Blue Sea 5209 AGC® Glass Tube Fuse, 4A, 5/pk
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Blue Sea 5209 AGC® glass tube fuse (4A), 5-pack—fast-acting and designed with corrosion-resistant construction for reliable DC circuit protection.
Key Features
- Fast-acting AGC® glass tube fuse for circuit protection
- Corrosion resistant design
- Visible indication of blown condition
- AGC® fuse format compatible with Blue Sea ST glass fuse blocks and AGC®/MDL® fuse holders
Intended Use
- Marine DC systems (AGC® fuses are typically used in DC systems up to 32V DC)
- Boat and RV electrical distribution using ST Glass Fuse Blocks and AGC®/MDL® fuse holders
Product Details
- Blue Sea Systems part number: 5209
- Fuse type: AGC® glass tube fuse
- Amperage: 4A
- Pack quantity: 5/pk
- Physical size: 1/4" x 1-1/4"
- Visible indication of blown condition
- Maximum voltage ratings (per manufacturer specifications): 250V AC and 32V DC
Parts Desk Insights
Best Use Case: Keep a 5-pack of the correct AGC® rating on hand for quick replacement in DC distribution circuits that use ST Glass Fuse Blocks and AGC®/MDL® fuse holders.
Common Issues: If a fuse blows repeatedly, don’t just replace it—inspect the connected circuit for the root cause (short, overload, reversed wiring, or component failure) and verify the fuse rating matches the circuit protection requirements. Also confirm the fuse style matches the AGC® glass tube format for the specific holder/block you’re using.
Related Products & Accessories
- Blue Sea Systems AGC® fuses (other amp ratings) - Browse the Fuse category for matching AGC® ratings.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.