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Industrial Automation & Robotics

MERSEN Solutions for Industrial Motors & Controls

Mersen plays a vital role in the industrial automation and robotics industries, particularly in motors and controls, by providing advanced solutions for electrical protection, thermal management, and power distribution. Their wide range of products is engineered to ensure equipment reliability, operational efficiency, and system safety in demanding environments. Engineering professionals in the industrial and robotics industries choose Mersen products for motors and controls applications because of the company’s proven expertise in delivering high-performance, reliable, and safety-focused solutions. Mersen offers a comprehensive range of products—including fuses, surge protection devices, thermal management systems, and carbon brush technologies—that are specifically engineered to meet the demanding requirements of motor-driven and automated systems. These products are designed to protect sensitive components from electrical faults, ensure consistent thermal regulation, and simplify power distribution, all of which are essential for maintaining system uptime and operational efficiency. In environments where equipment is subjected to constant use, high currents, and harsh operating conditions, Mersen’s solutions offer the durability and precision needed to prevent costly failures and downtime. Their fuses and protection devices meet global standards and are trusted in critical motor control panels and VFD installations. Meanwhile, their thermal management solutions help extend the life of high-power components such as IGBTs and servo drives, which are common in robotics and industrial automation. Mersen also provides robust power distribution blocks and busbars that streamline wiring and improve space efficiency in control cabinets. For rotating machinery, their carbon brush and brush holder technologies support reliable power transmission and motor performance. 

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FEATURED PRODUCT SOLUTIONS:

Low Voltage Switches

Compact, manually operated switch designed to safely isolate electrical circuits operating at low voltage (typically up to 1000V AC or DC). It is used in motor and control applications to provide a reliable means of disconnecting power for maintenance, troubleshooting, or emergency shutdowns. They are designed to Interrupt electrical current under load, Provide visible isolation of power (often with padlockable handles for safety), Integrate easily into control panels, motor control centers (MCCs), and equipment enclosures.

Key Features:

  • Compact footprint for space-limited control panels
  • High short-circuit current rating (SCCR) for system protection
  • Front or side-operated handles (often lockable for LOTO compliance)
  • Optional fuse integration for overcurrent protection
  • Robust terminals for secure wiring and high vibration resistance

Fuses & Fuse Holders

Mersen fuses are engineered to provide high-performance overcurrent protection across a wide range of industrial and robotics systems. From motors and drives to control circuits and power distribution, Mersen fuses ensure safe, reliable operation while minimizing costly downtime and equipment damage. Their advanced fuse technologies are critical in preventing overcurrent, short circuit, and ground fault events that can disrupt operations and damage sensitive components.

In industrial motor and control applications, Mersen fuses interrupt high fault currents during motor startup and operation, protecting windings and motor controllers. In control systems, they safeguard PLCs, panels, and auxiliary circuits from overloads or faults. Mersen also provides robust protection for variable frequency drives (VFDs) and soft starters, mitigating the risks of both internal and line-side faults. In branch circuits and transformer protection, Mersen fuses help isolate faults, preventing cascading failures in complex multi-load environments. With UL, IEC, and CE certifications and excellent resistance to vibration, temperature fluctuations, and electrical noise, Mersen fuses deliver long-term reliability and enhanced safety in industrial automation, CNC equipment, and robotic arms—ensuring continuity in even the most demanding applications.

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The most current-limiting UL-Class fuse, Mersen’s Class J fuses provide optimal performance, prevent interchangeability with older code fuses, and save valuable panel space. The Class J Fuse Range includes MERSEN’s AJT Series, HSJ Series, A4J Series, and AJT Reducer Fuses.

Class J Fuse Holder Range includes MERSEN’s Class J Gen2, Gen2-DFC & Class J Fuse Holders, the UltraSafe US3J and US6J Class J Fuse Holders, and DFC Series Dead Front Covers

Mersen’s new Generation 2 open style class J fuse blocks accommodate class J fuses ranging from 0-100A, 600V. A choice of screw, pressure plate, and box connectors fit a wide range of stranded or solid wire. Gen2 fuse blocks are DIN-rail mountable, more compact than the traditional offering, and feature dovetail nesting for multipole field assembly. Fuse bases are IP20 rated when paired with Mersen’s newly designed dead front covers.

Features & Benefits:

  • DIN-rail mountable, 600V, 30-100A fuse bases

  • 30A is available with box, screw, and pressure plate terminations; 60A & 100A is available with box only

  • Fresh new Mersen gray color for fuse base

  • Dovetail design for interlocking configuration of 2-pole and 3-pole bases

  • Unique molding around the termination to accommodate hinged cover and for increased safety

  • Built-in lockout/tagout feature

  • IP20 finger safe

  • New clear covers with indicators for safety and visual inspections

  • Multi-connector wiring options

Data Sheet

Amp-Trap 2000® AJT fuses provide non-indication as well as a SmartSpot visual open fuse indicator. With advanced material technology the AJT fuse provides IEC Type 2 No Damage protection to main, feeder, and branch circuits, for all types of loads — yet, they require only half the mounting space needed for 600VAC Class RK fuses. AJT’s time-delay characteristics are ideal for handling typical motor and transformer inrush currents, while also providing superior current-limiting ability.

Features & Benefits:

  • Non-indicating or solid state SmartSpot visual blown fuse indicator
  • Time-delay for motor starting and transformer inrush
  • 300kA interrupting rating – self-certified, UL witnessed tests
  • Extremely current-limiting for low peak let-thru current
  • Most current-limiting UL class fuse
  • Recommended for Arc Flash energy reduction
  • Small footprint requires less mounting space and allows smaller, more economical fuse blocks
  • Easy 2-to-1 selectivity for prevention of nuisance shutdowns
  • Unique Class J dimensions prevent replacement errors
  • High-visibility orange label gives instant brand recognition
  • 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
  • Optional EI indicator/switch mount for AJT70 to 600 open fuse indication

Resources:

PROTECT YOUR WIRING AND POWER SEMICONDUCTORS WITH A SINGLE FUSE

The High Speed Class J (HSJ) combines the low I2t of a semiconductor fuse and the branch-circuit performance of a Class J UL Listed fuse into a single design. The HSJ can provide both branch circuit protection per NEC requirements, as well as very low I2t for protection of power semiconductors such as Diodes, SCRs, GTOs and SSRs. Applications Include: Branch Circuits, Control Panels, Electronic Motor Controllers, Phase Controllers, Drives, Soft-Starters, Solid State Relays

Features & Benefits:

  • Optimized over-load capability for withstanding elevated levels of current during electronic motor controller starts

  • Low I2t (low thermal energy)

  • Excellent cycling ability for frequent starts/stops without nuisance opening

Data Sheet

Mersen’s Class CC High Interrupting Rating Time Delay and Fast Acting compact fuses, are ideal for protection of smaller motors, control circuits and control transformers up to 30A. Mersen’s Class CC Fuse Range includes ATQR & ATDR Time-Delay Series and ATMR Fast-Acting Series.

Mersen’s Class CC Fuse Holder Range Includes UltraSafe USCC & USGCC Series, 303 Series Open-Style Fuse Blocks, and Modulostar CUSCC Series.

Modulostar is a family of modular fuse-holders / fuse bases mainly used in low-voltage power distribution contexts — for protecting motors, transformers, control circuits, and general low-voltage distribution networks. The Modulostar family includes CUS10, CMC10, CMC8, Ultrasafe CMS27 CUSCC, CMS22, CMS14. They are finger-safe under IEC standards to an IP20 grade of protection. They are available in 1, 2, 3, or 4 poles with or without visual blown fuse indicator.

CMC10 Finger Safe Fuse Holders

The innovative and comprehensive Modulostar® range of Mersen fuse-holders. Modular fuse-holders are finger-safe under IEC standards to an IP20 grade of protection, including fuse changing (with the flick of a finger). Modular fuse-holders are available in 1, 2, 3 or 4 poles, with or without visual blown fuse indicator. Multi-pole units can also be field assembled by ordering pin-ties assembly kit. Modulostar® range is made of tough and durable thermoplastic or thermoset material.

Key Features & Benefits:

  • Modular design

  • Compact design for space saving

  • DIN rail mounting

  • Degree of protection: IP20

  • Finger safe

  • Easy access to the fuse

  • Lockable without accessory

  • Sealable in closed & open position

  • Optional visual blown fuse indicator

  • Multi-pole assembly kit available

  • Plastic material UL94V2 mini

  • Plastic material R22HL2 for railway application

  • Flame retardant materials with glow wire flammability index to 960°C

  • Schock and vibration tested for marine and railway applications

  • Approvals/Standards:  IEC 60269-2 and IEC 60947-3 Compliance,  RoHS, Reach compliant,  Marine certificates 

ATQR – Time-Delay

ATQR small-dimension fuses feature time-delay characteristics ideally suited for the high inrush currents of control transformers, solenoids, and similar inductive loads. Mersen’s Amp-Trap 2000 ATQR fuses provide superior protection for the branch circuits of electrical distribution systems. Applications: Control Transformers, Solenoids, Inductive Loads, Lighting, Heating & General-purpose Loads.

Features & Benefits:

  • Time-delay for control transformer inrush loads without nuisance opening

  • Highly current-limiting for low peak let-thru current

  • Rejection-style design prevents replacement errors (when used with recommended fuse blocks)

  • High visibility orange label ensures instant brand recognition, and simplifies 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

Data Sheet

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ATDR – Time-Delay

Amp-Trap 2000 time-delay ATDR small-dimension fuses provide IEC Type 2 “no damage” protection to your facility’s increasingly sensitive branch circuit components and small motors – minimizing the risk of fault-related damage. ATDR Class CC fuses deliver the best time-delay characteristics in their class with excellent cycling ability for small motor loads. Applications: Small Motors, Contactors, Lighting, Heating & General Loads, Branch Circuit Protection

Features & Benefits:

  • Time-delay for motor starting inrush currents without nuisance opening

  • Highly current-limiting for low peak let-thru current

  • Improved cycling ability for frequent motor starts/stops without nuisance fuse opening

  • Rejection-style design prevents replacement errors (when used with recommended fuse blocks)

  • High-visibility orange label ensures instant brand recognition, simplifies 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 optimum current-limitation

Data Sheet

Amp-Trap ATMR fast-acting fuses are the smallest dimension 600V fuses suitable for branch-circuit protection. The ATMR is a popular choice for economical protection of control circuits and control circuit transformers where available short circuit currents exceed 10,000 amperes. ATMR’s rejection dimensions prevent substitution by lesser rated fuses. These fast-acting fuses give current-limiting protection to general circuits. Applications Include: Control Circuits, Lighting, General Loads, Branch Circuit Protection

Features & Benefits:

  • Rejection-style design prevents replacement errors when used with recommended fuse blocks

  • Versatile design for individual component and branch circuit protection

Data Sheet

Tri-Onic RK5 current-limiting time-delay fuses are engineered for overcurrent protection of motors, transformers, service entrance equipment, feeders and branch-circuits. RK5 Fuses are widely used in Motor Circuits, Lighting and Heating Loads, Panelboards and Switches, Transformers and Feeders, and Control Circuits Applications. RK5 Fuse Range Includes TRS-R 600V Time-Delay Series, TR-R 250V Time-Delay Series, Class R 600V Fuseholders, and Class R 250V Fuserholders.

RK1 Fuses & Fuse Holders

Significantly more current-limiting than Class RK5, K and H fuses, Mersen’s Class RK1 fuses are ideal for upgrading your existing feeder and branch circuits to arc flash category “0”. RK1 Fuse Range Includes A6K-R Fast-Acting Series, A2K-R Fast-Acting Series, A6D-R Time-Delay Series, and A2D-R Time-Delay Series. Ideal applications for the RK1 Class of Fuses includes: Load Centers, Panelboards, Switchboards, Bus Duct, Feeder Circuits, Non-inductive Loads, Motors, Safety Switches, Transformers, Disconnects, and Lighting circuits.

Key Features & Benefits:

  • Time-Delay – Allows for safe passage of high inrush currents (e.g., motor startup) without nuisance opening
  • High Interrupting Rating – Up to 200 kA RMS Symmetrical, ensuring protection in high fault-current environments
  • Current Limiting – Superior energy let-through (I²t limitation) compared to RK5, minimizing equipment damage during faults
  •  Ratings: Available in 250V AC and 600V AC models;   From 1A to 600A
  • Compliance – UL 248-12; also CSA Certified and RoHS compliant
  • Compact Size – Same dimensions as RK5; fits standard fuse holders and disconnects
  • Blade & Ferrule Styles – Depending on amperage rating for easy installation and replacement

Certified as Special Purpose UL/CSA Listed Class RK1 fuses, these reduced current rating fuses are designed to fit into the next larger size fuse holders, providing the same high reliability performance, durability, and arc flash mitigation as standard Class RK1 fuses. Reducer Fuses can help achieve greater efficiency within a facility and are ideally suited for start-up or newly expanded manufacturing facilities that are ramping up production and electrical power demand. Upon approaching full capacity, the reduced rating Reducer Fuses can be readily replaced by higher standard rating fuses of the same body size, thus eliminating the need to replace the fuse panel.

Another key benefit of RK1 Reducer Fuses is that they are ready to install and replace directly out of the box, minimizing production downtime.

Mersen is the only fuse manufacturer to offer Reducer Fuses.

Products included in this series are A6D-R Reducer Fuse, A2D-R Reducer Fuse, and AJT Reducer Fuse Class J Series

Tri-Onic TRS-R current-limiting time-delay fuses are engineered for overcurrent protection of motors, transformers, service entrance equipment, feeders and branch-circuits. The time-delay characteristics of the TRS-R safely handle harmless starting currents and inrush currents associated with today’s motors and transformers. Ideal Applications Include: Motor circuits, Mains, Feeders, Branch Circuits, Transformers, Service Entrance Equipment, and General-purpose Equipment.

Features & Benefits:

  • 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

Data Sheet

Tri-Onic TR-R current-limiting time-delay fuses are engineered for overcurrent protection of motors, transformers, service entrance equipment, feeders and branch-circuits. The time-delay characteristics of the TR-R safely handle harmless starting currents and inrush currents associated with today’s motors and transformers. Ideal applications include Motor circuits, Mains, Feeders, Branch Circuits, Transformers, Service Entrance Equipment, and General-purpose Equipment.

Features & Benefits:

  • 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

Data Sheet

Mersen’s compact midget Time Delay and Fast Acting fuses are an excellent choice for “supplementary” protection of lighting, solenoid, motor and transformer circuits. At 10×38 mm (or 1.5″ x 13/32″) they are designed for protecting small motors, lighting, control circuits, and more. Mersen’s Midget Fuse Range includes ATM 600VAC/DC Fast-Active Series, DCT 750VAC/1000VDC Fast-Acting Series,  ATQ 500VAC Time-Delay Series, OTM 250VAC Fast-Acting Series, TRM 250VAC Time-Delay, GFN and PCT Time-Delay Series, and PCS, PCF, and SBS Fast-Acting series’. 

Midget Fuse Holder Range includes 303 Open-Style Fuse Blocks, Modulostar CUS10 Series, UltraSafe USGM and USM Series’, and the FEB and FEX Series’.

Amp-Trap® midget fast-acting ATM fuses are rated 600 volts AC and DC, with a 100kA interrupting rating. These ratings give the ATM a wide range of applications not covered by other midget fuses. In addition, ratings of 30/35, 30/40 and 30/50 amperes are offered for specific applications such as capacitor protection. These ATM fuses must still be considered 30A fuses because of their dimensions, but are able to withstand much higher inrush currents and tougher duty cycles. (Not for Branch Circuit Protection). Ideal for all applications up to 600VAC and 600VDC with 100kA I.R.

Features & Benefits:

  • For supplemental protection of small motors and transformers

  • Extended ratings for special protection of capacitors and circuits with high inrush currents

  • 600VDC ratings for a wide variety of applications including photovoltaic and solar applications.

  • Can be used with UltraSafe™ fuse holders

  • 1 1/2″ x 13/32″ (10mm x 38mm) dimensions

Data Sheet

ATQR small-dimension fuses feature time-delay characteristics ideally suited for the high inrush currents of control transformers, solenoids, and similar inductive loads. Mersen’s Amp-Trap 2000 ATQR fuses provide superior protection for the branch circuits of electrical distribution systems. Applications: Control Transformers, Solenoids, Inductive Loads, Lighting, Heating & General-purpose Loads.

Features & Benefits:

  • Time-delay for control transformer inrush loads without nuisance opening

  • Highly current-limiting for low peak let-thru current

  • Rejection-style design prevents replacement errors (when used with recommended fuse blocks)

  • High visibility orange label ensures instant brand recognition, and simplifies 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

Data Sheet

NH Fuse-Links, Fuse-Bases, And Fuse-Disconnectors – The offering encompasses a complete range of NH Switch Fuse Disconnectors and any class of NH power fuses: gG, aM, gTr.

Mersen NH gBat fuse series was engineered specifically for protection of battery systems. They offer full range protection and can protect very small over currents as well as DC fault current up to 150kA. The NH gBat fuses serie covers various ratings in 1000VDC with NH1 and NH2 sizes, and in 1500VDC with NH1XL, NH2XL and NH3L sizes. They are gBat type that comply with new IEC 60269-7 standard for Battery protection. They are available with bolted type blades for direct mounting, or with plain blades.

Features & Benefits:

  • Design for DC applications
  • Full range breaking capacity
  • Low watt losses
  • Minimum breaking capacity 2IN
  • High cycling performance
  • High interrupting rating up to 150kA

NH Fuse Flyer

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Power Distribution Blocks

Mersen’s power distribution blocks (PDB’s) play a critical role in industrial motor and control applications by efficiently distributing power from a single input source to multiple branch circuits. Within motor control centers and industrial panels, these blocks help streamline wiring layouts, reduce panel complexity, and improve overall system reliability. By centralizing power connections, Mersen’s distribution blocks allow for easier wiring of motor starters, variable frequency drives (VFDs), relays, and control circuits—supporting faster installation, simplified maintenance, and improved troubleshooting access. Designed to handle high current loads and available with touch-safe options, Mersen’s power distribution blocks also enhance safety in environments where uptime and protection are critical. Their modular design offers flexible configuration, allowing panel builders to optimize space and tailor solutions for a wide range of industrial automation and motor control systems.

Surge Protective Devices (SPDs)

Mersen’s Surge Protection Devices (SPDs) are designed to safeguard electrical systems and equipment from voltage transients caused by lightning strikes, switching events, and power grid disturbances. These devices work by diverting surge energy away from sensitive components to ground, thereby protecting downstream equipment from damage. In industrial motors and controls applications, Mersen SPDs serve several key functions including to Protect Motor Starters and Drives, Safeguard Control Panels and PLCs, Enhance System Reliability and Uptime and to Comply with Standards and Codes. Mersen offers a variety of SPD solutions—including panel-mount, DIN-rail, and Type 1 and Type 2 devices—allowing for tailored protection strategies at the service entrance, distribution level, and point-of-use. In summary, Mersen SPDs are critical components for mitigating transient overvoltages and ensuring the reliable, continuous operation of motors and control systems in demanding industrial settings.

Mersen Surge-Trap® SPDs product line feature our Thermally Protected MOV (TPMOV) technology, a fail-safe, and most reliable surge protection solution on the market. Mersen’s patented invention TPMOV technology, eliminates common and possibly catastrophically failure when the MOV reaches end of life. Internally the TPMOV is comprised of a voltage clamping device and a disconnecting apparatus that monitors the status of the metal oxide disk, making the TPMOV a fail-safe device. In the event of an overvoltage breakdown, the metal oxide disc is securely disconnected from the system power by an arc shield. Upon failure, the TPMOV is also equipped with a visual pin indicator as well as a normally open micro-switch, providing remote indication if applicable.

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