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Under-voltage tripping device with early-operation auxiliary switch for circuit breaker

Imported: 23 Feb '17 | Published: 22 Oct '02

Masao Miura, Koji Asakawa

USPTO - Utility Patents

Abstract

An under-voltage tripping device installed on a main body of a circuit breaker includes an electromagnetic under-voltage tripping mechanism; an early-operation auxiliary switch for switching a conductive path of an electromagnet of the electromagnetic under-voltage tripping mechanism in connection with a handle mechanism of the circuit breaker; and a unit case having two opposite ends and external connection terminals at the two opposite ends thereof. The unit case is shaped to fit an outward frame of the main body. The wiring circuits for the electromagnet and the early-operation auxiliary switch are separated from each other in the unit case. The early-operation auxiliary switch is connected between the external connection terminals of the unit case, and the electromagnet has leads emerging directly from the unit case and connected to an external wiring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS.

1(

a)-

1(

c) are views showing a configuration of an under-voltage tripping device with an early-operation auxiliary switch corresponding to an embodiment of the present invention, wherein FIG.

1(

a) is a front view of an internal structure of the under-voltage tripping device in combination with a circuit breaker, FIG.

1(

b) is a side view thereof, and FIG.

1(

c) is a plan view thereof;

FIGS.

2(

a)-

2(

c) are views showing a configuration of an under-voltage tripping device with an early-operation auxiliary switch corresponding to another embodiment of the present invention, wherein FIG.

2(

a) is a front view of an internal structure thereof, FIG.

2(

b) is a side view thereof, and FIG.

2(

c) is a plan view thereof;

FIG. 3 is a side view of an internal structure of an under-voltage tripping device with an early-make auxiliary switch corresponding to another embodiment of the present invention, in which units of the device are piled together;

FIGS.

4(

a)-

4(

c) are detailed views of the structure of unit I in FIG. 3, wherein FIGS.

4(

a) to

4(

c) are a front view, a side view, and a plan view, respectively, of the structure;

FIGS.

5(

a)-

5(

c) are detailed views of the structure of unit II in FIG. 3, wherein FIGS.

5(

a) to

5(

c) are a front view, a side view, and a plan view, respectively, of the structure;

FIG. 6 is a schematic view of a configuration of a circuit breaker to which the under-voltage tripping device of the present invention is to be applied;

FIG. 7 is a detailed view of a structure of a set opening-and-closing mechanism in FIG. 6;

FIG. 8 is a plan view showing a conventional standard under-voltage tripping device with an early-operation auxiliary switch that is installed in a circuit breaker;

FIG. 9 is a front view of the internal structure of the under-voltage tripping device in FIG. 8;

FIG. 10 is a wiring diagram showing a general wiring method for an under-voltage tripping device with an early-operation auxiliary switch that is attached to a circuit breaker;

FIG. 11 is a wiring diagram showing a wiring method different from that in FIG. 10; and

FIG. 12 shows an internal structure of a conventional under-voltage tripping device with an early-operation auxiliary switch that has been manufactured in accordance with the wiring method shown in FIG.

11.

Claims

1. An under-voltage tripping device installed on a circuit breaker with a handle mechanism, comprising:

2. An under-voltage tripping device according to claim 1, further comprising a terminal block installed on a side of the unit case, said leads of the electromagnet being connected to the external wiring through the terminal block.

3. An under-voltage tripping device according to claim 1, wherein said unit case includes a first casing containing the electromagnetic under-voltage tripping mechanism, and a second casing containing the early-operation auxiliary switch and fixed adjacent to the first casing.

4. An under-voltage tripping device according to claim 3, wherein said first casing includes additional terminals to be connected to the leads of the electromagnet.

5. An under-voltage tripping device installed on a circuit breaker with a handle mechanism, comprising: