

A3T25
Mersen A3T25 Fuse Amp-Trap® 300V 25-Amp Fast-Acting Class T A3T Series
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Pairs well with
APPROVALS & STANDARDS
- UL listed to standard 248-15 File E2137
- CSA certified to standard C22.2 no. 248.15
- DC listed to UL standard 248
KEY FEATURES & BENEFITS
Fast-acting A3T Class T fuses combine two highly desirable features - high current-limitation and a small physical size. Their unique dimensions prevent the substitution of other fuses with lower voltage ratings or current-limiting capability. These fuses have glass melamine bodies for superior dimensional stability and catalog numbers stamped into the blades for permanent identification.
- Extremely current-limiting for low peak let-thru current
- Unique dimensions prevent replacement by other fuse classes
- Blade-stamped catalog numbers for permanent identification
- Small physical size for greater design flexibility
APPLICATIONS
- Load centers
- Panelboards
- Switchboards
- Circuit breakers
- Metering centers
DOCUMENTS & RESOURCES
DATASHEET
DRAWINGS
CURVES
COMPLIANCE
SPECIFICATIONS
- Item Number: A3T800
- Item Description (ERP): 300V 800A T FUSE
- Short Description: Fuse Amp-Trap® 300V 800A Fast-Acting Class T A3T Series
- EAN/UPC Code: 782001890810
- Rated voltage AC UL: 300 V
- Rated voltage DC UL: 160 V
- Ampere Rating: 800 A
- ROHS Compliant: Yes
- Fuse Class: Class T
- Speed/Characteristic: Fast-Acting
- Mounting: Bolted
- AC Max I.R./Breaking Capacity: 200 kA
- Connection/Terminal Material: Copper
- Connection/Terminal Type: Blade
- Body/Insulating Material: GMG
- Product Diameter: 52.8 mm
- Product Length: 85.9 mm
- Product Weight: 0.4082 kg
- A3T- Mersen
- JJN - Bussman
- JLLN - Little Fuse
- TJN - Edison

Mersen A3T25 Fuse Amp-Trap® 300V 25-Amp Fast-Acting Class T A3T Series
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
Orders placed before 12:00 PM (PST) ship the same day or within 2 business days, with tracking provided within 72 hours. Learn more in our Shipping Policy.
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Returns & Exchanges
Non-defective items may be returned within 30 days with a 30% restocking fee. Shipping costs are non-refundable, and return shipping is the customer’s responsibility. See our full Return Policy.
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Cancellations
Orders can be canceled before shipment; if already shipped, standard return fees apply. Learn more about Cancellations.
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Damaged Shipments & Shortages
Report any shortages, damages, or incorrect items within 5 business days of delivery. For assistance, visit our Claims Policy.
What People Are Saying
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Order was processed and shipped quickly. Order arrived in sturdy box with plenty of cushion to insure against damage. Questions were answered as soon as possible. Look forward to working with Sonic again on future orders
— Peter Hoffman
I placed an order with Sonic Electric and after receiving needed to return the items. I was so pleased to get prompt personalized attention and a full refund. So nice to do business with a customer oriented company.
— Cindy Ward
I recently ordered two pop-up outlets for a kitchen island. One of them won't stay closed. I emailed customer service, and after a couple of email exchanges and a photo, they are shipping a replacement. Things like this can be an absolute hassle, but they were great. I would not hesitate to order from them again.
— Kathleen Snell
Great price, excellent service.
— Jose Mendoza
Great products, prices and service.
— George Moskoff
Items arrived quick. Just what I needed!
— Noma Woudenberg
Accurate and fast
— Paul Spurgeon
Great products, great pricing, delivered exactly as promised, on time. Would definitely buy from again.
— David Pool
Handled all of my lighting for my store. Beautiful work. Highly recommend!
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