2G20UM

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Circuit breakers, as a safety device in domestic and industrial electrical installations, are designed to switch circuits off in the event of an overload or short circuit. Over the years, these devices have evolved in terms of construction, operation, and electrical ratings. One of these developments is the 2G20UM circuit breaker.

The 2G20UM is a miniature circuit breaker (MCB) designed to be used in low voltage (250V) domestic installations. It is a single-pole device that is rated up to 20A and is designed to meet the requirements of IEC60898-1. The device has a rated impulse withstand voltage (Uimp) of 6kV, making it suitable for use in installations with a high frequency of transients. It also has an adjustable tripping current range between 3-20A for overcurrent protection, and an adjustable tripping current range of 0.1-3A for short circuit protection. It has an operating temperature range of -5°C to +40°C. It is enclosed in a white plastic case with its connection terminals mounted on the top.

The working principle of the 2G20UM is relatively simple. When an overload or short circuit occurs in the circuit, the current passing through the device increases significantly. This causes a bimetal strip, which is installed in the device, to become deformed and break the electrical connection of the circuit. The device uses two separate mechanisms for over current and short circuit trip, depending on the current intensity. In the case of an overload, a thermal bi-metallic strip is used, while for short circuit, the device relies on magnetic trip principle. In the case of an overload, the heat generated by the current passing through the bimetal causes it to move and open the circuit connection. In the case of a short circuit, the large current passing through the device causes a strong magnetic field to be created, which in turn causes a plunger to be released and disconnect the circuit.

In terms of applications, the 2G20UM can be used in a variety of domestic and light industrial electrical installations. It is often use to provide overload and short circuit protection for lighting and small motor loads. This device is ideal for applications where the electrical load is subject to occasional transient overloads, and for locations where the operating temperature is likely to be higher. This device is also advantageous in installations where space is restricted, as it is a very compact device.

In conclusion, the 2G20UM circuit breaker is an ideal choice for domestic and light industrial applications. It is a single-pole device rated up to 20A, with adjustable tripping current ranges for both overload and short circuit trips. Additionally, it is enclosed in a small plastic case, and has a high impulse withstand voltage, making it suitable for installations that experience transients.

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