage. For Canadian installations, the GW3 functions as a Type P fuse, meeting CSA and UL requirements for non-motor loads. This fuse features a tamper-resistant design, preventing the installation of incorrect amperage ratings and reducing the risk of overfusing. The GW3 is part of Mersen's comprehensive plug fuse lineup, which includes non-time-delay options for lighting circuits, time-delay models for motor loads, and specialized types for Canadian electrical standards. Key specifications include a 125V AC voltage rating, 3A current rating, and 10kA interrupting rating (IR) for AC applications. The GW3 is compatible with Edison base fuse holders and is available in a range of amperage ratings from 3A to 30A across Mersen's plug fuse series. For applications requiring tamper resistance, Mersen offers Type S plug fuses with rejection features, along with adaptors (e.g., SAG3-2/10) for Edison base compatibility. Mersen plug fuses are engineered for reliability in industrial and residential environments, providing consistent protection for lighting circuits, receptacles, and low-duty motor applications. The GW3's design prioritizes quick response times and thermal sensitivity, making it ideal for circuits where immediate fault interruption is essential to prevent equipment damage or fire hazards.
  • 125V AC voltage rating for industrial and residential applications
  • 3A current rating with non-time-delay response for lighting and receptacle circuits
  • Edison base compatibility for standard fuse holders
  • 10kA interrupting rating (IR) for AC applications
  • Tamper-resistant design prevents incorrect amperage installation
  • Part of Mersen's GW series with amperage ratings from 3A to 30A
  • Meets Canadian Type P requirements for non-motor loads

Specifications

Amperage Rating
3 A
Application
Industrial and residential;Receptacle and lighting circuits
Brand Name
Ferraz Shawmut
Class
Plug
Connection
Screw In
Family Code
145
Family Description
Plug Fuse W
Interrupt Rating
10 kA
Material
Screw In
Mounting
Screw In
Response Time
Fast-Acting
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
CSA;UL
Standard
UL Listed to Standard 248-11, File E76208; CSA Certified, Class 142301, File 15525
Type
Plug Fuse
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 3 Amps G series.

G3

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 3 Amps G series.
Littelfuse Plug fuses provide overcurrent protection to general purpose circuits and small motor loads. Edison-base Plug fuses (TOO and TLO series) feature metal threads similar to incandescent lamp bases. Type S Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and must be used with Type S adapters (SAO series). The National Electrical Code permits Edison base Plug fuses to be used for replacement purposes only. Type S fuses and adapters prevent shunting open fuses and over-fusing.

TOO020

Littelfuse Plug fuses provide overcurrent protection to general purpose circuits and small motor loads. Edison-base Plug fuses (TOO and TLO series) feature metal threads similar to incandescent lamp bases. Type S Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and must be used with Type S adapters (SAO series). The National Electrical Code permits Edison base Plug fuses to be used for replacement purposes only. Type S fuses and adapters prevent shunting open fuses and over-fusing.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 3.2 Amps SAG series.

SAG3-2/10

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 3.2 Amps SAG series.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 1 Amps SAG series.

SAG1

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 1 Amps SAG series.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 1.25 Amps SAG series.

SAG1-1/4

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 1.25 Amps SAG series.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 2 Amps SAG series.

SAG2

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 2 Amps SAG series.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 2.5 Amps SAG series.

SAG2-1/2

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1000 Volts 2.5 Amps SAG series.
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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 5 Amps SAG series.

SAG5

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 &quot,P&quot, fuse is used for non-motor loads and Type &quot,D&quot, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type &quot,S&quot, plug fuses are time-delay and tamper resistant. 1500 Volts 5 Amps SAG series.

Frequently Asked Questions

What is the voltage rating for Mersen Plug Fuses?

The voltage rating for these fuses is 125VAC.

What is the amperage range for Mersen Plug Fuses?

The amperage range for these fuses is from 3 to 30A.

What is the interrupting rating (IR) for these fuses?

The interrupting rating (IR) for these fuses is 10kA I.R. AC.

What are the UL and CSA approval details for these fuses?

They are UL Listed Guide JEFV, File E76208 and CSA Certified Class 142301, File 15525.

What types of circuits are Mersen Plug Fuses suitable for?

Standard non-time delay fuses are for receptacle and lighting circuits, while standard time delay fuses are for motor loads.

What are Type 'P' and Type 'D' fuses used for in Canada?

Type 'P' fuses are for non-motor loads, and Type 'D' fuses are for electric heating and cycling loads circuits.

What is the purpose of Type S plug fuse adaptors?

Type S adaptors screw into the Edison base and allow Type S fuses to be installed, preventing the wrong ampere size fuse from being used.

Are there specific fuses for cycling loads and motor circuits?

Yes, Low-Temp time delay plug fuses have thermal sensitivity and are suitable for cycling loads and motor circuits.

When must an SAG adaptor be used with a fuse?

An SAG adaptor must be used to fit an Edison base fuse holder for certain catalog numbers.

What are the amperage ranges for the SAG adaptors?

SAG adaptors are available for fuse ranges including 1-8/10 to 3-2/10A, 3-1/2 to 6-1/4A, 7 to 15A, 20A, and 25 to 30A.

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.