A06B-6073-K250 Sealed Lot Of New Fanuc FUSE A60L00010290/LM32C New Original

48VAC/DC, 50A Interrupt Rating, Clear Body, For FANUC Servo Drive Protection, 12.7×12.7×6.35mm

The FANUC A06B-6073-K250 is the 3.2A Daito LM32C plug-in fuse — a small but operationally critical component inside FANUC's servo drive and CNC control electronics. In FANUC servo amplifier modules, individual fuses protect specific internal circuits: DC bus sections, control card power rails, and braking resistor circuits are each guarded by appropriately rated plug-in fuses.

When a transient overcurrent event occurs — a motor stall, a wiring short, a component fault in the drive — the fuse opens faster than the upstream circuit breaker, isolating the affected circuit while the rest of the drive and the machine continue to function.

The LM32C designation comes from the Daito Communications Corporation fuse family, which has been specified in FANUC electronics for decades. The "L" prefix indicates a low-voltage, fast-blow ceramic type; "M32" denotes the 3.2A current rating; "C" identifies the plug-in package. FANUC cross-references this fuse under both its own part number (A06B-6073-K250) and the Daito catalogue reference (A60L-0001-0290/LM32C). When ordering or sourcing a replacement, both references confirm the correct part.

The plug-in body — a compact 2-pin form that seats directly into through-board or chassis-mount fuse sockets — allows field replacement without soldering or special tools. A technician with the FANUC maintenance manual, a multimeter, and a stock of common fuse values can replace a blown A06B-6073-K250 in minutes, returning a drive to service far faster than waiting for a drive board repair or replacement.

FANUC servo amplifier modules — the α-series SVM (Servo Amplifier Module), the β-series SVU, and the α*i-series servo amplifiers — contain multiple plug-in fuses on their control boards and power sections.

The exact fuse location and function depend on the specific amplifier model and board revision, as documented in the FANUC servo amplifier maintenance manual (B-65165EN for α-series and equivalent manuals for other series). In all cases, the fuse is specified by both its FANUC part number and its Daito equivalent — consulting the amplifier maintenance manual for the specific machine before ordering replacements is essential to confirm the correct fuse value and location.

The 3.2A/48V rating of the A06B-6073-K250 positions it as a control circuit fuse rather than a main power fuse. Control circuits in FANUC amplifiers typically operate at 24V DC or lower voltages with current draws in the 1-3A range; the 3.2A fuse provides protection with a margin above normal operating current while still opening quickly during a fault. Main power fuses within the same amplifier (protecting the three-phase AC input or the DC bus) are typically rated at much higher values and use different fuse formats.

CNC machine downtime is expensive by any measure — typically measured in hundreds to thousands of dollars per hour in lost production, late deliveries, and labour costs. A fuse that costs a few dollars can cause hours or days of downtime if a replacement is not immediately available.

The A06B-6073-K250 and the other common FANUC fuse values (LM20, LM32C, LM50C in both standard and rated variants) should form part of every FANUC CNC machine's on-site spare parts kit. Stocking 10 to 20 pieces of each commonly specified fuse value is inexpensive insurance against unexpected downtime.

The FANUC maintenance manual for each specific machine or drive model lists the fuse values used; this list defines the minimum spare fuse inventory that maintenance engineering should hold for each machine or machine type in the facility.