Minebea NMB-MAT Fan 1608KL-05W-B39 1608KL05WB39 16O8KL-O5W-B39

1608KL-05W-B39 | NMB Minebea 40mm DC Fan — 24V / 7.4 CFM / 6500 RPM / 25.5 dB / 3-Wire / FANUC A90L-0001-0510

NMB 40mm FANUC Fan — Same Body, Different Connector from B59

The 1608KL-05W-B39 is NMB's 40×40×20mm DC axial fan sharing its core specifications with the 1608KL-05W-B59 — the same fan body, same 24V supply, same 6500 RPM speed, same 7.4 CFM airflow, and same 3-wire locked rotor sensor output. The difference is the connector: the B39 suffix identifies a different connector housing at the fan's wire termination compared to the B59 suffix variant.

This connector distinction determines which FANUC assembly number the fan is compatible with: the 1608KL-05W-B39 maps to FANUC A90L-0001-0510, while the 1608KL-05W-B59 maps to A90L-0001-0528. Both serve 40mm cooling positions in FANUC CNC equipment — different module types require the specific matching connector.

Key Specifications

B39 Connector vs B59 Connector — How to Tell Them Apart

The B-suffix in NMB's fan naming identifies the connector and wire assembly configuration — specifically the connector housing type and wire length:

B39 connector: The B39 variant uses a connector format compatible with FANUC A90L-0001-0510 fan assemblies — the specific housing mates with the fan connector socket on the corresponding FANUC module.

B59 connector: The B59 variant uses a different connector housing, compatible with FANUC A90L-0001-0528 assemblies.

Both connectors physically hold 3 wires; both mate to 3-pin fan sockets. The difference is the housing geometry and latching mechanism — the two cannot be used interchangeably. Confirm which FANUC assembly number the failed fan carries from the module's label or service manual before ordering.

Applications

FANUC CNC module cooling: Direct replacement in FANUC CNC control assemblies and display units referencing A90L-0001-0510 — the same applications as the B59 variant but for modules requiring the B39 connector.

FANUC servo and drive module internal cooling: 40mm fans in compact servo drive and CNC interface cards — the small form factor cools specific PCB positions and heat-generating components at close range.

Industrial electronics enclosures: 24V powered compact fan positions in automation controllers, power supply boards, and embedded control electronics where 40mm is the available mounting format.

FAQ

Q1: How do I confirm whether my FANUC module requires 1608KL-05W-B39 (B39) or 1608KL-05W-B59 (B59)?

Check the FANUC assembly number on the failing fan's label or the module's fan assembly documentation: A90L-0001-0510 requires B39; A90L-0001-0528 requires B59. If the fan label is unreadable, confirm from the specific module's FANUC spare parts manual or maintenance documentation which assembly number is specified.

Q2: What is the practical difference in performance between 1608KL-05W-B39 and 1608KL-05W-B59?

None — both fans have identical electrical specifications: 24V DC, 7.4 CFM, 6500 RPM, 25.5 dB(A), 42.2 Pa, 50,000-hour life, 3-wire locked rotor sensor. The B39 and B59 designations indicate connector type only. The cooling performance from either variant is identical; only the connector interface differs.

Q3: Does the 1608KL-05W-B39 have auto-restart protection?

NMB's locked rotor protection in the 1608KL series prevents motor burnout when the fan is blocked but does not auto-restart — the fan requires the stall condition to be cleared (blockage removed) and the supply voltage to be cycled for a restart. In FANUC systems, the module protection circuitry typically powers down the fan supply on detecting a stall alarm, then restarts on the next power cycle. Confirm the specific FANUC module's fan power management behaviour from the module's service manual.

Q4: What maintenance interval is recommended for 1608KL-05W-B39 in FANUC CNC service?

FANUC generally recommends periodic fan inspection and replacement at regular maintenance intervals — typically 3–5 years or 20,000–30,000 operating hours, depending on the specific module and operating environment. Dusty or oil-contaminated environments accelerate bearing wear and bearing seal contamination, shortening service life below the 50,000-hour L10 specification. Annual compressed-air cleaning of accessible fan surfaces (with equipment powered down) extends service life by reducing thermal loading from dust accumulation.