Four-pole low voltage circuit breaker
AssigneeMerlin Gerin
InventorMarc Bur
Life of this patent
Estimating the term…
Abstract
A four-pole circuit breaker has an operating mechanism associated with one of the intermediate main poles, so as to take up an asymmetrical position with respect to the layout of the four poles. The mechanism has springs similar to those of a three-pole breaker. The transverse tie bar is common to the three main poles and is mechanically coupled to a kinetic linkage controlling the fourth pole, so as to bring about the closure of the contacts of the fourth pole before the closure of the contacts of the main poles upon closing of the breaker, in order to match the four-pole load torque to the three-pole motor torque of the mechanism.
Claims5
A four-pole low-voltage circuit breaker comprising:
- three main poles, consisting of one center pole and two adjacent outer poles, and a fourth adjacent neutral pole, each pole having a stationary contact and a contact arm structure carrying a movable contact thereon and being movable between open and closed positions,
- an operating mechanism associated with said center main pole so as to occupy an asymmetrical position with respect to the layout of the four poles, and including a transverse tie bar extending across all the three main poles and supporting the movable contact arm structures of the three main poles,
- and a kinetic linkage means connected between the movable contact arm structure of said fourth pole and said tie bar so as to bring about the closure of the contacts of the fourth pole before that of the contacts of the three main poles during the closing of the breaker, and to adapt the four-pole load torque to the three-pole motor torque of the operating mechanism.
Dependencies are inferred from the claim text.