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Littelfuse 37211250511 TR5® 372 1.25 A 250 VAC Slo-Blo® / Time-Lag (T) Fuse – 0511 Bulk 1,000 pcs
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pLittelfuse 37211250511 — 1.25 A, 250 V, time-delay fuse, 35–63 A @ 250 VAC (rating-dependent); 50 A @ 125 VDC interrupting./p
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Littelfuse 37211250511 TR5® 372 1.25 A 250 VAC Slo-Blo® / Time-Lag (T) Fuse – 0511 Bulk 1,000 pcs
Littelfuse 37211250511 TR5® 372 1.25 A 250 VAC Slo-Blo® / Time-Lag (T) Fuse – 0511 Bulk 1,000 pcs belongs to the Littelfuse range. It carries 1.25 A, rated 250 VAC, uses a time-delay element.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / TR5® 372 |
| Part number | 37211250511 |
| Fuse characteristic | Slo-Blo® / Time-Lag (T) |
| Rated current | 1.25 A |
| Rated voltage | 250 VAC |
| Interrupting capability | 35–63 A @ 250 VAC (rating-dependent); 50 A @ 125 VDC |
| Package | TR5® radial lead fuse; 3.3 mm leads; Bulk |
| Mounting method | Through Hole, Radial |
| Dimensions | Ø8.5 mm × 8.0 mm max; lead Ø0.6 mm |
| Lead pitch | 5.08 mm |
| Operating temperature | -40°C to +85°C |
| Approvals | cRUus E67006; CE; UKCA; CCC; VDE; KC; PSE |
| Standards / compliance | UL/CSA/NMX 248-1 & 248-14; EN/J/K 60127-1 & 60127-3; GB/T 9364.1 & 9364.3; CE/UKCA |
| Environmental | RoHS; lead-free; halogen-free |
| Packaging / order code | 0511: Bulk, 1,000 pcs; 3.3 mm leads; lead length 3.3 mm |
| Product status | Verify current orderability with Littelfuse / authorized distribution |
Design Notes
- Interrupting capability is 35–63 A @ 250 VAC (rating-dependent); 50 A @ 125 VDC — confirm the circuit's prospective fault current stays below this.
- Time-delay element rides through motor starting and capacitive inrush without nuisance opening.
- Startup surges of several times rated current are tolerated for a short window.
- Working voltage must stay at or below 250 VAC; a lower-rated part is not a safe substitute.
- Do not upsize beyond 1.25 A to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- battery
- charger
Ordering Details
Order code 37211250511 from Littelfuse, supplied in TR5® radial lead fuse; 3.3 mm leads; Bulk. Confirm the exact suffix before release.
Common Questions
What are the ratings of the 37211250511?
1.25 A continuous at 250 VAC, interrupting rating 35–63 A @ 250 VAC (rating-dependent); 50 A @ 125 VDC.
Is the 37211250511 fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the 37211250511 be used on a higher fault-current circuit?
No — its interrupting rating is 35–63 A @ 250 VAC (rating-dependent); 50 A @ 125 VDC. Choose a part whose breaking capacity exceeds the prospective fault current.
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