CIRCUIT INTERRUPTERS WITH LOCKOUT FEATURE AND RELATED METHODS

• US 20200136365A1
• Filed: 10/29/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Inventors: Courson, Andrew William, Okerman, Jason Kohei
• Granted Patent: US 11,398,363 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 31/327 Testing of circuit interrupters, switches or circuit-breakers
• CPC Class Codes: G01R 31/3278 of relays, solenoids or reed switches measuring contact resistance G01R27/205; high voltage magnetic switches G01R31/3271, G01R31/333; testing electric windings G01R31/72; monitoring of fail safe circuits H01H47/002
• CPC Class Codes: G01R 31/50 Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections testing of sparking plugs H01T13/58
• CPC Class Codes: H01H 2071/044 Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
• CPC Class Codes: H01H 71/0207 Mounting or assembling the different parts of the circuit breaker
• CPC Class Codes: H01H 71/10 Operating or release mechanisms
• CPC Class Codes: H01H 71/1054 Means for avoiding unauthorised release
• CPC Class Codes: H01H 85/30 Means for indicating condition of fuse structurally associated with the fuse
• CPC Class Codes: H01H 9/104 with interlocking mechanism between switch and fuse
• CPC Class Codes: H02H 1/0015 Using arc detectors

Abstract

Circuit breakers are disclosed that include a housing with a line side and a load side, a printed circuit board in the housing, a movable contact arm with an electrical contact, a stationary line side contact, a primary trip solenoid in the housing coupled to the printed circuit board, an armature in the housing, a bimetal member in the housing adjacent the armature and adjacent the primary trip solenoid; and a lockout assembly in the housing. The lockout assembly includes a rod configured to have a first inactive position and a second lockout position. When in the second position and/or as the rod travels to the second lockout position, the rod directly or indirectly pushes the armature toward the bimetal member to physically lock out the circuit breaker to prevent conduction and separate the line side contact from the movable contact arm electrical contact.

Claims

1. A circuit breaker, comprising:

a housing with a line side and a load side;

a printed circuit board in the housing;

a movable contact arm with an electrical contact;

a stationary line side electrical contact;

a primary trip solenoid in the housing coupled to the printed circuit board;

an armature in the housing;

a bimetal member in the housing adjacent the armature and adjacent the primary trip solenoid; and

a lockout assembly in the housing, the lockout assembly comprising a rod configured to have a first inactive position and a second lockout position, wherein, only when in the second lockout position and/or as the rod travels to the second lockout position, the rod directly or indirectly pushes the armature toward the bimetal member to physically lock out the circuit breaker to prevent conduction and separate the line side electrical contact from the movable contact arm electrical contact.

2. The circuit breaker of claim 1, wherein the lockout assembly comprises a control device that anchors the rod in the first position, pre-installation and during in service operation, and wherein the control device is configured to allow the rod to slidably advance only a single time to the second lockout position in response to an electronically automatically identified end-of-life condition.

3. The circuit breaker of claim 2, further comprising a resilient biasing member that cooperates with the rod, wherein the resilient biasing member is configured to have a compressed state when the rod is in the first position to have stored potential energy, and wherein the resilient biasing member is configured to apply the stored potential energy to the rod when released by the control device to force the rod to slidably travel to the second lockout position.

4. The circuit breaker of claim 2, wherein the control device comprises a component that allows electric current above a defined threshold to fuse open the component and release the rod.

5. The circuit breaker of claim 1, wherein the rod comprises a leading end that faces the armature, and wherein the leading end is perpendicular to a primary body segment of the rod.

6. The circuit breaker of claim 5, wherein the leading end extends through an aperture in the printed circuit board adjacent a plunger of the primary trip solenoid.

7. The circuit breaker of claim 6, wherein the primary trip solenoid comprises a plunger and/or flag that has a leading end that is perpendicular to a primary body of the primary trip solenoid, and wherein the leading end extends through the aperture or a different aperture in the printed circuit board adjacent the leading end of the rod.

8. The circuit breaker of claim 1, wherein the rod comprises a leading end that faces the armature, wherein the leading end is perpendicular to a primary body segment of the rod and is also perpendicular to an axis of translation of a plunger of the primary trip solenoid, behind a leading end of the plunger, and wherein the leading end of the rod forces the leading end of the plunger and/or a flag thereon to move forward as the leading end of the rod moves to the second lockout position.

9. The circuit breaker of claim 1, wherein the rod is held by a middle base of the housing.

10. The circuit breaker of claim 9, wherein the middle base comprises a first aperture that allows a flag of a plunger to extend therethrough, and wherein the middle base comprises a second aperture that allows a leading end of the rod to extend therethrough adjacent the flag of the plunger.

11. The circuit breaker of claim 1, wherein the middle base comprises an aperture that allows a flag of a plunger to extend therethrough and that also allows a leading end of the rod to concurrently extend therethrough adjacent the flag of the plunger.

12. The circuit breaker of claim 1, wherein the rod is held by a top cover of the housing.

13. The circuit breaker of claim 1, wherein the rod is held by the printed circuit board.

14. The circuit breaker of claim 1, wherein the rod is held by a bottom cover of the housing.

15. The circuit breaker of claim 1, wherein the rod is coupled to an external casing of the primary trip solenoid.

16. The circuit breaker of claim 1, wherein the circuit breaker is an Arc Fault Circuit Interrupter (AFCI), a Ground Fault Circuit Interrupter (GFCI) or a dual purpose AFCI/GFCI circuit breaker.

17. The circuit breaker of claim 1, further comprising a coil spring coupled to the rod and a control device coupled to the rod, spaced apart from a leading end of the rod, and wherein the control device comprises a fusible wire or fusible polymer or plastic link that is attached to the rod in the first inactive position.

18. The circuit breaker of claim 1, further comprising a control circuit in communication with a control device that is coupled to the rod, wherein the control circuit is configured to trigger the control device to provide to controllably deploy the rod of the lock-out assembly to the second lockout position only when an end of life condition is identified, optionally based on one or more of:

a defined number of successive failed self-tests of a self-test circuit onboard the circuit breaker;

an identified failure or degradation in a defined performance parameter or parameters of electronic components in the circuit breaker;

AFCI or GFCI protection features are at least one of inoperable, outside defined operating parameters or malfunctioning;

or

solenoid or SCR (silicon controlled rectifier) components of a primary electronic trip path are shorted, burned or otherwise damaged.

19. A method of operating a current interrupter comprising:

providing a circuit interrupter with a permanent lockout assembly;

electronically monitoring or testing or monitoring and testing for defined end-of-life conditions or events of the circuit interrupter; and

automatically deploying a rod of a lock out assembly to slide toward an armature and push the armature toward a bimetal member to permanently block conduction of the circuit interrupter.

20. The method of claim 19, wherein the deployment of the rod of the lock-out assembly is carried out a single time and only when an end of life condition is identified, and wherein the monitoring or testing or monitoring and testing for the defined end-of-life conditions or events comprises one or more of electronically:

determining a defined number of failures of successive self-tests of a self-test circuit;

identifying a failure or degradation in a defined performance parameter or parameters of electronic components in the circuit interrupter;

determining that AFCI or GFCI protection features are inoperable, outside defined operating parameters or malfunctioning;

or

determining that a primary trip solenoid or SCR (silicon controlled rectifier) component of a primary electronic trip path is shorted, burned or otherwise damaged.