170M8540

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The 170M8540 series from Eaton is a line of 43mm dual-element, time-delay, current limiting fuse designed for the branch-circuit, supplementary protection of commercial and light industrial ac distribution systems. It is UL and CSA-listed and certified to IEC standard 127-2. The fuse’s time delay characteristics allow it to protect motors and other associated equipment from damage due to excessive starting transients.

The fuse establishes a current limit within the system, allowing it to safely draw higher current than what internal protection devices can support. This helps to reduce the damage associated with short-circuit events while ensuring safety of personnel and equipment. The fuse provides a wide range of choices for amp ratings and interrupting ratings allowing users to find the perfect fit for their application.

The 170M8540 is a dual-element, time-delay, current-limiting fuse. It utilizes two elements, a current limiter element and a time-delay element, in order to properly protect the system within a wide range of current levels. The current limiter element works to immediately limit excessive current while the time-delay element keeps the fuse in its operational state in the presence of start-up transients. The different models within the series restrict current limits to more or less secure levels and it is recommended that the correct amp rating model be selected for each application to ensure optimal level of protection with an acceptable degree of selectivity.

The operating principle of the fuse is expected to provide long-term service and safety. During normal operation, the fuse allows current to freely pass through the device without restriction. However, if the current exceeds the rated limit the fuse will begin to heat up and the current limiter element will go into effect and will limit further increase in current. If the excessive current persists the time-delay element will then begin to heat up, causing the fuse to open if the current has not reduced to a limit below the set rating.

The fuse is designed to completely open once it has reached its maximum rated current. This helps to provide optimal safety for personnel and equipment in the environment. The fuse is capable of accommodating surges of up to six times the rated current as a means of improving the system’s protection against short-circuits. Additional specifications include an operating temperature range of -40°C to 65°C and a voltage rating of up to 600 volts.

The 170M8540 series of fuses is used in a variety of different applications. It’s been successfully applied in the lighting, fire protection, appliance, HVAC, telecommunications, motor control, security, and industrial installation systems.

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