EP1075702A1 - Relay - Google Patents

Relay

Info

Publication number
EP1075702A1
EP1075702A1 EP99947052A EP99947052A EP1075702A1 EP 1075702 A1 EP1075702 A1 EP 1075702A1 EP 99947052 A EP99947052 A EP 99947052A EP 99947052 A EP99947052 A EP 99947052A EP 1075702 A1 EP1075702 A1 EP 1075702A1
Authority
EP
European Patent Office
Prior art keywords
locking means
relay
armature
locking
contacts
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
Application number
EP99947052A
Other languages
German (de)
French (fr)
Other versions
EP1075702B1 (en
Inventor
Bengt Almquist
Stefan KJELLNÄS
smund KLEMMESTAD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB AB
Original Assignee
ABB AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB AB filed Critical ABB AB
Publication of EP1075702A1 publication Critical patent/EP1075702A1/en
Application granted granted Critical
Publication of EP1075702B1 publication Critical patent/EP1075702B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/32—Latching movable parts mechanically
    • H01H50/326—Latching movable parts mechanically with manual intervention, e.g. for testing, resetting or mode selection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
    • H01H9/281—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member making use of a padlock
    • H01H9/282—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member making use of a padlock and a separate part mounted or mountable on the switch assembly and movable between an unlocking position and a locking position where it can be secured by the padlock

Definitions

  • the invention concerns the technical field of low voltage switchgear and control gear for industrial use.
  • it concerns mechanical contactors, sometimes described and in the following called relays, used for switching on and off electrical equipment such as electric motors.
  • relays It is common practice to use relays to switch industrial electrical equipment on and off.
  • One such series of relays is illustrated in a brochure from ABB Control called CONTACTORS.
  • a range of relays is illustrated including models for use with electric motors ranging in power from 2.2 kW at 220V AC up to 315V at 1000V AC.
  • a requirement that arises with electrical equipment is that it may be secured in the off position. This is required for example for maintenance access to equipment. In many instances it can be damaging to equipment or dangerous for operators if the equipment were to be switched on before the maintenance were complete. Isolators which isolate the equipment from an electrical supply or circuit breakers are frequently used for this purpose.
  • a circuit breaker may for example be set in the open position and a lever on the outside of the case locked in the open position with a padlock. However there is often only 2
  • US 3745492 describes an electromagnetic contactor.
  • a mechanical latch mechanism 16 is also described, fitted to a sideways-extending part of the baseboard on one side of the contactor. This latch may be locked in a locking position with a padlock.
  • the latch includes seven metal parts, one slide member 168, two of coil springs 186, two of retaining pins 188, and two upright supports 170, 172 assembled together, fastened together by, for example, spot-welding, which latch assembly is then screwed or riveted to the baseboard.
  • Latch mechanism 16 does not include a means for electrical disconnection of the coil excitation current.
  • the object of the invention is to provide an improved mechanical contactor or relay that also functions as an 3
  • a locking means on the front of the relay cover for co-operation with the armature in the open contacts position such that the armature is lockable in the open position.
  • the locking means When the contacts are in the open position, the locking means is moveable into a locked position. In the locked position, the locking means mechanically locks the armature inside the relay in the open position (off position) so that the relay cannot be moved to the closed position (on position) .
  • the locking means is secured in the locked position with a lock. The locking means can only be moved into the locked position when the main contacts are in the open position.
  • the locking means includes a electrical switch that disconnects the coil excitation current when the locking means is in the locked position.
  • a further embodiment of the locking means prevents the relay from being moved to the closed position by co-operating with the magnets.
  • the advantages of the invention include that it may be used as a substitute for a separate isolating device in some applications.
  • the invention thus economically serves as both a relay and an isolator in some applications.
  • the relay is very compact and requires a minimum of space for mounting it.
  • When a relay is locked according to the invention that condition is visibly and unambiguously indicated on the front of the relay cover. Even when a row of similar relays are mounted side by side, it is obvious which relay is locked by a padlock cooperating with a locking means according to the present invention.
  • the invention is also economic to manufacture and simple to use and contributes to the safe use of equipment. 4
  • Figure 1 shows schematically an external view of a relay with a locking means according to the invention.
  • Figure 2 shows a view of parts of a relay with locking means according to the invention.
  • Figure 3 shows a external view of a relay with a locking means according to the invention.
  • Figure 4 shows an external view of a relay with another embodiment of the locking means according to the invention.
  • Figure 5 shows a view of parts of a relay with a another embodiment of the locking means according to the invention.
  • a relay of the contactor type consists of moveable contacts arranged on an armature, fixed contacts, a coil and magnets.
  • the armature moves from an open position to a closed position.
  • Such a relay is normally arranged with one resting position only, which is in the open position.
  • Relays are usually mounted on a backplate 2, normally enclosed in a cover 1 with only the end of the armature and the connection pieces 3 visible from the outside, as shown in Figures 1, 4.
  • the invention comprises a locking means 4 with a first locking device, for example a sliding pin or a moving rod 6 which is arranged on the outside of the front of the relay cover 1 in a plane substantially parallel with backplate 2.
  • a second locking device such as a recess or passageway 11 is arranged on the armature 10 as shown in Figure 2.
  • the first locking 5 is arranged on the first locking 5
  • the device is arranged in the locking means 4 on the front of relay cover 1 such that it can co-operate with the recess in the armature and lock the armature when it is in the open position.
  • the locking means 4 is arranged with tags 7, 8 comprising passageways such that a lock or a padlock 9 is used to secure the relay in the locked position.
  • tags 7, 8 comprising passageways such that a lock or a padlock 9 is used to secure the relay in the locked position.
  • the armature 10 shown in Figure 2 is arranged with second locking device such as a recess 11 positioned adjacent to an passageway 5 in the relay cover 1.
  • a locking means 4 comprising a first locking device such a moveable pin 6, is arranged on the outside of the front of the relay cover 1.
  • the locking means includes a tag or eye 7 arranged with a passageway. When the locking means 4 is moved to a locked position, the eye 7 co-operates with a second eye 8 or other passageway fastened to the locking means 4, through which a lock or a padlock 9 is attached as shown in Figure 3.
  • the locking means 4 comprises an electrical switch.
  • the electrical switch is arranged such that the coil excitation current is disconnected from the coil when the locking means is in the locked position.
  • the armature protrudes through the front of the relay cover, as shown in Figure 4.
  • the protruding part 12 of the armature has a second locking 6
  • a locking means 6a is arranged on the front of the relay cover 1 to co-operate with the recess 11a in the armature, as shown in Figure 4.
  • a further embodiment of the locking means shown in Figure 5 has a first locking device 6b which is moveable through a passageway in the relay cover (not shown) to where it is placed between the magnets 13 and the coil 14. In this way the armature is prevented from moving from the open to the closed position.
  • the first locking device 6b is sized in relation to the distance between the magnets 13 and the coil 14 so that no significant movement of the armature is possible when the locking device 6b is inserted.
  • the first locking device is also made from a non-conductive material and/or suitably insulated and enclosed.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Breakers (AREA)

Abstract

An industrial relay comprising a relay cover (1) and an armature moveable between an open position and a closed position which further comprises a locking means (4). The locking means (4) is arranged on the front of the relay cover for co-operation with the armature of the relay in the open contacts position such that the armature is lockable in the open contacts position.

Description

Relay
TECHNICAL FIELD
The invention concerns the technical field of low voltage switchgear and control gear for industrial use. In particular it concerns mechanical contactors, sometimes described and in the following called relays, used for switching on and off electrical equipment such as electric motors.
BACKGROUND ART
It is common practice to use relays to switch industrial electrical equipment on and off. One such series of relays is illustrated in a brochure from ABB Control called CONTACTORS. A range of relays is illustrated including models for use with electric motors ranging in power from 2.2 kW at 220V AC up to 315V at 1000V AC.
The safe operation of electrical equipment requires that the equipment can be made mechanically safe and electrically safe.
A requirement that arises with electrical equipment is that it may be secured in the off position. This is required for example for maintenance access to equipment. In many instances it can be damaging to equipment or dangerous for operators if the equipment were to be switched on before the maintenance were complete. Isolators which isolate the equipment from an electrical supply or circuit breakers are frequently used for this purpose. A circuit breaker may for example be set in the open position and a lever on the outside of the case locked in the open position with a padlock. However there is often only 2
one circuit breaker in each power circuit but more than one - separately operated piece of electrical equipment connected to that circuit. Thus a requirement exists to isolate one item of independently switched equipment safely without isolating other equipment connected to a power circuit.
This area is covered in an international standard IEC 947-1 (1996-09) and Amendment 1, 60947-1, (1997-12) which is entitled Low voltage switchgear and control gear. In this standard, the additional constructional requirements for equipment for isolation are specified under sections 7.1.6. in the standard and the amendment. The requirements include that "Indication of the position of the main contacts shall be provided" and that "When means are provided or specified by the manufacturer to lock the equipment in the open position, locking in that position shall only be possible when the main contacts are in the open position" .
US 3745492 describes an electromagnetic contactor. A mechanical latch mechanism 16 is also described, fitted to a sideways-extending part of the baseboard on one side of the contactor. This latch may be locked in a locking position with a padlock. The latch includes seven metal parts, one slide member 168, two of coil springs 186, two of retaining pins 188, and two upright supports 170, 172 assembled together, fastened together by, for example, spot-welding, which latch assembly is then screwed or riveted to the baseboard. Latch mechanism 16 does not include a means for electrical disconnection of the coil excitation current.
SUMMARY OF THE INVENTION
The object of the invention is to provide an improved mechanical contactor or relay that also functions as an 3
electrical isolator in a way that satisfies recognised standards .
This and other objects are satisfied according to the invention by arranging a locking means on the front of the relay cover for co-operation with the armature in the open contacts position such that the armature is lockable in the open position. When the contacts are in the open position, the locking means is moveable into a locked position. In the locked position, the locking means mechanically locks the armature inside the relay in the open position (off position) so that the relay cannot be moved to the closed position (on position) . The locking means is secured in the locked position with a lock. The locking means can only be moved into the locked position when the main contacts are in the open position.
In a development of the invention the locking means includes a electrical switch that disconnects the coil excitation current when the locking means is in the locked position. A further embodiment of the locking means prevents the relay from being moved to the closed position by co-operating with the magnets.
The advantages of the invention include that it may be used as a substitute for a separate isolating device in some applications. The invention thus economically serves as both a relay and an isolator in some applications. The relay is very compact and requires a minimum of space for mounting it. When a relay is locked according to the invention that condition is visibly and unambiguously indicated on the front of the relay cover. Even when a row of similar relays are mounted side by side, it is obvious which relay is locked by a padlock cooperating with a locking means according to the present invention. The invention is also economic to manufacture and simple to use and contributes to the safe use of equipment. 4
A SHORT DESCRIPTION OF THE DRAWINGS
Figure 1 shows schematically an external view of a relay with a locking means according to the invention.
Figure 2 shows a view of parts of a relay with locking means according to the invention.
Figure 3 shows a external view of a relay with a locking means according to the invention.
Figure 4 shows an external view of a relay with another embodiment of the locking means according to the invention.
Figure 5 shows a view of parts of a relay with a another embodiment of the locking means according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A relay of the contactor type according to common practice consists of moveable contacts arranged on an armature, fixed contacts, a coil and magnets. The armature moves from an open position to a closed position. Such a relay is normally arranged with one resting position only, which is in the open position. Relays are usually mounted on a backplate 2, normally enclosed in a cover 1 with only the end of the armature and the connection pieces 3 visible from the outside, as shown in Figures 1, 4.
The invention comprises a locking means 4 with a first locking device, for example a sliding pin or a moving rod 6 which is arranged on the outside of the front of the relay cover 1 in a plane substantially parallel with backplate 2. A second locking device such as a recess or passageway 11 is arranged on the armature 10 as shown in Figure 2. The first locking 5
device is arranged in the locking means 4 on the front of relay cover 1 such that it can co-operate with the recess in the armature and lock the armature when it is in the open position. The locking means 4 is arranged with tags 7, 8 comprising passageways such that a lock or a padlock 9 is used to secure the relay in the locked position. When the armature is locked in the open position the contacts cannot be switched from the open to the closed position. Thus, only persons having a key to the lock are able to unlock the relay and switch on the machine.
The armature 10 shown in Figure 2 is arranged with second locking device such as a recess 11 positioned adjacent to an passageway 5 in the relay cover 1. A locking means 4 comprising a first locking device such a moveable pin 6, is arranged on the outside of the front of the relay cover 1. The locking means includes a tag or eye 7 arranged with a passageway. When the locking means 4 is moved to a locked position, the eye 7 co-operates with a second eye 8 or other passageway fastened to the locking means 4, through which a lock or a padlock 9 is attached as shown in Figure 3.
When the relay is locked with the locking means 4, the position of the armature is indicated by the locked position of the locking means on the front of the relay cover 1.
In an advantageous development of the invention the locking means 4 comprises an electrical switch. The electrical switch is arranged such that the coil excitation current is disconnected from the coil when the locking means is in the locked position.
In another embodiment of the invention the armature protrudes through the front of the relay cover, as shown in Figure 4. The protruding part 12 of the armature has a second locking 6
device such as a passageway or recess 11a. A locking means 6a is arranged on the front of the relay cover 1 to co-operate with the recess 11a in the armature, as shown in Figure 4.
A further embodiment of the locking means shown in Figure 5 has a first locking device 6b which is moveable through a passageway in the relay cover (not shown) to where it is placed between the magnets 13 and the coil 14. In this way the armature is prevented from moving from the open to the closed position. In this embodiment the first locking device 6b is sized in relation to the distance between the magnets 13 and the coil 14 so that no significant movement of the armature is possible when the locking device 6b is inserted. The first locking device is also made from a non-conductive material and/or suitably insulated and enclosed.

Claims

7Claims
1. An industrial relay comprising a relay cover (1), a locking means (4) and an armature moveable between an open position and a closed position, characterised in that the locking means (4) is arranged on the front of the relay cover (1) for cooperation with the armature of the relay in the open contacts position such that the armature is lockable in the open contacts position.
2. An industrial relay according to claim 1, characterised in that said locking means (4) comprises a first locking device (6, 6a, 6b) and a second locking device (11, 11a) .
3. An industrial relay according to claim 1, characterised in that said first locking device (6, 6a, 6b) is attached moveable to said locking means (4) .
4. An industrial relay according to claim 2 , characterised in that said second locking device is provided with a recess (11,
11a) in the armature for receiving said first locking device (6, 6a, 6b) through a passageway in the relay cover (1) .
5. An industrial relay according to claim 1, characterised in that said locking means comprises a switch that disconnects the excitation current from the coil when said locking means (4) is in the locked position.
6. An industrial relay according to any of the claims 1 to 5 , characterised in that said locking means comprises one or more passageways (7, 8) for receiving a padlock (9) when the locking means is in the locked position so preventing the relay from being switched on without the use of a key. 8
7. An industrial relay according to claim 1, characterised in that said locking means can only be operated and locked in the open contacts position.
8. A method for indicating the position of the main contacts of an industrial relay comprising an armature, fixed contacts and moveable contacts, characterised by the steps of
- providing the relay with a locking means (4) on the outside of the front of relay cover (1) , - locking the armature with the contacts in the open position using said locking means (4),
- securing said locking means (4) in the locked position with a lock or padlock (9) attached via one or more passageways (7, 8) in said locking means (4) showing that said armature is in the open position.
9. A method for isolating an electrical apparatus connected to an electrical supply by an industrial relay comprising an armature, fixed contacts and moveable contacts, characterised by the steps of
- providing the relay with a locking means (4) on the outside of the front of relay cover (1),
- locking the armature with the contacts in the open position using said locking means (4) , - securing said locking means (4) in the locked position with a lock or padlock (9) attached via one or more passageways (7, 8) in said locking means (4).
EP99947052A 1998-04-29 1999-04-29 Relay Expired - Lifetime EP1075702B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9801499A SE519799C2 (en) 1998-04-29 1998-04-29 Industrial relay and method
SE9801499 1998-04-29
PCT/SE1999/000712 WO1999056295A1 (en) 1998-04-29 1999-04-29 Relay

Publications (2)

Publication Number Publication Date
EP1075702A1 true EP1075702A1 (en) 2001-02-14
EP1075702B1 EP1075702B1 (en) 2005-08-17

Family

ID=20411127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99947052A Expired - Lifetime EP1075702B1 (en) 1998-04-29 1999-04-29 Relay

Country Status (5)

Country Link
EP (1) EP1075702B1 (en)
AU (1) AU4302999A (en)
DE (1) DE69926744T2 (en)
SE (1) SE519799C2 (en)
WO (1) WO1999056295A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1547112B1 (en) 2002-10-02 2007-06-20 Siemens Aktiengesellschaft Electromagnetic switching device
DE10246092B4 (en) * 2002-10-02 2004-11-11 Siemens Ag Electromagnetic switching device
US7442888B2 (en) * 2005-08-22 2008-10-28 Scientific Technologies Incorporated Safety lock for interlock switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745492A (en) * 1971-11-17 1973-07-10 Westinghouse Electric Corp Electromagnetic contactor with safety latch device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9956295A1 *

Also Published As

Publication number Publication date
SE9801499L (en) 1999-10-30
AU4302999A (en) 1999-11-16
WO1999056295A1 (en) 1999-11-04
DE69926744T2 (en) 2006-06-14
DE69926744D1 (en) 2005-09-22
SE519799C2 (en) 2003-04-08
SE9801499D0 (en) 1998-04-29
EP1075702B1 (en) 2005-08-17

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