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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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$51.83
Mersen Tri-Onic TRS-R Class RK5 Time-Delay Fuse, 600VAC/600VDC
The Mersen Tri-Onic® TRS-R is a current-limiting, time-delay Class RK5 fuse engineered for overcurrent protection of motors, transformers, service entrance equipment, feeders, and branch-circuits. This TRS-R family is offered across a Motor FLA range from 175A to 500A, allowing you to match the fuse to the specific full-load amperage of your motor or circuit application. Every fuse in the family shares a Blade connection/terminal type, a 600VAC/600VDC rating, and an AC max interrupting rating of 200 kA, so the TRS-R safely rides through the harmless starting and inrush currents typical of today's motors and transformers regardless of which amperage option you select. Each fuse includes the Mersen SmartSpot® visual indication system, making blown-fuse identification fast during troubleshooting.
Key Features
- Motor FLA Range: Available from 175A through 500A to match motor full-load amperage and circuit protection requirements.
- Time-Delay Characteristic: Safely handles harmless starting and inrush currents from motors and transformers without nuisance opening.
- Fuse Class: Class RK5 current-limiting design for reliable overcurrent protection.
- Connection/Terminal Type: Blade terminal with Tin-Plated Copper construction for a secure, low-resistance connection.
- Mounting: Clip mounting for standard fuse holder and disconnect compatibility.
- Indication System: SmartSpot® visual indication for quick identification of a blown fuse.
- AC Max I.R./Breaking Capacity: 200 kA interrupting rating for demanding fault-current environments.
- Rated Voltage: 600V AC / 600V DC, AC/DC rated for versatile system applications.
- Frequency: 50/60 Hz.
- Body/Insulating Material: PolyTube construction.
Certifications & Compliance
- RoHS Compliant
- UL-Rated Voltage: 600V AC / 600V DC
Technical Specifications
- Motor FLA Options: 175A, 500A
- Connection/Terminal Type: Blade
- Indication System Type: SmartSpot®
- Mounting: Clip
- Connection/Terminal Material: Tin-Plated Copper
- Indication System: Yes
- AC Max I.R./Breaking Capacity: I1: 200 kA
- ROHS Compliant: Yes
- Frequency (Hz): 50/60 Hz
- Speed/Characteristic: Time Delay
- Rated voltage AC UL: 600 V
- AC or DC: AC/DC
- Rated voltage DC UL: 600 V
- Fuse Class: Class RK5
- Body/Insulating Material: PolyTube
Typical Applications
- Motor Overcurrent Protection
- Transformer Protection
- Service Entrance Equipment
- Feeder Circuit Protection
- Branch-Circuit Protection
Why Mersen?
Mersen engineers the Tri-Onic TRS-R Class RK5 line with a Tin-Plated Copper Blade terminal, PolyTube insulating body, and a 200 kA AC interrupting rating to deliver dependable, code-compliant overcurrent protection across the full 175A to 500A Motor FLA range for demanding motor, transformer, and branch-circuit applications. The built-in SmartSpot® indication system speeds up field troubleshooting, and RoHS compliance supports environmentally responsible electrical installations.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Connection Terminal Type:
- Blade
- Indication System Type:
- SmartSpot®
- Mounting Method:
- Clip
- Connection/Terminal Material:
- Tin-Plated Copper
- Indication System:
- Yes
- AC Max I.R./Breaking Capacity: I1:
- 200 kA
- ROHS Compliant:
- Yes
- Frequency (Hz):
- 50/60 Hz
- Speed/Characteristic:
- Time Delay
- Rated voltage AC UL:
- 600 V
- AC or DC:
- AC/DC
- Rated voltage DC UL:
- 600 V
- Fuse Class:
- Class RK5
- Body/Insulating Material:
- PolyTube
- list_batch:
- MERSEN-20260825
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Time-Delay Fuse
- Grade:
- Class RK5
- Connection Type:
- Blade
- Product Finish:
- Tin-Plated Copper
- Voltage Rating:
- 600V
- Amperage Rating:
- 175A - 500A
- Listing:
- RoHS Compliant
- Product Material:
- PolyTube
- Product Subgroup:
- Fuses
Mersen TRS175RID – Frequently Asked Questions
1) Will a Mersen TRS-R fuse fit my existing Class R fuse block or disconnect?
The Tri-Onic TRS-R is a Class RK5 fuse with blade terminals and clip mounting, so it drops into standard Class R rejection fuse blocks, holders, and fused disconnects sized for the same amperage. Because it is Class R, it will seat in a rejection-type clip that blocks non-current-limiting Class H/K fuses. Terminals are tin-plated copper for a low-resistance clip connection.
2) Can I use the Mersen TRS-R on a 600V DC circuit, or is it AC only?
Both. The TRS-R carries a UL rated voltage of 600 V AC and 600 V DC, and the family is listed as AC/DC rated at 50/60 Hz. Note that the 200 kA interrupting rating published for it is the AC figure, so size DC fault duty against the manufacturer's DC data.
3) What amp ratings does the Mersen Tri-Onic TRS-R come in?
The TRS-R range runs 175A to 500A. Two ratings are offered: 175A as TRS175RID and 500A as TRS500RID. Pick the rating against the motor full-load amperage or the feeder it protects, not against the breaker frame size.
4) Will a time-delay fuse like the TRS-R blow on motor inrush?
No. The TRS-R is a time-delay characteristic fuse, built to ride through the harmless starting and inrush current of motors and transformers without nuisance opening, while still clearing a real overload or short. For a resistive or electronic load with no inrush, a fast-acting fuse is the better choice.
5) Can a Littelfuse CCMR Class CC time-delay fuse be used in place of a Mersen TRS-R?
No. The CCMR040 is a Class CC time-delay fuse rated 40A, a midget-body fuse that mounts in Class CC clips with a rejection feature. The Mersen Tri-Onic TRS-R is a Class RK5 time-delay fuse covering a 175A to 500A amperage range with blade terminals and clip mounting, rated 600V AC and 600V DC with a 200 kA AC interrupting rating. The two classes use entirely different holders and different amperage territory, so they are not interchangeable. Use the CCMR where a Class CC control-circuit or small branch-circuit fuse is specified and the TRS-R where an RK5 motor, transformer, or feeder fuse is called for.
6) I need fuses for a PowerLogic energy meter, not a motor. Does the TRS-R work?
No. For a Square D PowerLogic energy meter, the matching part is the PowerLogic energy meter fuse pack, a set of three 0.5A 600V fuses sized for metering potential circuits. The Mersen Tri-Onic TRS-R is a Class RK5 time-delay fuse sized from 175A to 500A for motor, transformer, service entrance, feeder, and branch-circuit protection, so it is far above metering-circuit current. Keep the TRS-R on the power side and use the meter fuse pack on the instrument side.
7) Is 200 kA enough interrupting rating for a service entrance with high available fault current?
The TRS-R is rated 200 kA AC interrupting, which is the top tier for Class R fuses and covers service entrance, feeder, and branch circuit locations on systems up to 600 V. It is also current-limiting, so it reduces the let-through energy reaching downstream gear during a bolted fault.
8) How do I tell if a Mersen TRS-R fuse has blown without pulling it and testing it?
Each TRS-R carries the Mersen SmartSpot visual indicator, so a blown fuse shows itself on inspection. That cuts troubleshooting time on a three-phase disconnect where one leg is open, which matters for maintenance crews working live gear.
9) Can I swap a TRS-R in place of a glass tube or midget fuse I already have?
No. The TRS-R is a 600V Class RK5 blade-terminal fuse in the 175A to 500A range. Small fuses like the Littelfuse AGU Series glass tube, the AGA Series 5A, or the BLF Series 250V midget fast-acting fuse are low-amperage ferrule or glass cartridge types for entirely different holders. If you are replacing one of those, stay in that family rather than moving to a Class R.
10) What is the difference between the Mersen TRS-R and a Littelfuse BLF midget fast-acting fuse?
Two different jobs. The BLF is a midget fast-acting fuse rated 250V with a laminated tube body, built to clear faults quickly where there is no inrush to ride through. The Mersen Tri-Onic TRS-R is a time-delay Class RK5 fuse with a PolyTube body, rated 600V AC and 600V DC, sized by motor full-load amperage from 175A to 500A. If the load is a motor or transformer that draws starting or inrush current, the time-delay TRS-R is the correct characteristic; a fast-acting midget fuse in that spot opens on normal startup.
11) Is a Littelfuse AGA or AGU glass fuse an alternative to the Mersen TRS-R?
No. The AGA5 is a 5A AGA-series glass fuse and the AGU is an AG-series glass tube fuse; both are small ferrule-style glass cartridge fuses for low-current electronic, appliance, and automotive-style circuits. The Mersen Tri-Onic TRS-R is a 600V AC / 600V DC Class RK5 power fuse with tin-plated copper blade terminals, clip mounting, and a 200 kA AC interrupting rating, covering 175A to 500A. Nothing in the glass-fuse families will fit an RK5 fuse clip or carry that fault current.
12) Is the Mersen TRS-R RoHS compliant for a specified institutional project?
Yes, the Tri-Onic TRS-R is RoHS compliant. Body construction is PolyTube insulating material with tin-plated copper blades.
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Does the Mersen TRS175RID come with a warranty?
Absolutely. The Mersen TRS175RID is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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