1

GRID

PROTECTION

Type VAJ relays are fast operating multi-contact attracted armature relays with a high degree of mechanical stability and are suitable for control duties where a number of simultaneous switching operations are required.

Control relays generally have lower burdens than tripping relays and are used for applications such as starting and shutting down apparatus in automatic stations.

The mechanical construction ranges from a basic attracted armature unit to more complex arrangements employing several mechanically linked contact stacks and heavy duty armature assembly.

Cut-off contacts are provided on electrically reset relays. The contacts are time delayed on opening, and after a short time delay cut off the operating current.

Standard voltage ratings

Operating and reset coils : 24, 30, 48, 110, 125, 220, 230, 240 and 250 volts d.c.

Satisfactory operation and reset is between 80% and 120% of rated voltage.

Contacts

The number of pairs of contacts available for tripping of contacts available are shown in the table. Any combination of normally open or normally closed contacts can be fitted. Contacts are of silver/copper alloy, shaped and positioned to ensure low resistance and maximum reliability.

Customer Benefits

• Electrical Reset• High Reliabiltiy• High speed operation

CONTROL RELAYVAJC

Cut-off Contacts

The electrically reset relays are fitted with heavy duty cut-off contacts. These contacts interrupt the operating circuit instantaneoulsy when the relay has operated and latched in, to reduce relay burden and possible heating effect.

124153

2

VAJC

Contacts Ratings

Make and carrycontinously

MAKE AND CARRYFOR 0.5 SECOND

Break

AC 1250 VA with maximaof 5A and 660V

7500 VA with maxima of30A and 660V

1250 VA with maximaof 5A and 660V

DC 1200W with maxima of5A and 660V

7500W with maxima of30A and 660V

100W resistive , 50Winductive with maximaof 5A and 660V

Operating time and burdens

RELAYTYPE

NOMINALOPERATING

BURDEN(In Watts )

MAXIMUMBURDEN

OPERATED(In Watts )

NOMINALRESET COIL

BURDEN(In Watts )

MAXIMUMOPERATING TIME(In milliseconds)

VAJC 11 20 0 20 25

RELAY TYPE PAIRS OF CONTACTS CONTACT RESET DUTYVAJC11 8 Electrical Control

Thermal rating

The control relays are arranged so that 120% rated voltage can be applied continuously. Reset coils, which are normally energised through a push button, are short time rated.

NUMBER OFPAIRS OFCONTACTS

CASE SIZEAND TYPE

MAXIMUM OVERALLDIMENSIONS (mm)

MAXIMUMNUMBER OFTERMINALSHeight

mmWidthmm

Depth*mm

8 1/2 N 152 20

8 1D 237 179 218 20

Figure 1 : Case and panel cut-out dimensions for case 1/2 N Ver. (all dimensions in mm)

3

Dimension Details

VAJC

Cases are suitable for flush or projecting mounting. All cases are finished phenolic black as standard. Standard relays are finished to B.S.2011: 20/40/4 and are satisfactory for normal tropical use. Relays for use in exceptionally severe environments can be finished to B.S.2011:20/50/56 at extra cost.

Figure 2 : Case and panel cut-out dimensions for case 1D (all dimensions in mm)

4

GRID

Relay Type: VAJC

Contacts:

8 Pair Contacts 11

Case:

1/2N V Non-Drawout Case ZF

1D V Drawout Case with CT shorting links BF

Auxiliary Voltage:

24/27 Vdc 000

30/34 Vdc 025

48/54 Vdc 050

110/125 Vdc 075

220/250 Vdc 100

Contact Combination:

8 N/O 0

7 N/O 1N/C 1

6 N/O 2 N/C 2

5 N/O 3 N/C 3

4 N/O 4 N/C 4

Burden

Low Burden A

Flag Option:

With flag B

Issue:

Factory Defined A

Information required with your order.

VAJC

ALSTOM T&D INDIA LIMITEDPallavaram Works19/1, G.S.T. Road,Pallavaram, Chennai - 600 043Tel: 91-44-2264 8000Fax: 91-44-2264 0040

ALSTOM T&D Worldwide Contact Centre:http://www.alstom.com/contactcentre/Tel.: +44 (0) 1785 250 070

www.grid.alstom.com

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