Eaton gma-3-r 3A 250V Glass Fuse Fast-acting Gma Series

Product Description

The EATON gma-3-r is a fast-acting, cylindrical glass fuse rated at 3 amps and 250 volts AC, designed for protection of electronic circuits and sensitive low-power equipment. Part of the GMA Series, this fuse features a glass tube body with nickel-plated brass endcaps and a non-rejection, ferrule-end connection style. It measures 20mm in length by 5mm in diameter, fitting standard 20mm fuse blocks including the HTB series. The single-element, non-indicating design provides straightforward overcurrent protection without visual blown indicators. Electricians and electronics technicians working on instrumentation, control boards, and small electronic assemblies commonly specify this fuse type.

The gma-3-r is intended for electronic circuit protection in both residential and commercial applications where a compact 20mm fast-acting fuse is required. It carries an interrupt rating of 100 amps at 250 volts AC and 10 kA at 125 volts AC, and is also rated at 32 volts DC (self-certified), making it suitable for mixed AC/DC control panel environments. The GMA Series is cross-referenced as equivalent to Bussmann GMA, Littelfuse 235, and Mersen GGM series fuses, giving technicians flexibility when sourcing replacements.

Key Features

• Fast-acting response: opens at 135 percent rated current within 60 minutes, and at 200 percent within 2 minutes
• Glass tube body with nickel-plated brass endcaps for reliable contact and corrosion resistance
• Non-rejection, ferrule-end design fits standard 20mm fuse holders and HTB series fuse blocks
• Rated 250 volts AC and 32 volts DC, suitable for mixed AC/DC control circuits
• Non-indicating single-element construction for straightforward replacement
• Meets CE, CSA, PSE, and UL standards for broad application acceptance

Compatibility

Cross-referenced as equivalent to Bussmann GMA, Littelfuse 235 series, and Mersen GGM series fuses. Compatible with HTB series fuse block holders. Fits standard 20mm fuse holder clips and panel-mount fuse blocks designed for 5mm diameter fuses.

Installation Notes

Installation should be performed by a qualified electrician or electronics technician following applicable NEC guidelines and equipment manufacturer instructions. Always de-energize and lock out the circuit before replacing a fuse. Verify the replacement fuse amperage, voltage rating, and body size match the original specification before insertion. Do not substitute a higher-amperage fuse to restore power without first identifying and correcting the fault that caused the overcurrent condition.

Technical Specifications

• Amperage Rating: 3 amps
• Voltage Rating (AC): 250 volts AC
• Voltage Rating (DC): 32 volts DC (self-certified)
• Interrupt Rating: 100 amps at 250 volts AC; 10 kA at 125 volts AC
• Response Time: 60 minutes at 135 percent, 2 minutes at 200 percent
• Fuse Type: Fast-acting, single element
• Body Style: Cylindrical glass tube
• Body Material: Glass tube, nickel-plated brass endcaps
• Connection Type: Ferrule end x ferrule end
• Fuse Size: 20mm length x 5mm diameter
• Fuse Indicator: Non-indicating
• Application: Electronic circuits
• Compatible Fuse Block Series: HTB
• Standards: CE, CSA Certification Class 1422-01 (File 53787, File E19180), PSE Approval, UL Guide JDYX
• Equivalent Series: Bussmann GMA, Littelfuse 235, Mersen GGM

Standard Information

• Brand: EATON
• Manufacturer Part Number: gma-3-r