# US 4,395,602 A · Isolation shield for circuit breaker compartment secondary disconnects

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- Number: US 4,395,602 A
- Document ID: US4395602A
- Status: Granted
- Kind: A
- Application number: 06/349,333
- Filed: 1982-02-16
- Granted: 1983-07-26
- Earliest claimed: 1982-02-16
- Assignees: General Electric Company
- Inventors: Roger N. Castonguay
- Web page: https://patentgrep.com/patent/US4395602A

## CPC

- H02B 11/24: Shutters or guards
- H02B: BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER

## Abstract

A slideably mounted insulating shield is positioned over the terminals of a secondary disconnect attached to the side wall of a circuit breaker compartment. Inserting the circuit breaker into the compartment brings the secondary disconnect terminals on the breaker into engagement with the secondary disconnect terminals in the compartment by displacing the insulating shield. Removal of the breaker from the compartment forces the insulating shield to return to position over the compartment secondary disconnect terminals thereby isolating the disconnect terminals from inadvertent contact with an operator.

## Claims

### Claim 1

An insolation shield assembly in combination with circuit breaker compartment secondary disconnects within a circuit breaker compartment which contains a primary and a secondary source of current comprising:
an electrically insulating shield in superposed relation to a plurality of circuit breaker compartment secondary disconnect terminals connnected with said secondary current source for isolating said compartment terminals when a circuit breaker is removed from said compartment; and means for moving said shield out of superposed relation to said compartment terminals for exposing said compartment terminals to a corresponding plurality of secondary disconnect terminals on said circuit breaker and for connecting said circuit breaker terminals when said circuit breaker is inserted within said compartment.

### Claim 2 (depends on 1)

The combination of claim 1 wherein said moving means includes at least one moveable link pivotally connected between said shield and a bottom plate.

### Claim 3 (depends on 2)

The combination of claim 2 further including at least one return spring connecting between said moveable link and said bottom plate for returning said shield to superposed relation to said compartment secondary disconnect terminals when said circuit breaker is removed from said compartment.

### Claim 4 (depends on 3)

The combination of claim 3 including a pair of top plates, one on either side of said shield for providing support means to said shield.

### Claim 5 (depends on 4)

The combination of claim 4 further including a cross plate connecting between said pair of top plates for providing further support to said shield.

### Claim 6 (depends on 2)

The combination of claim 2 wherein said bottom plate includes means defining an opening for positioning said shield over said breaker compartment secondary disconnect terminals.

### Claim 7 (depends on 5)

The combination of claim 5 wherein said moveable link loosely connects between said bottom plate and said cross plate whereby contact with said shield by said circuit breaker causes said moveable link to rotate in a clockwise direction against the force provided by said return spring.

### Claim 8

A circuit breaker compartment comprising, in combination:
a closure for receiving a circuit breaker;
a plurality of line and load stabs extending from a rear portion of said closure for mating with a corresponding plurality of line and load receivers extending from a rear portion of a circuit breaker;
a plurality of compartment secondary disconnect terminals attached to a side wall of said closure for mating with a corresponding plurality of circuit breaker secondary disconnect terminals on a side portion of said circuit breaker; and
a slideably mounted shield assembly attached to said closure side wall for isolating said compartment secondary disconnect terminals when said circuit breaker is moved at least partially out of said compartment.

### Claim 9 (depends on 8)

The compartment of claim 8 wherein said shield assembly comprises:
an insulating shield extending between a pair of top plates, one on either side of said insulating shield;
a pair of moveable links pivotally connected on either side of said insulating shield between a bottom plate and said top plates for moving said insulating shield out of superposition with said compartment secondary disconnect terminals upon contact wih an insulating support on said circuit breaker secondary disconnect terminals; and
spring means connecting between said bottom plate and said moveable links for providing return motive force for returning said insulating shield to superposition with said compartment secondary disconnect terminals when said insulating support no longer contacts said shield.