GB2288281A - Undervoltage release accessory - Google Patents
Undervoltage release accessory Download PDFInfo
- Publication number
- GB2288281A GB2288281A GB9505986A GB9505986A GB2288281A GB 2288281 A GB2288281 A GB 2288281A GB 9505986 A GB9505986 A GB 9505986A GB 9505986 A GB9505986 A GB 9505986A GB 2288281 A GB2288281 A GB 2288281A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- solenoid
- undervoltage release
- release accessory
- accessory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H2083/208—Converting under voltage release [UVR] and shunt release
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
- H01H2300/042—Application rejection, i.e. preventing improper installation of parts
Landscapes
- Breakers (AREA)
Abstract
An undervoltage release accessory for a circuit breaker comprises a plastic cover 2, a solenoid 4 captured within the cover 2 by fingers 8 extending from the cover 2, a plunger 11 within the solenoid 4 extending through an opening at one end of the cover 2 and a spring 10 surrounding the plunger 11 and trapped between an end of the solenoid 4 and a side of the cover 2. <IMAGE>
Description
UNDERVOLTAGE RELEASE ACCESSORY
This invention relates to undervoltage release accessories.
The present invention provides a set of molded case accessory housings that can provide mounting means for solenoids, and printed wiring boards. The housing may provide a guide for installation and a rejection scheme for installation of the correct accessory in the appropriate compartment. The electrical interface may be configured using a plug-in connector and the module secured to the compartment by a captured mounting screw.
Accessories have been provided for circuit breakers for various functions such as Under Voltage Release, Shunt
Trip, Bell Alarm and Lockout functions. The norm had been open-framed devices until the introduction of the molded case accessory, as described, for example, in US-A-4297663, that describes a thermoplastic housing for mounting various components. From there the state of the art advanced to combination accessories with molded housings as described, for example, in US-A-4408174. Solid state electronics have been added to accessories in recent disclosures and have further enhanced the precision of trip points.
According to the present invention an undervoltage release accessory comprises a plastic cover; an opening at one end of the cover; a solenoid positioned at one end of the cover and arranged such that a plunger within the solenoid extends through the opening; a spring surrounding said plunger and trapped between an end of the solenoid and a side of the cover; and side means extending from the cover and capturing one end of said solenoid within said cover. The side means conveniently comprises a pair of fingers integrally-formed within the cover.
The device may further include end means extending from the covering capturing an opposite end of the solenoid within the cover.
The accessory may include a printed wire board arranged over the cover and containing a control circuit for operating the solenoid.
The accessory may include a plastic case attached to the cover over the printed wire board, to form a closed rectangular unit, one end of the unit having grooves formed therein for accepting a removal tool.
The accessory may include a rejection stud extending from an opposite side of the rectangular unit, the rejection stud being received within a corresponding opening in a circuit breaker enclosure.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, of which:
FIGURE 1 is a diagrammatic, exploded, front perspective view of the modular shunt trip and or undervoltage housing configuration;
FIGURE 2 is a diagrammatic end view of the case and cover of Figure 1 as assembled; and
FIGURE 3 shows a diagrammatic partial side view of the embodiment of Figure 1.
The housing in Figures 1 and 2 is comprised of a rectangular molded case 1 with four mounting posts 5 that support a printed wire board 3 and provide a means to engage cover screws 7 shown in Figure 2. A cover 2 (Figure 1) houses a solenoid 4 used in the undervoltage release device. The solenoid 4 snaps in place forcing fingers 8 to separate in the process. The cover 2 material is a compliant thermoplastic material that provides the spring force to hold the solenoid firmly in place. End clamps 9 force the solenoid 4 against the back surface of the fingers 8 to precisely locate the solenoid 4 in said cover 2. A spring 10 moves a plunger and end cap 11 to rest against the cover 2.
In the undervoltage device the solenoid 4 is normally powered and a plunger and cap 11 are held in against the spring 10. This undervoltage system uses an electronic printed wiring board circuit 3 to determine when to trip the circuit breaker and a signal is sent to the main electronic circuit breaker trip unit and a trip is initiated.
When a loss of power occurs or the power dips below a predetermined value with the circuit breaker OFF or TRIPPED the solenoid 4 releases the plunger and cap 11 whereupon it is forced against the cover 2. Mechanical linkages, not shown, prevent the circuit breaker from being turned ON.
In the case of the shunt trip and electronic printed wiring board circuit 3 determines when to trip and issues a trip signal to the main electronic printed wiring board circuit 3 determines when to trip and issues a trip signal to the main electronic circuit breaker trip unit. The solenoid is not required for the shunt trip device.
A rejection stud 12 is used to key the specific device to a compartment location. The rejection stud 12 cooperates with a hole in the bottom of the compartment to provide a rejection if the wrong device is attempted to be installed in the wrong pocket. One rejection stud 12 is cut off for the shunt trip and the second is cut off for the undervoltage device providing a unique device from a common housing.
The device is held in place in the circuit breaker with a long mounting screw 13 that is guided through the housing 2 and cooperates with a tapped hole in the circuit breaker compartment.
Under cut slots 14 (that are more fully seen in Figure 3) are used for extracting the device from the circuit breaker and are sized to use an ordinary IC extraction tool.
Figure 2 shows the undervoltage device assembled with the cover 2 attached to the case 1 using screws 7 that cut a thread in the support 5. The printed wiring board 3 is sandwiched between the cover 1 and cover 2 by the support 5 and the support 6.
Claims (7)
1. An undervoltage release accessory comprising:
a plastic cover;
an opening at one end of the cover;
a solenoid positioned at one end of the cover and arranged such that a plunger within the solenoid extends through the opening;
a spring surrounding said plunger and trapped between an end of the solenoid and a side of the cover; and
side means extending from the cover and capturing one end of said solenoid within said cover.
2. The undervoltage release accessory of claim 1 wherein said means comprises a pair of fingers integrallyformed within the cover.
3. The undervoltage release accessory of claim 1 further including end means extending from the cover and capturing an opposite end of said solenoid within said cover.
4. The undervoltage release accessory of claim 1 including a printed wire board arranged over said cover and containing a control circuit for operating said solenoid.
5. The undervoltage release accessory of claim 4 including a plastic case attached to said cover over said printed wire board, to form a closed rectangular unit, one end of said unit having grooves formed therein for accepting a removal tool.
6. The undervoltage release accessory of claim 5 including a rejection stud extending from an opposite end of said rectangular unit, said rejection stud being received within a corresponding opening in a circuit breaker enclosure.
7. An undervoltage release accessory substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9505986A GB2288281B (en) | 1994-04-08 | 1995-03-24 | Undervoltage release accessory |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9406941A GB9406941D0 (en) | 1994-04-08 | 1994-04-08 | Molded case accessory housings |
| GB9505986A GB2288281B (en) | 1994-04-08 | 1995-03-24 | Undervoltage release accessory |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9505986D0 GB9505986D0 (en) | 1995-05-10 |
| GB2288281A true GB2288281A (en) | 1995-10-11 |
| GB2288281B GB2288281B (en) | 1998-02-11 |
Family
ID=26304660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9505986A Expired - Fee Related GB2288281B (en) | 1994-04-08 | 1995-03-24 | Undervoltage release accessory |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2288281B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2757674A1 (en) * | 1996-12-23 | 1998-06-26 | Schneider Electric Sa | Fixture for auxiliary element on equipment, esp. circuit breakers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB594847A (en) * | 1945-07-02 | 1947-11-20 | Callenders Cable & Const Co | Improvements in electric switches adapted to be tripped open |
-
1995
- 1995-03-24 GB GB9505986A patent/GB2288281B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB594847A (en) * | 1945-07-02 | 1947-11-20 | Callenders Cable & Const Co | Improvements in electric switches adapted to be tripped open |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2757674A1 (en) * | 1996-12-23 | 1998-06-26 | Schneider Electric Sa | Fixture for auxiliary element on equipment, esp. circuit breakers |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9505986D0 (en) | 1995-05-10 |
| GB2288281B (en) | 1998-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040324 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040324 |