Littelfuse FLM Series 250V/125VDC Time-Delay Midget Fuse

Littelfuse FLM Series 250V/125VDC Time-Delay Midget Fuse

The Littelfuse FLM Series is a line of time-delay (Slo-Blo/Time Lag) midget-style fuses rated 250VAC and 125VDC, engineered to protect control circuit transformers, solenoids, and other circuits that experience high inrush currents. Available in ampere ratings from 1A to 20A across 17 options, the FLM Series is housed in the compact Midget/5AG package size and carries a 10,000A interrupting rating at 250VAC, giving it the ride-through needed to absorb momentary current surges without nuisance opening. It is an excellent choice for supplemental protection of small motors in control panels, machine builds, and OEM equipment where dependable, precisely rated overcurrent protection is required. Electricians, panel shops, and maintenance technicians can select the correct FLM Series ampere rating as a like-for-like replacement when servicing equipment that specifies a time-delay midget fuse.

Key Features

• Ampere Rating Range: Available from 1A to 20A across 17 ratings, sized for control circuit transformers, solenoids, and other high-inrush-current loads that need a fuse rated to hold through startup surges.
• Dual Voltage Rating: Rated 250VAC and 125VDC, giving specifiers flexibility across AC and DC control circuit applications without changing fuse families.
• Time-Delay Operation: Slo-Blo/Time Lag (T)/Time Delay opening characteristic rides through momentary inrush spikes at energization to prevent nuisance blowing during normal startup events.
• Interrupting Rating: 10,000A @ 250VAC interrupting rating for safe, reliable clearing of fault currents in the circuits it protects.
• Compact Package Size: Midget/5AG form factor fits standard midget fuse holders, fuse blocks, and control panel fuse terminals for straightforward installation and replacement.
• Supplemental Motor Protection: Excellent for supplemental protection of small motors; for motor branch-circuit protection, Littelfuse recommends Class CC fuses instead of the FLM Series.

Technical Specifications

• Series: FLM
• VAC (V): 250
• VDC (V): 125
• Interrupting Rating: 10,000A @ 250VAC
• Ampere Rating Range: 1A - 20A (17 options)

Typical Applications

• Control Circuit Transformers
• Solenoid Circuits
• High Inrush Current Circuits
• Supplemental Small Motor Protection
• Industrial Control Panels and Machine Builds
• OEM Equipment Requiring Time-Delay Overcurrent Protection

Why Littelfuse?

Littelfuse engineers the FLM Series to deliver precise, time-delay overcurrent protection for control circuits that see momentary inrush at startup, backing the series with a clearly defined 250VAC/125VDC voltage rating and a 10,000A interrupting rating for dependable fault clearing across all 17 ampere ratings. The compact Midget/5AG package keeps installation straightforward in existing fuse holders and blocks, while the 1A to 20A rating range covers control transformers, solenoids, and small motor circuits. Choosing the correctly rated Littelfuse FLM Series fuse helps electrical professionals keep control circuits protected while supporting reliable, code-aware electrical design across commercial and industrial installations.