Mersen TR20R Fuse TR-R - Class RK5 - Time-Delay 250VAC 160VDC 20A Ferrule Tri-Onic®
Alternate Item Number: TR20R
UPC: 782001747848
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Overview
- Time-delay characteristic safely handles motor start-ups and transformer inrush currents.
- Current-limiting design for low peak let-thru current.
- AC & DC rated: 250VAC / 160VDC.
- Rejection-style design prevents replacement errors when used with recommended fuse blocks.
- Durable fiberglass body and high-grade silica filler for reliable performance in harsh environments.
Specifications
AC Voltage Rating | 250 V |
Amperage Rating | 20 A |
Application | Motor circuits Mains Feeders Branch circuits Transformers Service entrance equipment General-purpose equipment |
Body Material | PolyTube |
Brand Name | Mersen |
Class | Class RK5 |
Connection | Ferrule |
Connection Material | Copper |
Connection Type | Ferrule |
Current Rating | 20A |
Interrupt Rating | 200 kA |
Mounting | Clip |
Series | Tri-Onic TR-R |
Size | 2 x 0.56 in |
Size | 50.8 x 14.3 mm |
Size | 2 x 0.56;50.8 x 14.3 in;mm |
Size | Ferrule |
Special Features | Time-delay Current-limiting AC & DC rated Optional solid state SmartSpot blown fuse indicator Time-delay for motor start-ups and transformer inrush currents without nuisance opening Current-limiting for low peak let-thru current Rejection-style design prevents replacement errors (when used with recommended fuse blocks) Easy-to-read label for quick brand recognition and replacement Metal-embossed date and catalog number for traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings High-grade silica filler ensures fast arc quenching and high current limitation |
Standard | UL listed to standard 248-12 File E2137 CSA certified to standard C22.2 no. 248.12 DC listed to UL standard 248 TRS only |
Sub Brand | Tri-Onic® |
Type | Class RK5 |
Voltage Rating | 250 VAC |
Package Dimensions (L x W x H) | 2 in x 0.56 in x 0.56 in |
Package Dimensions (L x W x H) | 50.8 mm x 14.3 mm x 14.3 mm |
Package Weight (Imperial) | 0.037 lb |
Package Weight (Metric) | 0.017 kg |
GPM-SRR90
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C331156
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
LCC5
POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
Frequently Asked Questions
What is the voltage and amp rating for TR-R fuses?
TR-R fuses are rated for 250VAC and 250VDC for .1-2.8A and 35-400A, and 160VDC for 3-30A and 450-600A. Amperage ranges from 1/10 to 600A.
What are the voltage and amp ratings for TRS-R fuses?
TRS-R fuses are rated for 600VAC and 600VDC for .1-12A and 70-600A, and 300VDC for 15-60A. Amperage ranges from 1/10 to 600A.
What is the interrupting rating for TR-R and TRS-R fuses?
TR-R and TRS-R fuses have an interrupting rating of 200kA I.R. AC. For DC, TR-R is 20kA I.R. DC, and TRS-R varies from 20kA to 100kA I.R. DC.
Does this fuse have a blown fuse indicator option?
Yes, an optional solid-state SmartSpot blown fuse indicator is available. To order, add 'ID' to the end of the catalog number.
Are these fuses UL listed and CSA certified?
Yes, they are UL listed to standard 248-12 (File E2137) and CSA certified to standard C22.2 no. 248.12.
What applications are these fuses designed for?
These fuses are engineered for overcurrent protection of motors, transformers, service entrance equipment, feeder, and branch circuits.
What is the purpose of the time-delay feature?
The time-delay characteristic safely handles harmless starting currents and inrush currents associated with motors and transformers without nuisance opening.
What is the benefit of the current-limiting feature?
The current-limiting feature provides low peak let-thru current, offering protection against overcurrents.
Are there specific fuse blocks recommended for these fuses?
Yes, recommended fuse blocks with box connectors are available for Tri-Onic® Class RK5 fuses, with different models for 250V and 600V ratings.
What is the construction of the fuse body?
The fuse body is made of fiberglass, providing dimensional stability in harsh industrial settings.
Frequently Asked Questions about Mersen
What industries and applications are Mersen products used for?
Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.
What are the main product lines offered by Mersen?
Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.
What are the key features of Mersen products?
Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.
What environmental ratings do Mersen products have?
Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.
What accessories are available for Mersen products?
Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.
How are Mersen products typically installed?
Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.
What certifications and standards do Mersen products comply with?
Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.
What technical support does Mersen offer?
Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.