JPH0775221A - Domestic distribution board - Google Patents

Abstract

PURPOSE:To make it possible to apply a proper load restriction and to prevent power service interruption before a branch circuit has a power interruption by informing by alarm the user of a power overload in the branch circuit in a domestic distribution board. CONSTITUTION:Provided are a main circuit having a circuit breaker 1 for trunk wiring and a plurality of branch circuits 4 respectively connected to the main circuit and having circuit breakers 2 for branch circuit wiring. An overload detecting device 6 is connected to the secondary side of each circuit breaker 2 for branch circuit. An alarm circuit 7 connected in parallel to the operating contacts 6a of each overload detecting device 6 is connected in series to a main circuit 3 between the secondary side of the circuit breaker 1 for main trunk wiring and the primary side of the circuit breaker 2 for branch circuit wiring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a household distribution board for protecting a domestic power system.

[0002]

2. Description of the Related Art A domestic distribution board is a device for protecting a power system in a home. FIG. 2 is an example of a double-track connection diagram of a conventional household distribution board. In FIG. 2, the distribution board for home use is a main circuit breaker 1 for the purpose of back-up protection for short circuit accident and overload of the main circuit 3.
And a branch circuit wiring breaker 2 for the purpose of protecting the branch circuit 4 from a short-circuit accident and overload are connected by an electric wire or the like.

[0003]

In such a conventional household distribution board, when the electric power higher than the rating of the branch circuit wiring breaker 2 is used at home, the branch circuit wiring breaker is used. The overload trip device 2 operates and the corresponding branch circuit 4 is cut off. Therefore, the present invention notifies the user by alarming the overload of the electric power of the branch circuit, and can perform an appropriate load limitation before the power failure of the corresponding branch circuit, thereby preventing the power failure in advance. The purpose is to provide a household distribution board that can be used.

[0004]

According to the present invention, an overload detecting device is connected to the secondary side of each branch circuit wiring breaker, and the secondary side of the main wiring breaker and the branch circuit are connected. An alarm circuit and operating contacts of the respective overload detection devices are connected in parallel to the main circuit between the primary side of the circuit breaker for wiring and the serial connection.

[0005]

By connecting as described above, the overload detection device on the secondary side of the circuit breaker for branch circuit operates faster than the overload trip device for the circuit breaker for branch circuit,
An alarm is activated by operating the alarm circuit with the operating contact of the overload detection device. As a result, the user can be notified of an overload of power by an alarm, and the overload trip device of the breaker for the branch circuit wiring of the corresponding branch circuit operates, and before the power failure occurs, an appropriate load limit is applied. It can be performed.

[0006]

Embodiments of the present invention will be described below with reference to FIG. In FIG. 1, an overload detection device 6 is connected to the secondary side of each branch circuit wiring circuit breaker 2,
From the secondary side of the main wiring breaker 1 to the wiring branched from the main circuit 3 between the primary side of the branch circuit wiring breaker 2
An alarm circuit 7 including a fuse 4 and a buzzer 5 is connected in series. Further, the operation contacts 6a of the overload detection device 6 of each branch circuit 4 are connected in parallel, and are connected in series to the alarm circuit 7, and one end thereof is connected to the main circuit 3. The overload detection established value of the overload detection device 6 is selected as a settling value that operates faster than the overload trip device of the circuit breaker 2 for the branch circuit wiring.

In the household distribution board thus constructed, when the branch circuit 4 uses more than the rated power of the branch circuit wiring breaker 2, the overload detection device 6 operates as follows.
The branch circuit wiring breaker 2 operates faster than the overload trip device, and the operating contact 6a of the overload detection device 6 activates the buzzer 5 of the alarm circuit 7 to give an alarm. As a result, the user can be informed of the overload of electric power, and the overload trip device of the branch circuit wiring breaker 2 of the corresponding branch circuit 4 operates and an appropriate load limitation is performed before a power failure occurs. It is possible to prevent a power outage. Although the alarm circuit 7 is composed of the fuse 4 and the buzzer 5 in the above-described embodiment, another structure may be used as long as it can notify the user of the electric power overload.

[0008]

As described above, according to the present invention, by notifying the user of the overload of the power of the branch circuit by the alarm, it is possible to appropriately limit the load and prevent the power failure. can do.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention.

FIG. 2 is a double-track connection diagram showing a conventional example.

[Explanation of symbols]

 1 Main circuit wiring breaker 2 Branch circuit wiring circuit breaker 3 Main circuit 4 Branch circuit 6 Overload detection device 6a Overload detection device operating contact 7 Alarm circuit

Claims (1)

[Claims] 1. A home circuit comprising: a main circuit provided with a main circuit breaker; and a plurality of branch circuits connected to the main circuit and provided with branch circuit wiring circuit breakers, respectively. In a household distribution board for protecting the power system, the secondary side of each of the branch circuit wiring circuit breaker, respectively connected to the overload detection device, the secondary side of the main wiring circuit breaker and the The main circuit between the primary side of the circuit breaker for branch circuit wiring and the operating contacts of the overload detection devices connected in parallel to the main circuit are connected in series. Power distribution board.