Low voltage switch pole

Patent metadata

Field	Value
Publication number	US-12362113-B2
Application number	US-202217982744-A
Country	US
Kind code	B2
Filing date	Nov 8, 2022
Priority date	Nov 8, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A switch pole for a low voltage switching device including an insulating casing defining an internal space with a contact area and an arc extinguishing area of said switch pole, a fixed contact assembly and a movable contact assembly positioned in said contact area and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled, and an arc chamber positioned in said arc extinguishing area and including a plurality of parallel arc-breaking plates and a terminal arc-breaking element, which includes a plate portion arranged in parallel to said arc-breaking plates and having one or more through openings and an elongated portion protruding from said plate portion and extending across said arc-extinguishing area, from said plate portion towards said fixed contact assembly.

First claim

What is claimed is:

1. A switch pole for a low voltage switching device comprising:
an insulating casing defining an internal space with a contact area and an arc extinguishing area of the switch pole;
a fixed contact assembly and a movable contact assembly positioned in the contact area and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled; and
an arc chamber positioned in the arc extinguishing area and comprising a plurality of arc-breaking elements, wherein the arc-breaking elements comprise a plurality of parallel arc-breaking plates and a terminal arc-breaking element, the terminal arc-breaking element is arranged in distal position from the fixed contact assembly compared to the arc-breaking plates,
wherein the terminal arc-breaking element comprises a plate portion, which is arranged in parallel to the arc-breaking plates and has one or more through openings, and an elongated portion, which protrudes from the plate portion and extends across the arc-extinguishing area, from the plate portion towards the fixed contact assembly, and
wherein the insulating casing comprises an insulating wall partially separating the contact area from the arc extinguishing area in distal position from the fixed contact assembly, a terminal edge of the insulating wall abuts the elongated portion and a lower edge of the plate portion.

2. The switch pole according to claim 1 , wherein the insulating casing has opposite front and rear walls, wherein the terminal arc-breaking element-is arranged at the front wall, wherein the fixed contact assembly is arranged at the rear wall, and wherein the arc-breaking plates are arranged at subsequent positions between the front wall and the rear wall.

3. The switch pole according to claim 1 , wherein the terminal arc-breaking element is arranged in proximal position to the contact area compared to the arc-breaking plates.

4. The switch pole according to claim 1 , wherein the elongated portion protrudes from the plate portion at the lower edge of the plate portion, which is in proximal position to the contact area.

5. The switch pole according to claim 1 , wherein the elongated portion has a first end joined to the plate portion and a second free end, which is curved towards the contact area.

6. The switch pole according to claim 5 , wherein the second free end of the elongated portion protrudes from the insulating wall, so as to be exposed directly to the contact area.

7. The switch pole according to claim 6 , wherein the insulating wall is integral with a front wall and opposite lateral walls of the insulating casing and extends from the front wall towards the fixed contact assembly.

8. The switch pole according to claim 1 , wherein the plate portion comprises a plurality of openings formed by a pair of slots arranged in parallel to corresponding lateral edges of the plate portion and arranged symmetrically relative to the elongated portion.

9. The switch pole according to claim 1 , wherein the arc chamber comprises an insulating enclosure that can be removably fixed to the insulating casing, and wherein the arc-breaking elements are fixed to the insulating enclosure.

10. The switch pole according to claim 1 , wherein the terminal arc-breaking element is leaning on the insulating wall.

11. The switch pole according to claim 10 , wherein the insulating wall is integral with a front wall and opposite lateral walls of the insulating casing and extends from the front wall towards the fixed contact assembly.

12. The switch pole according to claim 10 , wherein a second free end of the elongated portion protrudes from the insulating wall, so as to be exposed directly to the contact area.

13. A low voltage switching device, wherein the low voltage switching device comprises a switch pole according to claim 1 .

Assignees

• Abb Spa

Inventors

• Arrighetti Pierantonio
• Corfdir Pierre
• Abplanalp Markus
• Suetterlin Ralf-Patrick

Classifications

• H01H33/64

  wherein the break is in gas (vacuum switches H01H33/66) · CPC title

• H01H2009/348

  Provisions for recirculation of arcing gasses to improve the arc extinguishing, e.g. move the arc quicker into the arcing chamber · CPC title

• H01H9/362

  Mounting of plates in arc chamber · CPC title

• H01H9/36

  Metal parts · CPC title

• H01H9/342

  Venting arrangements for arc chutes · CPC title