Restore Precision: The Essential Fuse for Your Multimeter’s mA/µA Functions

Has your multimeter’s milliamp or microamp range stopped working, showing an error, or displaying zero? This almost always indicates a blown 500mA (0.5A) protection fuse. Unlike the more common 10A/11A fuse, this specialized low-current fuse is critical for the accuracy and safety of your meter’s most sensitive circuits. Our FF500mA fuse is manufactured to the exact original specifications, ensuring your tool regains full functionality and safe operation.

Why the 500mA Fuse is Unique and Indispensable:

Guards Precision Pathways: The mA and µA current jacks connect to high-precision, low-power resistors (shunts) inside your meter. A 500mA fast-acting fuse is calibrated to protect these delicate components from even slight overloads, which a standard 10A fuse would completely ignore, leading to permanent damage.

Ensures Accurate Readings: The fuse’s specific resistance and reaction time are factored into the meter’s design. Using an incorrect fuse can lead to inaccurate current measurements, compromising the integrity of your work, whether it’s circuit design, troubleshooting, or calibration.

A Safety Must for Low-Current Work: When measuring current in low-power circuits (e.g., embedded systems, sensors, battery packs), using a meter with a missing or overrated fuse means you have no protection. A fault could damage not only your meter but also the device under test.

Product Specifications & Features:

Parameter Specification

Fuse Type / Rating： FF500mA, 500mA (0.5A) 600V DC, Fast-Acting

Dimensions (D x L)： 6.3mm x 32mm (0.25" x 1.26")

Body Material： Ceramic Tube

End Cap Material Nickel-Plated Brass

Key Protection： Low-Current (mA/µA) Input Circuits

Package Quantity ： 6 Fuses

⚠️ VITAL SAFETY & INSTALLATION WARNING:

Replacing an internal fuse requires care. If unsure, refer to your manual or consult a professional.

COMPLETE POWER DOWN: Remove all test leads, turn the meter OFF, and take out all batteries.

LOCATE THE CORRECT FUSE: Open the fuse compartment per your manual. The 500mA fuse typically protects the low-current (mA/µA) input jack, which is separate from the high-current (10A) jack fuse.

CRITICAL – VERIFY THE RATING: Examine your old fuse. It MUST read 500mA (or 0.5A) and likely 600V. NEVER, under any circumstances, replace it with a fuse of a higher amperage (e.g., 1A, 10A). This is a major safety violation.

INSTALL & TEST: Carefully insert the new FF500mA fuse. Reassemble, then test the meter’s continuity function or a low-voltage measurement to verify basic operation.

Who Needs This Specific Fuse?

Electronics Technicians & Engineers: Working on PCB repairs, embedded systems, or any project requiring precise low-current measurement.

Automotive & HVAC Technicians: Diagnosing sensor circuits or control modules that operate in the milliamp range.

Laboratory Researchers & Students: Conducting experiments where measurement accuracy in the mA/µA range is critical.

Any Multimeter Owner: Whose mA or µA functions have suddenly stopped working – this is your first and most likely fix.