Stinger SPF5140 5 Pack Shoc-Krome 40 AMP AGU Fuses

Chrome-finish AGU glass fuses in 5-pack—delivers reliable 40-amp overcurrent protection for car audio amplifiers, power distribution, and 12V accessories.

Product Overview

The Stinger SPF5140 is a 5-pack of 40-amp AGU (Audio Glass Fuse) glass fuses designed for protecting car audio amplifiers, power distribution blocks, and high-current 12V accessories from overcurrent damage and electrical fires. AGU fuses feature glass bodies with visible filament elements—allowing visual verification of blown fuses without requiring multimeter testing. The chrome-plated metal end caps provide corrosion resistance and secure contact in AGU fuse holders commonly used in car audio installations, dual-battery systems, and custom automotive electrical applications. The 40-amp rating suits mid-power car audio amplifiers (typically 400-800 watts RMS), auxiliary lighting circuits, or accessory power distribution where overcurrent protection prevents cable overheating and component damage. Sold in convenient 5-packs, the SPF5140 provides spare fuses for initial installations, replacements after fault events, or workshop inventory for installers handling multiple audio system builds. Compatible with standard AGU fuse holders used in car audio wiring kits, inline fuse holders, and distribution blocks requiring AGU-style overcurrent protection.

Key Specifications

• Product: AGU glass fuses (5-pack)
• Part number: SPF5140
• Brand: Stinger
• Fuse type: AGU (Audio Glass Fuse)
• Current rating: 40 amps
• Voltage rating: 12V DC nominal (automotive/marine)
• Fuse element: Glass body with visible wire filament
• End caps: Chrome-plated metal
• Dimensions: Standard AGU size (approximately 32mm L × 10mm diameter)
• Finish: Chrome (Shoc-Krome)
• Package quantity: 5 fuses
• Application: Car audio amplifiers, power distribution, 12V accessories
• Breaking capacity: Not specified (typical automotive fuses)
• Response time: Fast-blow (typical for AGU automotive fuses)

Features & Benefits

40 Amp Rating for Mid-Power Audio Systems
Provides overcurrent protection for car audio amplifiers drawing up to 40 amps continuous—typically suits amplifiers rated 400-800 watts RMS, mid-sized subwoofer systems, or multi-channel amplifiers powering door speakers and subwoofers. Prevents cable overheating, amplifier damage, and electrical fires from short circuits or component failures.

AGU Glass Fuse Design with Visible Element
Glass body construction allows visual inspection of fuse status—blown fuses show a broken or discoloured filament visible through the clear glass, eliminating the need for multimeter testing. Speeds troubleshooting during audio system commissioning or fault diagnosis in mobile installations where test equipment access is limited.

Chrome-Plated Metal End Caps
Shoc-Krome chrome plating on metal end caps resists corrosion from moisture, road salt, and under-hood heat exposure—maintains reliable electrical contact in AGU fuse holders installed in engine bays, under seats, or cargo areas. The corrosion resistance extends service life compared to bare brass or tin-plated alternatives that oxidise in Australian coastal or tropical environments.

Standard AGU Size for Universal Compatibility
Fits all standard AGU fuse holders used in car audio installations—includes inline fuse holders positioned near battery connections, distribution block fuse positions, and amplifier wiring kit fuse holders. Universal sizing ensures compatibility with Stinger, Rockford Fosgate, Kicker, and other manufacturers' AGU-compatible fuse holders.

Convenient 5-Pack for Spares and Replacements
Sold in 5-packs rather than singles—provides immediate spare fuses for installations where fuse access requires significant disassembly, replacements after blown fuses from installation errors, or workshop inventory for installers managing multiple audio system builds. Cost-effective compared to purchasing individual fuses for each replacement.

Fast-Blow Protection
AGU fuses typically use fast-blow elements that open quickly during overcurrent events—provides rapid protection against short circuits or component failures before cables overheat or amplifiers suffer internal damage. Critical for preventing electrical fires in vehicle cabins where wiring routes through carpet, trim panels, or insulation materials.

Technical Specs

• Product: AGU glass fuses
• Part number: SPF5140
• Manufacturer: Stinger
• Fuse type: AGU (Audio Glass Fuse)
• Current rating: 40A (amperes)
• Voltage rating: 12V DC nominal (automotive applications)
• Breaking capacity: Not specified (typical automotive-grade)
• Response characteristic: Fast-blow (expected for AGU automotive fuses)
• Body material: Glass (transparent)
• End cap material: Metal (chrome-plated)
• Finish: Chrome (Shoc-Krome plating)
• Filament visibility: Yes (visible through glass body)
• Dimensions: Standard AGU (approximately 32 mm L × 10 mm diameter)
• Operating temperature: Not specified (automotive-rated expected)
• Package quantity: 5 fuses
• Application: Car audio amplifiers, power distribution blocks, 12V accessories
• Fuse holder compatibility: Standard AGU fuse holders
• Standards compliance: Not specified (typical automotive fuse standards)

Compatible With / Goes Well With

Car Audio Applications (40A):

• Mid-power car audio amplifiers (400-800W RMS)
• Monoblock subwoofer amplifiers (single-channel bass amps)
• Multi-channel amplifiers (4-channel or 5-channel systems)
• Active subwoofer enclosures with built-in amplifiers
• Power distribution blocks feeding multiple amplifiers

12V Accessory Applications:

• Auxiliary LED light bars (up to 480 watts @ 12V)
• Inverters and DC-DC converters (up to 480W)
• Air compressors and tyre inflators
• Winch controllers (verify current requirements)
• Dual-battery isolator systems

Fuse Holders (AGU-Compatible):

• Stinger AGU inline fuse holders
• Rockford Fosgate AGU fuse holders
• Kicker AGU fuse holders
• Universal AGU fuse holder blocks
• Distribution block AGU fuse positions

Complementary Products:

• AGU fuse holders (inline or panel-mount)
• Amplifier wiring kits (4-gauge, 8-gauge with AGU holders)
• Power distribution blocks
• Battery terminals with fuse positions
• Heat-shrink ring terminals (for cable connections)

Note: Verify amplifier or accessory current draw does not exceed 40 amps continuous. For higher-power systems, use 60A, 80A, or larger fuses. Never install a fuse rated higher than the cable's ampacity—this defeats overcurrent protection and creates fire risk.

Frequently Asked Questions

What size amplifier can I protect with a 40 amp fuse?

A 40-amp fuse suits car audio amplifiers drawing up to 40 amps continuous current—typically amplifiers rated 400-800 watts RMS at 12V (allowing for amplifier efficiency losses). For single-channel subwoofer amps or multi-channel systems, check the amplifier's manual for recommended fuse size. Never use a fuse rated lower than the amplifier's peak current draw, but also never oversize fuses beyond cable capacity.

Can I use these fuses for applications other than car audio?

Yes, AGU fuses protect any 12V DC circuit drawing up to 40 amps—includes auxiliary lighting, inverters, air compressors, or other accessories. However, AGU fuses are fast-blow types designed for steady-state loads. For motor-starting applications (winches, compressors with high inrush current), consider slow-blow fuses that tolerate brief current surges without nuisance tripping.

How do I know if an AGU fuse is blown?

AGU fuses have transparent glass bodies—hold the fuse up to light and inspect the internal wire filament. A blown fuse shows a broken or discoloured (blackened) filament, often with visible gap in the wire. Intact fuses show an unbroken metallic wire spanning the length of the fuse body. This visual inspection eliminates the need for multimeter continuity testing.

What's the difference between AGU and ANL fuses?

AGU fuses are glass-body fuses with screw-on metal end caps, typically used for currents up to 80 amps in car audio and accessories. ANL fuses are larger blade-style fuses for higher currents (80-300+ amps), commonly used in marine, RV, and high-power car audio applications. AGU fuses fit inline holders and small distribution blocks; ANL fuses require larger dedicated fuse blocks. For 40-amp applications, AGU is appropriate.

Can I replace a blown 40A fuse with a 50A or 60A fuse temporarily?

No, never install a fuse rated higher than specified for the circuit. Oversized fuses defeat overcurrent protection—the cable or component may overheat and catch fire before the fuse blows. If a 40A fuse blows repeatedly, diagnose and repair the underlying fault (short circuit, overloaded amplifier, undersized cable) rather than installing a larger fuse. Always use the correct amperage rating.