170M5195

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Electrical design can be a complicated and nuanced business. Many electrical components have specific uses and must be used in the proper application. Specialty fuses are no exception, and the purpose of this article is to explain the application field and working principle of one such device, the 170M5195.

The 170M5195 is a dual-element, time-delay, low breaking capacity fuse used in three-phase electrical motors of up to 30 horsepower. It is typically used in applications where a single motor is powered from two separate sources, with one or more of the sources being provided by a separate circuit. It is especially helpful in scenarios where the starting currents of two sources are not synchronized, such as when one source is a capacitor start motor. Because of its low breaking capacity, the 170M5195 helps reduce the impact of current surge on the motor, reducing the risk of motor damage.

The design of the 170M5195 is based on the latest IEC 60269-2 standards. The fuse is divided into two separate elements, each with its own current carrying capacity. The primary element is an AG-type fuse, rated at either 5.6 or 7.5 amps. This element is designed to trip at 10 times its current carrying capacity, providing excellent protection against overloads. The secondary element is a time-delay fuse, rated at either 10, 15, 20, or 25 amps. This element is designed to trip at 6 times its current carrying capacity, providing short circuit protection and allowing for adequate motor starting current without sacrificing protection.

The 170M5195 has a dual circuit design, with two separate circuits powering the two elements. The main circuit, referred to as the “flag,” consists of two main circuits and the load. When an overload is detected, the flag circuit trips, opening all three contacts. The second circuit, or “timing,” is interposed between the first circuit and the load. A capacitor connected to the timing circuit stores energy, allowing for a time-delay before the fuse trips. This time-delay provides enough time for the motor to reach its full speed and be disconnected from the power source.

The level of protection provided by the 170M5195 is dependent on the current rating of the fuse. A fuse with a higher current rating will provide more protection than a lower rated fuse. As a general rule of thumb, the fuse should be rated at least double the motor\'s rated current. This helps ensure that the fuse can trip before the motor is damaged.

In summary, the 170M5195 is a dual-element, time-delay, low breaking capacity fuse used in three-phase electrical motors of up to 30 horsepower. It is designed to provide both overload and short circuit protection, and is rated at either 5.6 or 7.5 amps in the primary element, and at 10, 15, 20, or 25 amps in the secondary element. The fuse is built to IEC 60269-2 standards, and is designed with two separate circuits, one for the protection of the motor and the other for the time-delay. A fuse with a higher current rating will provide more protection, and the fuse should be rated at least double the motor\'s rated current.

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