Retrofit CAFI/GFI remote control module

Patent metadata

Field	Value
Publication number	US-10115552-B2
Application number	US-201514969501-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 15, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A retrofit CAFI/GFI remote control module may provide dual function protection for simple thermal-magnetic circuit breakers in a residential load center with arc fault and ground fault protection. The module provides line sensors and electronic processing to detect ground faults or arc faults, or both, and operates a bistable relay between the branch breaker and the load to open the circuit, which can then be remotely or manually reset.

First claim

What is claimed is:

1. A retrofit remote control module providing a simple thermal-magnetic circuit breaker with arc fault or ground fault, or both, sensing and interruption capabilities for a branch circuit, comprising:
a case housing a current path with neutral and line conductors,
line sensors for sensing current flow within the current path,
electronics connected to the line sensors to determine anomalies in the sensed current flow, and
a bistable relay in the current path between the simple thermal-magnetic circuit breaker and the load, the relay being operated by said electronics to open the branch circuit; and
connectors for attaching the neutral and line conductors to a branch circuit on a downstream side of the module, and attaching the neutral and line conductors to the load side of the simple thermal-magnetic circuit breaker on an upstream side of the module.

2. The retrofit remote control module of claim 1 wherein the electronics include a microprocessor for determining the occurrence of series arcs.

3. The retrofit remote control module of claim 1 wherein the electronics include a microprocessor for determining the occurrence of parallel arcs.

4. The retrofit remote control module of claim 1 wherein the electronics include a microprocessor for determining the occurrence of ground faults.

5. The retrofit remote control module of claim 1 wherein the bistable relay is electromechanically operated.

6. The retrofit remote control module of claim 1 wherein the module has a push to test button for testing the operation of the bistable relay.

7. The retrofit remote control module of claim 1 wherein the module has a manual reset button extending from the case for closing the bistable relay.

8. The retrofit remote control module of claim 1 further comprising a communications link for receiving remote instructions to close the bistable relay.

9. The retrofit remote control module of claim 1 wherein the case is sealed/weatherproof.

10. The retrofit remote control module of claim 1 wherein the module is contained inside a load center and is connected to a circuit breaker within the load center.

Assignees

• Schneider Electric Usa Inc

Inventors

• Mittelstadt Chad R

Classifications

• H01H2223/002

  sealed · CPC title

• H01H71/40

  Combined electrothermal and electromagnetic mechanisms · CPC title

• H01H71/128 Primary

  Manual release or trip mechanisms, e.g. for test purposes (two similar push buttons for closing or resetting and opening or tripping H01H71/58; test switches for earth fault circuit breakers H01H83/04) · CPC title

• H01H83/144 Primary

  with differential transformer · CPC title

• H01H2089/005

  Multi-purpose combinations, e.g. LS/DI, LS/FI, of normal protective circuit breakers with known other forms of protection, e.g. earthfaults, differential, imbalance · CPC title