Mersen TRS-R Class RK5 Time-De...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$25.57
Mersen TRS-R Class RK5 Time-Delay Fuse, 600VAC/600VDC

Mersen TRS-R Class RK5 Time-Delay Fuse, 600VAC/600VDC

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Model: TRS3-1/2R

In Stock (leaves warehouse same day if ordered before 3pm ET)

$25.57
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Mersen TRS15R Class RK5 Time-Delay Fuse, 15A 600VAC/300VDC Ferrule Terminal

The Mersen TRS15R is a Class RK5 time-delay fuse rated 15A with dual voltage capability of 600VAC/300VDC, engineered for reliable overcurrent protection in demanding electrical systems. Built with a PolyTube insulating body and copper ferrule terminals, this fuse delivers an exceptional 200 kA breaking capacity for high fault-current environments. Its time-delay characteristic allows it to ride through temporary inrush and motor starting currents while still responding quickly to true fault conditions, making it a dependable choice for professional electrical protection.

Key Features

  • 15A Ampere Rating: Provides precise current protection for medium-load circuits and equipment protection applications.
  • Class RK5 Design: Delivers current-limiting performance with time-delay characteristics for motor and inductive load compatibility.
  • Dual Voltage Rating: 600VAC/300VDC capability offers versatility for both AC and DC circuit protection requirements.
  • 200 kA Breaking Capacity: Exceptional fault current interruption capability ensures reliable protection in high-fault current environments.
  • Ferrule Terminal Construction: Copper ferrule terminals provide secure connections and optimal conductivity for professional installations.
  • PolyTube Insulating Material: Advanced body construction delivers superior insulation and mechanical protection in demanding environments.
  • Time-Delay Characteristics: Allows temporary overloads while providing fast response to fault conditions for optimal equipment protection.
  • Clip Mounting: 5-inch length with clip mounting method ensures compatibility with standard fuse holders.

Technical Specifications

  • AC Max Breaking Capacity (I1): 200 kA
  • AC or DC: AC/DC
  • Ampere Rating: 15 A
  • Body Insulating Material: PolyTube
  • Connection Terminal Material: Copper
  • Connection Terminal Type: Ferrule
  • Frequency: 50/60 Hz
  • Fuse Class: Class RK5
  • Mounting Method: Clip
  • Product Length: 5 in
  • Product Weight: 0.137 lb
  • Rated Voltage AC: 600 V
  • Rated Voltage DC: 300 V
  • Speed Characteristic: Time Delay

Typical Applications

  • Motor Control Centers and Industrial Equipment Protection
  • Commercial HVAC and Lighting Circuit Protection
  • Power Distribution Panels and Switchgear Applications
  • Manufacturing and Process Control Systems
  • Building Automation and Control Circuits
  • Emergency Power and Backup Systems

Why Mersen?

Mersen TRS-R fuses combine a durable PolyTube insulating body with copper ferrule terminals for secure, high-conductivity connections in professional circuit protection applications. The Class RK5 time-delay design, 15A rating, dual 600VAC/300VDC capability, and 200 kA breaking capacity give electricians and facility teams a dependable component for motor circuits, distribution panels, and other critical loads. Its 5-inch length and clip mounting method ensure straightforward compatibility with standard fuse holders and panel layouts.

Manufacturer Resources

Product Specs

Product Group:
Wiring Devices
Body Insulating Material:
PolyTube
Frequency Hz:
50/60 Hz
Ac Or Dc:
AC/DC
Ac Max I R Breaking Capacity I1:
200 kA
Fuse Class:
Class RK5
Speed Characteristic:
Time Delay
Rated Voltage Ac Ul:
600 V
Department:
Electrical
Mounting Method:
Clip
Product Type:
Fuse

Mersen TRS3-1/2R – Frequently Asked Questions

1) Will a Mersen TRS-R fuse hold in on motor starting inrush without nuisance blowing?
That's what the TRS-R is built for. It's a Class RK5 time-delay fuse, so it rides through the inrush of a motor start or an inductive load and still clears a true short. That makes it the right choice for motor control centers, HVAC compressors, and transformer primaries. If your circuit is all resistive load (heaters, straight lighting, panel feeders with no motors), you don't need the delay and a fast-acting fuse is the better fit.
2) Can I drop a Mersen TRS-R into the fuse block I already have, or do I need a new holder?
The TRS-R is a Class R fuse with a clip mounting method, so it seats in standard Class R fuse clips and blocks. Class R blocks carry a rejection feature that keeps non-current-limiting fuses out, but an R-class fuse like the TRS-R drops straight in. Under 60A the body is a ferrule type with copper end caps; above that the physical size steps up with the amp rating, so match the block's amp class (0-30, 31-60, 61-100, and so on) to the fuse you're ordering.
3) Is a 200 kA interrupting rating enough for a service entrance with a high available fault current?
200 kA is the top tier of interrupting capacity for branch and feeder protection, so the TRS-R covers service entrances and switchgear positions where the available fault current is high. It's also a current-limiting fuse, which means it clears within the first half cycle on a heavy fault and cuts the let-through energy the downstream gear sees. That is what lets a fused disconnect carry a series short-circuit rating well above what the switch alone would hold.
4) What is the difference between a Class RK5 and a Class RK1 fuse, and does it matter which I install?
Both are Class R and both fit the same rejection blocks and clips, so a Class RK5 like the TRS-R is mechanically interchangeable with an RK1 of the same amp and voltage rating. The difference is let-through energy: RK1 limits current harder than RK5, so where an equipment label or a series rating specifically calls for RK1, you have to use RK1. Where the drawing just says Class R or RK5, the TRS-R is your fuse, and its time-delay curve is what keeps motor circuits from nuisance-blowing.
5) How do I size a Mersen TRS-R time-delay fuse for a motor circuit?
Size the TRS-R off the motor nameplate full-load amps, not the breaker size. Because it's a dual-element time-delay fuse, it can be sized close to the running current and still survive the starting surge, which gives you both overcurrent and backup overload protection in one device. Pick the next rating up from your calculated value in the ladder, which runs 2A through 600A with common motor sizes at 15, 20, 25, 30, 40, 50, 60, 100, and 200A. Verify against the NEC table for your motor type and any equipment nameplate that specifies a maximum fuse size.
6) My blown fuse says TRS30R. Do I need to match that exactly?
Match the amp rating, the voltage rating, and the class, and you're right. TRS30R is the 30A version of the Mersen TRS-R, a 600V Class RK5 time-delay fuse, so any replacement has to be Class R (or RK1, which is a step up in current limiting) at 30A and rated 600V or higher. Replacing it with a fast-acting fuse of the same amp rating is the mistake to avoid; on a motor or transformer circuit it will blow on the next start.
7) Can a Square D PowerLogic energy meter fuse pack be used in place of a Mersen TRS-R fuse?
No - they protect different things. The Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses sized for the voltage-sensing leads of a PowerLogic energy meter, so it carries only the milliamp-level current a metering input draws. The Mersen TRS-R is a Class RK5 time-delay fuse rated 600VAC with a 200 kA breaking capacity, built in ampere ratings from 2A up to 600A for the load side of motor circuits and distribution panels. If the fuse clips being refilled feed a motor starter, an HVAC unit, or a panel, the TRS-R is the family to size from; the PowerLogic pack goes in the meter's own potential-lead fuse holders.
8) What amp ratings does the Mersen TRS-R time-delay fuse come in?
The TRS-R runs from 2A up to 600A. The full ladder: 2, 3, 3.5, 4, 5, 6, 6.25, 7, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 75, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 500, and 600 amps. Ordering codes follow the rating, so a 30A is TRS30R and the fractional sizes read as fractions, TRS3-1/2R for 3.5A and TRS6-1/4R for 6.25A.
9) Is the Mersen TRS-R fuse rated for DC circuits as well as AC?
Both. The TRS-R carries an AC/DC rating at 50/60 Hz, with 600V on the AC side. Treat the AC and DC ratings as separate numbers and size to whichever applies to your circuit, because a fuse's DC ceiling is lower than its AC ceiling. For battery banks, DC bus work, or emergency and backup power gear, check the DC figure printed on the fuse body against your system voltage before you commit.
10) Can I standardize my whole facility on one fuse type instead of stocking several brands?
A single TRS-R family covers a wide span of a building: motor control centers, HVAC and lighting circuits, distribution panels and switchgear, process control, and backup power, all on one 600V Class RK5 time-delay platform across 2A to 600A. For a facilities or MRO stockroom that means one bin layout and one ordering convention (amp rating in the part number) rather than mixed classes. Note that a Class R fuse will not fit a Class J, T, or CC holder, so any positions in your plant built for those classes stay on their own fuse.
11) Is a Mersen TRS-R the right fuse for a metering or instrument circuit?
Usually not. The TRS-R starts at 2A and is a power fuse with a time-delay curve meant for loads that surge. Metering potential circuits and instrument transformer secondaries want a small, fast fuse well under an amp: the Square D PowerLogic energy meter fuse pack, for example, is a set of three 0.5A 600V fuses made for exactly that position. Use the TRS-R for the load side of a disconnect and a dedicated meter fuse for the metering leads.
12) Which fuse belongs in the potential leads of a PowerLogic energy meter, and which one belongs in the circuit it is measuring?
Those are two separate fuse purchases. The metering inputs take the Square D PowerLogic Energy Meter Fuse Pack, a set of three 0.5A 600V fuses matched to the meter's sensing leads. The circuit being measured - the motor feeder, panel, or branch the meter is watching - takes a power fuse such as the Mersen TRS-R, a Class RK5 time-delay design rated 600VAC with 200 kA interrupting capability and clip-mounted in standard fuse holders, ordered at the ampere rating the load calls for. A panel retrofit that adds metering usually needs both.
13) What is the Mersen TRS-R fuse body made of and will it hold up in a hot or dirty electrical room?
The TRS-R uses a PolyTube insulating body with copper ferrule terminals. The polymer tube gives you the mechanical protection and dielectric strength for a panel or MCC bucket, and copper end caps keep the contact resistance down at the clip, which matters because a loose or corroded fuse clip is a far more common cause of a hot fuse than the fuse itself. On any re-fuse, clean and check the tension on the clips while the fuse is out.
How fast can I get the Mersen TRS3-1/2R delivered?
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Can I return it if it doesn’t work for me?
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Does the Mersen TRS3-1/2R come with a warranty?
Absolutely. The Mersen TRS3-1/2R is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Mersen TRS3-1/2R?
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