170M2670

170M2670 is a three-phase current-limiting industrial fuse widely used in industrial electric power distribution circuits and can be used in feeders, branch-circuits, control circuits, AC motor circuits and other installations that require current-limiting fusing. With excellent performance and features, 170M2670 fuses can provide superior over-current and short circuit protection for the connected equipment and wiring system. In this article, we will discuss the application field and working principle of this type of fuse.

170M2670 fuse is primarily designed for industrial electric power distribution circuits protection, including load centers, motor control centers, switchgear, panel boards, portable lighting panel boards, disconnects, starters and other control components. Additionally, they can be connected in series with the motor controllers and low voltage induction motors.

170M2670 fuses are available in two different configurations–standard and navy style. The standard design has a 1/4” x 3/4” body and the navy style has a 3/4” x 7/8” body. It is suitable for mountings of up to 600V and available in various ranges of electrical current ratings from 1-30A including UL Listed or CSA Certified. This fuse is ideal for power applications for circuit protection in industry.

A 170M2670 fuse is a thermally–activating fuse. When a current higher than the rated current flows through it, the fuse will gradually heat up, eventually reaching the temperature at which the entire body melts and the fuse element is broken, leading to the permanent interruption of the circuit.

A 170M2670 fuse consists of an encapsulated metal body filled with specially formulated sand. A ribbon–shaped metal element is inserted between the pellets of sand with insulating material between them. This metal element is designed to be exactly the same number of turns per foot as the rated current of the fuse. When the current exceeds the rated current, the resistance of the metal element increases, and produces heat in the fuse. The sand pellets absorb and thermal storage this heat, and deforms the edges of the element maintaining the high resistance–causing higher heat generation–until the temperature reaches the melting point.

The heat generated in the fuse melts the metal body. This causes the fusible element to fall, so it breaks the electrical circuit. The melting time of the fuse is a function of the magnitude of the current. The time may vary from 2 to 10 seconds for current up to 10 times the rated current.

In conclusion, 170M2670 is a three-phase current-limiting industrial fuse widely used in industrial electric power distribution circuits for providing superior over-current and short circuit protection. It is available in two different configurations–standard and navy style– and various ranges of electrical current ratings. It works with the thermally–activating technology, that is, when a current higher than the rated current flows through it, the fuse will heat up until the temperature reaches the melting point. The heat generated in the fuse melts the metal body and breaks the electrical circuit.