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Mersen Tri-Onic TRS-R Class RK5 Time-Delay Fuse, 600VAC/600VDC
Model: MER-TRS-1R
Mersen Tri-Onic TRS-R Class RK5 Time-Delay Fuse, 600VAC/600VDCThe Mersen Tri-Onic® TRS-R is a current-limiting, time-delay fuse in Class RK5, engineered for overcurrent protection of motors,...
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Mersen TRS-RDC Tri-Onic Series 300V RK5 Time-Delay Fuse
The Mersen TRS-RDC Tri-Onic Series is a 300V DC-rated, time-delay Class RK5 fuse family engineered for DC circuit protection in surface and underground mining applications. This family is available across a Motor FLA range from 0.15A to 10A, letting electrical professionals select the exact current rating needed for rail heaters, trailing cables, pump motors, and other mine-duty DC circuits. Every fuse in the TRS-RDC line shares a rugged glass melamine (GMG) body, tin-plated copper ferrule terminals, and MSHA approval, giving installers a consistent, code-compliant platform across the entire amperage lineup. The time-delay characteristic common to the whole series allows motor start-ups and high inrush loads to pass without nuisance opening, making it a dependable choice for the harshest mine-duty applications.
Key Features
- Time-Delay Characteristic: Rides through motor start-ups and high inrush loads without nuisance opening, a shared trait across the full 0.15A-10A Motor FLA range.
- Durable Construction: Rugged glass melamine (GMG) body for superior reliability in harsh mine environments.
- DC-Rated Performance: 300V rated voltage (UL) suited for mine duty and other long time-constant applications.
- Ferrule Terminals: Tin-plated copper terminals with clip mounting for secure, reliable connections.
- Compact Dimensions: 5 in product length and 0.81 in product diameter for standard fuse-holder compatibility across the series.
- Fuse Class: Class RK5 time-delay speed/characteristic for coordinated circuit protection.
- Selectable Motor FLA Range: Choose from 0.15A, 1A, or 10A ratings to match the exact load requirement of the circuit.
Certifications & Compliance
- MSHA Approval No. 28-26-0
- Meets severe third-party requirements for 600VDC-rated fuses
Technical Specifications
- Body/Insulating Material: GMG
- Rated Voltage DC (UL): 300 V
- Speed/Characteristic: Time Delay
- Motor FLA Options: 0.15A, 1A, 10A
- Sell Pack Quantity: 10 Each
- Sell Pack Length: 5.12 in
- Sell Pack Width: 4.12 in
- Sell Pack Height: 1.75 in
Typical Applications
- Rail Heaters
- Trailing Cables
- Mine Circuits
- Pump Motors
- Surface and Underground Mining Electrical Systems
Why Mersen?
Mersen's TRS-RDC Tri-Onic Series combines a rugged glass melamine body with MSHA-approved, DC-rated performance to deliver dependable time-delay protection across a full range of Motor FLA ratings for the harshest mine-duty circuits. The tin-plated copper ferrule terminals and Class RK5 time-delay design give electrical professionals a coordinated, code-compliant solution for motor start-ups and high inrush loads, whatever amperage the application demands. Choose Mersen for reliable, industry-tested fuse protection built for demanding DC applications.
"Manufacturer Resources
Mersen Product Catalog
Product Specs
- Connection Terminal Type:
- Ferrule
- Product Length:
- 5 in
- Sell Pack Width:
- 4.12 in
- Mounting Method:
- Clip
- Connection/Terminal Material:
- Tin-Plated Copper
- Sell Pack Length:
- 5.12 in
- Sell Pack Quantity:
- 10 Each
- Speed/Characteristic:
- Time Delay
- Product Diameter:
- 0.81 in
- Sell Pack Height:
- 1.75 in
- Rated voltage DC UL:
- 300 V
- Fuse Class:
- Class RK5
- Body/Insulating Material:
- GMG
- list_batch:
- MERSEN-20260825
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Time-Delay Fuse
- Product Material:
- GMG
- Voltage Rating:
- 300V
- Listing:
- MSHA Approved
- Product Subgroup:
- Fuses
Mersen TRS10RDC – Frequently Asked Questions
1) Will the Mersen TRS-RDC fuse fit a standard Class R fuse clip holder?
The TRS-RDC is a Class RK5 ferrule fuse measuring 5 inches long by 0.81 inch diameter, with tin-plated copper ferrule terminals and clip mounting. That is the standard 250V-class R dimensional envelope for a ferrule-style Class R fuse, so it drops into clip holders built for that size. Because it is a Class R body it also carries the rejection feature, meaning it will seat in a Class R rejection holder while a plain Class H/K fuse will not.
2) Is the Mersen TRS-RDC rated for DC circuits or AC?
It is a DC fuse. The rated voltage is 300 V DC (UL), and the series is built for mine-duty DC circuits with long time constants, including rail heaters, trailing cables, pump motors and other mine circuits. Do not substitute it where an AC voltage rating is what the drawing calls for.
3) Is the Mersen TRS-RDC MSHA approved for underground mining?
Yes. The TRS-RDC Tri-Onic fuse carries MSHA approval, listed under approval number 28-26-0, and the series is intended for both surface and underground mining electrical systems.
4) What amp ratings does the TRS-RDC come in, and what do I need to specify when ordering?
Three ratings are offered: 0.15A (part TRS15/100RDC), 1A (TRS1RDC) and 10A (TRS10RDC). The amp rating is the only choice to make, since body material, voltage, class and dimensions are the same across all three. Fuses sell in packs of 10 each.
5) Can I use a Littelfuse BLF midget fuse in place of a Mersen TRS1RDC?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body. Two things rule it out as a swap for the TRS1RDC: it is fast-acting rather than time delay, so it will not ride through motor start-up inrush the way the Tri-Onic RK5 time-delay element does, and a midget body is physically much smaller than the TRS-RDC's 5 in by 0.81 in ferrule body that mounts in RK5 clips. If the circuit is a pump motor or trailing cable that sees inrush, stay with the time-delay Tri-Onic.
6) Will a time-delay fuse like this hold on motor inrush, or should I use a fast-acting fuse?
The TRS-RDC is a time-delay fuse, so it rides through motor starting current and other high inrush loads without nuisance opening. That is what you want on pump motors and similar inductive DC loads. If you are protecting a circuit with no inrush where you want the fastest possible clearing instead, a fast-acting midget fuse such as the Littelfuse BLF Series (250V) is the other side of that choice.
7) What is the difference between a Mersen Tri-Onic TRS-RDC fuse and a Littelfuse AGU or AGA glass fuse?
They serve different circuits. The Littelfuse AGU is an AG-series glass tube fuse and the Littelfuse AGA5 is a 5A AGA-series glass fuse - small glass-bodied automotive and appliance style fuses. The Mersen TRS-RDC Tri-Onic is a Class RK5 time-delay fuse in a glass melamine (GMG) body with tin-plated copper ferrule terminals, clip mounted, 5 in long, and rated 300 V DC (UL) with MSHA approval. For mine-duty DC feeders, rail heaters, trailing cables, and pump motors, the RK5 Tri-Onic is the device that matches the holder and the application; the AG-style glass fuses are for small low-current branch loads.
8) I need a low-amp fuse for a metering circuit - should I order a Mersen TRS15/100RDC or the Square D PowerLogic fuse pack?
Match the device to the panel. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended for metering inputs on PowerLogic equipment. The Mersen TRS15/100RDC is the 0.15A Motor FLA member of the Tri-Onic TRS-RDC family, a Class RK5 time-delay fuse rated 300 V DC (UL) in a 5 in by 0.81 in GMG ferrule body with clip mounting and MSHA approval. If you are fusing a PowerLogic meter, order the Square D pack; if you are protecting a low-current DC mine-duty circuit in RK5 clips, order the TRS15/100RDC.
9) Why does the TRS-RDC use a glass melamine body instead of a fiber or glass tube?
The body and insulating material is GMG (glass melamine), chosen for mechanical and thermal durability in harsh mine environments. That is a step up from the glass tube construction used on small automotive and appliance fuses like the Littelfuse AGA and AGU series, which are not built for that duty.
10) How many Mersen TRS-RDC fuses come in a pack, and what size is the carton?
They ship 10 each per sell pack, in a box measuring 5.12 by 4.12 by 1.75 inches. Worth knowing if you are stocking a mine MRO crib and want spares on the shelf for each amp rating.
11) Are the terminals on the Mersen TRS-RDC copper, and will they corrode in a damp underground installation?
The ferrule terminals are tin-plated copper. The tin plating is what keeps the contact surface from oxidizing in the clips, which matters in wet underground and trailing cable work where a high-resistance connection is the usual failure point.
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Does the Mersen TRS10RDC come with a warranty?
Absolutely. The Mersen TRS10RDC is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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