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Protection switch

A protection switch, switch technology, applied in the direction of emergency power supply protection, emergency protection circuit device, protection reacting to overvoltage, etc., can solve the problems of difficult, impossible and expensive implementation

Active Publication Date: 2018-06-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Implementation of such protective switches is difficult, expensive or even impossible

Method used

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  • Protection switch

Examples

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Embodiment Construction

[0045] figure 1 A circuit with first and second transistors Q1, Q2; first, second and third resistors R1, R2, R3; input Enable; first power supply terminals Vdc1, Ground; power supply output Vdc2 is shown.

[0046]The input end Enable is connected to the third resistor R3, and the third resistor R3 is connected to the base of the first transistor Q1. The first transistor Q1 is, for example, an NPN transistor. Its emitter is connected to the terminal Ground of the first power supply. Its collector is connected not only to the first resistor R1, but also to the second resistor R2. The other end of the first resistor R1 is connected to the first power supply terminal Vdc1, which in turn is connected to the emitter of the second transistor Q2. The second transistor Q2 is, for example, a PNP transistor. Its base is connected to the other terminal of the resistor R2. The collector of the second transistor Q2 forms a terminal Vdc2 as an output terminal of the power supply.

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PUM

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Abstract

The invention relates to a protection switch for a low voltage circuit. The protection switch is endowed with a fire-proof switching function capable of determining fault arc of the low voltage circuit and interrupting the low voltage circuit in the event of an arcing fault limit value being exceeded, a fault-current switch-protecting function that can ascertain fault currents in the electrical low voltage circuit and, in the event of a fault current limit value being exceeded, can interrupt the electrical low voltage circuit; and an electrical power supply for the arc fault detection device function and the fault-current switch-protecting function. The protection switch is configured such that the voltage in the low voltage circuit is ascertained and the fire-proof switching function is disengaged in the event of a first limit value of the voltage not being reached.

Description

technical field [0001] The invention relates to a protective switch for protecting a low-voltage circuit and a method for a protective switch for a low-voltage circuit. Background technique [0002] Low voltage refers to voltages up to 1000 volts alternating current or up to 1500 volts direct current. [0003] A protective switch is a combination switch which integrates the function of a fault current switch as known from a fault current switch or a residual current circuit breaker and a fire switch as known from a fire switch or an arc fault detection device. Furthermore, it is also possible to integrate line breaker functions as known for line breakers or miniature circuit breakers. In addition, other functions can also be integrated. [0004] A line protection switch generally refers to a low voltage line protection switch for currents up to 125 amperes, more specifically up to 63 amperes. [0005] The line protection switch prevents overcurrent and short circuit in th...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/04
CPCH02H3/04H02H3/20H02H1/06H02H1/0015H02H3/33
Inventor J-M.马特尔
Owner SIEMENS AG
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