0451.500MR

0451.500MR Application Field and Working Principle

Fuses are used in low-voltage circuits as a protective device against over-current and overload. They are also known as thermal cutoffs due to the heat generated when they are activated. The 0451.500MR is a fuse developed by Siemens that is used for motor overload applications. It is designed to be thermal and current-sensitive, providing reliable protection for motor-driven systems.

Design and Construction

The 0451.500MR is a combination of a current-sensitive element and a thermal element. It has two parts: a fast-acting SI fuse and a thermal element, both enclosed in an insulated casing. The thermal element rapidly opens when it reaches its melting point. The fast-acting SI fuse senses high current and opens quickly to protect motor-driven systems. In addition, the 0451.500MR has a manual reset button on the back of its casing and is UL-recognized.

Installation and Maintenance

The 0451.500MR can be installed using standard installation guidelines. It should be placed where it will not be in contact with other equipment or objects, as this can interfere with its function. The fuse should be inspected regularly to ensure its proper functioning, and if it fails to open at the rated current, it should be replaced as soon as possible to prevent damage to the motor and other components in the system.

Working Principle

The 0451.500MR is designed to protect motor-driven systems from overload and over-current. When a overload or over-current condition occurs, the thermal element heats up until it reaches its melting point and opens. This causes a short circuit and breaks the circuit, protecting the motor and other components. The fast-acting SI fuse acts as a backup to the thermal element, opening quickly and providing additional protection.

Benefits

The 0451.500MR fuse is designed to offer reliable motor protection in a compact size. It is also easy to install and maintain, and is UL-recognized. In addition, the manual reset button allows the system to be reset quickly without opening the cabinet. Finally, the combination of a current-sensitive and a thermal element provides added protection for motor-driven systems.