Mersen PCS40-R Fuse PCS - Midget - Fast-Acting 600VAC 600VDC 40A Slot Mount
Alternate Item Number: PCS40-R
UPC: 782001142667
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Overview
- 40A fast-acting fuse for PCB direct mounting
- 600VAC/600VDC voltage rating with 200kA AC/100kA DC interrupting rating
- Extremely fast response time (≤10ms L/R) for semiconductor protection
- Eliminates need for fuse clips and holders, reducing PCB component count
- Part of Mersen PCS series with three mounting styles (slot, double hole, surface mount)
Specifications
AC Voltage Rating | 600 V |
Amperage Rating | 40 A |
Application | Protection of semiconductors, circuit breakers, critical components |
Body Material | GMG |
Brand Name | Mersen |
Class | Midget |
Connection | Slot Mount |
Connection Material | Tin-Plated Copper |
Connection Type | Slot Mount |
Current Rating | 40A |
DC Voltage Rating | 600 V |
Fuse Class | Midget |
Interrupt Rating | 200 kA |
Mounting | PC Mount |
Mounting Type | PCB Mount |
Series | PCS |
Size | 1.53 x 0.41 in |
Size | 38.862 x 10.414 mm |
Special Features | Extremely fast-acting PC board mount Three mounting styles |
Standard | UL Recognized Components File E60314 |
Type | Midget Fuses |
Voltage Rating | 600 VAC |
Package Dimensions (L x W x H) | 1.53 in x 0.41 in x 0.41 in |
Package Dimensions (L x W x H) | 38.862 mm x 10.414 mm x 10.414 mm |
Package Weight (Imperial) | 0.020 lb |
Package Weight (Metric) | 0.009 kg |

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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
Are PCS fuses UL recognized?
Yes, PCS fuses are UL Recognized Components with File E60314.
What are the voltage and amperage ratings for PCS fuses?
PCS fuses are rated for 600VAC/DC and come in amperage ratings from 5A to 40A.
What are the available mounting styles for PCS fuses?
PCS fuses are available in Slot Mount, Double Hole Mount, and Surface Mount styles.
What is the interrupting rating for PCS fuses?
The interrupting rating is 200kA for AC and 100kA for DC.
What applications are PCS fuses suitable for?
They are used for protecting semiconductors, circuit breakers, and other critical components on printed circuit boards.
What is the L/R time constant for PCS fuses?
The L/R time constant is less than or equal to 10ms.
What are the main features of PCS fuses?
PCS fuses are extremely fast-acting, designed for PC board mounting, and come in three mounting styles.
What are the benefits of using PCS fuses on PC boards?
PCS fuses reduce parts by eliminating clips and fuse blocks, allowing for automated assembly and providing protection directly on the board.
What is the clearing I2t value for a 10A PCS fuse?
The clearing I2t value for a 10A PCS fuse is 70 A2s.
What is the melting I2t value for a 40A PCS fuse?
The melting I2t value for a 40A PCS fuse is 1800 A2s.
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.









