UPL21-7612-9 Circuit Protection

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Circuit breakers are safety devices that shut off electrical circuits when they become overloaded to a dangerous level. The UPL21-7612-9 is a high performance circuit breaker designed to replace the traditional fuse systems. Its primary purpose is to provide over-current and short circuit protection without the need for a reset, as required with traditional fuses.

The UPL21-7612-9 consists of three main parts: a direct current (DC) breaker, a vacuum interrupter (VI) and a protective spring. It is manufactured using an insulating epoxy resin for the body, which is reinforced with copper for better current distribution. The VI has vacuum inside, which makes it extremely reliable and temperature resistant. It also has a double pole construction that makes it very simple to install.

The UPL21-7612-9 is typically used as the main circuit breaker in residential, commercial and industrial applications. It is particularly suited for applications in which protection against high currents and short circuits is essential. The breaker is rated for a maximum current of 17.6 kA, making it capable of withstanding up to 16 kW peak power. It is also capable of up to 4000 operations, making it reliable and suitable for long-term use.

The UPL21-7612-9 operates according to the inverse time delay (ITD) concept. It uses a thermal element to calculate the exact activation delay of the release of the breaker. When a short circuit happens, the breaker senses the high current and heats up the thermal element. As the thermal element reaches its setpoint temperature, a pressure release comes out to fully open the breaker, thus protecting the circuit.

In addition to the ITD concept, the UPL21-7612-9 has a shunt release as an extra layer of protection. The shunt release acts as a back-up protection should the thermal element fail to open the circuit. The shunt release actuates by sensing the voltage across the contacts of the breaker, and upon detecting a short circuit, the contacts open and the breaker trips.

Overall, the UPL21-7612-9 is a high performance circuit breaker with an advanced ITD protection concept and shunt release. It is robust and reliable, making it suitable for use in a variety of applications. It is also very simple to install and maintain. With its superior performance and durability, the UPL21-7612-9 is an ideal choice for any environment needing an effective circuit breaker.

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