CM300

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CM300 is an electrical piece of equipment typically used to protect circuits from over current and short circuit damage. Developed by Cooper Bussmann, the CM300 operates by detecting an over current or short circuit and quickly opening the circuit by interrupting the flow of electricity. It is commonly used in ground fault applications, over current protection and motor control applications, and it also services as a circuit branch protector. The CM300 is classified as a specialty fuse which provides reliable protection where long times of circuit continuity are needed.

The CM300 is designed with a self-contained bimetal element that needs no external control system. The element rapidly opens when current exceeds the maximum set by the fuse. The product features a long time-delay used to address varying needs such as motor protection and over current protection for smaller motor branches. It also has a wide array of current ratings to meet the requirements for the application.

The device is rated for a variety of amperage ratings for both low and high voltage power systems. These ratings range from 6.3 amperes to 600 amperes. Operating temperatures for the device vary from 32°- 176°F (0°- 80°C). The CM300 has the added feature of a blow open spring, providing extra protection in the event of a high fault current. It also comes standard with an electrical indicator lock which allows workers to easily see whether the fuse has gone into overcurrent protection or not.

When connected to a circuit, the CM300 allows for a steady current to flow through the system. Should an electrical surge or short occur, the CM300 will detect this increase in current and quickly act by destroying its element, and in turn interrupting the current flow. This prevents the circuit from experiencing damage due to thermal runaway or over current.

The CM300 is UL-rated 4248-4, and is designed to meet the requirements of UL 248-14. The product is listed as acceptable for application on UL Classified equipment. The device is also recognized as suitable for use in Canada by the Canadian Electrical Code. Additionally, the product has a typical opening time of 1 to 2 seconds and requires an air gap of 0.25”.

The CM300 is an excellent choice for protecting circuits from damage due to over current or short circuits. It is designed to be included in both ground fault and power system applications, and it is also equipped with a range of current ratings to meet the needs of a wide variety of applications. Due to its UL-listing and long time-delay capacity, CM300 offers secure protection, as well as reliable performance for motor control and over current protection.

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