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Mersen Protistor® square body fuses are available in eight different body sizes, each size having more than seven worldwide acceptable mounting styles, provide maximum flexibility in equipment design and ultimate protection.

Tri-Onic RK5 current-limiting time-delay fuses are engineered for overcurrent protection of motors, transformers, service entrance equipment, feeders and branch-circuits.

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”.

Mersen’s TPMOV® technology eliminates common failure modes that occur in the field with standard metal oxide varistors.

Designed with the industry leading Mersen TPMOV® Technology, NEMA UL SPD meets requirements for UL1449 5th Edition.

Surge-Trap® Modular Surge Protective Device (SPD) is a no-fuse, fail-safe surge suppressor featuring Mersen’s patented TPMOV® technology inside. UL 1449 5th Edition approved, it is DIN-rail mountable featuring a fail-safe self-protected design, visual indicator, and a small footprint.

The innovative and comprehensive Modulostar® range of Mersen fuse-holders is finger-safe under IEC standards to an IP20 grade of protection. Modular fuse-holders are available in 1, 2, 3 or 4 poles, with or without visual blown fuse indicator.

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 compact midget Time Delay and Fast Acting fuses are an excellent choice for "supplementary" protection of lighting, solenoid, motor and transformer circuits.

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.