r6010e_mvax (2).pdf

iFeatures

l Low burdenl Trip circuit can be supervised with

breaker open or closedl Mis-tripping of breaker by

accidental short-circuits avoidedl No false alarms given due to

protection operation

Application

The Type MVAX relay supervises thetrip circuit of a circuit breaker,initiating audible alarm and visualindication if the trip circuit fails or themechanism does not operate. Four types are available givingsupervision as follows:Relay type Faults detectedMVAX 12 Failure of trip

Midos2

supply onlyMVAX 21, MVAX 31 andMVAX 91 Failure of trip

supplyOpen circuit trip coil or trip circuit wiringFailure of circuit breaker tripping mechanism

Type MVAX 31 gives supervision withthe circuit breaker in either state, andtype MVAX 21 with circuit breakerclosed only.If required, the alarm units of typesMVAX 21 and MVAX 31 can beoperated via pilot wires.Type MVAX 91, three seperate MVAX 31s in a size 8 case.Type MVAX 12, 21Trip Circuit SupervDescription

The relays are basically attractedarmature units of simple and robustconstruction having a positive actionwithout chatter.Type MVAX12 is a single unit whichis simply connected across the tripcircuit supply as shown in Figure 2(a).The unit is normally energised anddrops off if the trip voltage is lost orfalls below approximately 40% ofnominal. The unit picks up below 80%of rated voltage.

Figure 1: Type MVAX relay withdrawn from ca, 31, 91sion RelaysTo avoid operation due to voltagedips caused by faults in other circuitsa resistance-capacitance time delaycircuit is incorporated to give 100msdelayed drop off.Type MVAX 21 consists of two unitsconnected as shown in Figure 2(b).Under healthy conditions with thecircuit breaker closed, both units areenergised. If the trip circuit becomesopen or the supply fails, unit RL2drops off and opens contact RL21 tode-energise unit RL1. When the circuitbreaker is open, the auxiliary switchshunts contact RL21 to hold in unit RL1.

se

C 1 R2

RL12

Viewed from frontCase earth

1 2

3 4

5 6

13 14

21 22

27 28

Module terminalblock viewed from rear

R ext R113

2 134

_

14

(a) CT shorting links make before (b) & (c) disconnect

(b) Short terminals break before (c)

(c) Long terminals

Note 1

Vx+

RL13

+

+

52T

RL2

Alarm supply (Vx (1))

21 28 Rext (1)

27 RL2-1

52-b

CB Auxswitch

CB Auxswitch

Trip supply (Vx (2))Trip coil

Trip relay

Rext (2) 13 14 RL1-1

RL1-2Alarm

contactsNote: Contact arrangement shown is typical only. RL1-35

2

1 3

4

7

52-a

_

_

The units are delayed (by means ofcopper slugs) on drop off for a total of400ms, to prevent a false alarm dueto voltage dips caused by faults inother circuits or during a normaltripping operation, when unit RL2 ismomentarily short circuited by the selfreset trip relay contact. If the trip relayfails to reset due possibly to failure ofthe circuit breaker trippingmechanism, the alarm is initiated.Type MVAX 31 consists of three unitsconnected as shown in Figure 2(c).Under healthy conditions with thecircuit breaker closed, units RL2 andRL1 are energised and the operationis the same as type MVAX 21.When the circuit breaker is open, unitRL3 is also energised via the normallyclosed auxiliary switch and unit RL1 isheld in by contact RL31. Unit RL3 willdetect trip circuit abnormalities withthe circuit breaker open, in a similarmanner to unit RL2 with the circuitbreaker closed.The units are delayed a total of400ms on drop off, as in type

Figure 2(a): MVAX 12 Trip supply supervision

Figure 2(b): MVAX 21 Trip circuit supervision

RL2

Trip relay

Rext (2) 13 14

+

Rext (3) 21 22

52-a52T

+ _

_

RL1-1

RL1-2Alarm

contacts

Note: Contact arrangement shown is typical only. RL1-35

2

1 3

4

7

Alarm supply (Vx (1))

27 RL3-1

RL2-1

28 Rext (1)RL13

RL3

CB Auxswitches

52-b

Trip supply (Vx (2))

Figure 2(c): MVAX 31 Trip circuit supervisionMVAX 21.Type MVAX 91 consists of threeseperate MVAX 31s connected asshown in Figure 2(d).3

4RL2

Trip relay

Rext (2) 47 48

+

Rext (3) 45 46

52-a52T

+ _

_RL1-1

RL1-2Alarm

contacts

Note: Contact arrangements shown are typical only.For 30 110/125V only

RL1-333

30

29 31

32

35Alarm supply (Vx (1))

49 RL3-1

RL2-1

50 Rext (1)RL13

RL3

CB Auxswitches

52-b


Phase A

RL2

Trip relay

Rext (2) 53 54

+

Rext (3) 51 52

52-a52T

+ _

_RL1-1

RL1-2Alarm

contacts

RL1-341

38

37 39

40


55 RL3-1

RL2-1

56 Rext (1)RL13

RL3

CB Auxswitches

52-b


Phase B

RL2

Trip relay

Rext (2) 25 26

+

Rext (3) 23 24

52-a52T

+ _

_RL1-1

RL1-2Alarm

contacts

RL1-35

2

1 3

4


27 RL3-1

RL2-1

28 Rext (1)RL13

RL3

CB Auxswitches

52-b


Phase C

Figure 2(d): MVAX 91 Trip circuit supervision

5Case earth

1 2

3 4

5 6

7 8

9 10

11 1213 14

21 22

Module terminal block viewed from rear

(a) CT shorting links make before (b) & (c) disconnect (b) Short terminals break before (c) (c) Long terminals

Note 1

27 28

Rear mounted facing rearviewed from front

A

RL3

V

Vx +

ZGO891


A

RL2

V

Vx +

ZGO891

Front mounted facing frontviewed from front

2

RL1

V

Vx +

ZGO891

5

3

74

31

22 14 28

RL2-A

RL3-A

2713 R2R121

Combinations of Output contacts tooutput contacts module terminals

1 3 5 7 2 4

3M M M M

2M 1B B M M

1M 2B B M B

Figure 2(e): MVAX 31 Trip circuit supervision relay with preclosing supervision (ac)

6Case earth1 2

3 4

5 6

7 89 1011 12

13 14

21 22

Module terminal blockposition A viewed from rear

Module terminal blockposition D viewed from rear

15 16

17 18

19 20

23 24

25 26

Note 1

Note 2For 30 110V/125V only

27 28


A

RL3

V

Vx +

ZGO891


A

RL2

V

Vx +

ZGO891


30

RL1

V

Vx +

ZGO891

33

3

3532

3129

46 48 50

RL2-A

RL3-A

49 47 R2R145

Case earth29 30

31 32

33 34

35 36

37 38

39 4041 42

49 50

43 4445 46

47 48

51 52

53 54

55 56

Phase A


A

RL3

V

Vx +

ZGO891


A

RL2

V

Vx +

ZGO891


38

RL1

V

Vx +

ZGO891

41

3

4340

3937

52 54 56

RL2-A

RL3-A

55 53 R2R151

Phase B


A

RL3

V

Vx +

ZGO891


A

RL2

V

Vx +

ZGO891


2

RL1

V

Vx +

ZGO891

5

3

74

31

24 26 28

RL2-A

RL3-A

2725 R2R123

Phase C

Combination ofoutput contacts

Phase output contactsto module terminal

A Phase3M2M1M3B B Phase3M2M1M3BC Phase3M2M1M3B

29-31MBBB

37-39MBBB

1-3MBBB

33-35MMM

N/A41-43

MMM

N/A5-7MMM

N/A

30-32MMBB

38-40MMBB

2-4MMBB

34-36N/AN/AN/A

B42-44N/AN/AN/A

B6-8

N/AN/AN/A

B

-1B2B-

-1B2B-

-1B2B-

CT shorting links makebefore (b) & (c) disconnect

Short terminals break before (c)

Long terminals

(a)

(b)(c)

Figure 2(f): MVAX 91 Trip circuit supervision relay with preclosing supervision (ac)

Technical Data

Note: For ac supervision relays, the technical information is the same as for dc versions

Voltage ratings (Vx) Relays are available for use on any combination of the following standard auxiliary supplies for trip and alarm.Rating Operative range(V dc) (V dc)24/27 193030/34 2437.548/54 37.560110/125 87.5137.5220/250 175275All relays will withstand the maximum voltage in the operative range continuously.

Note: MVAX 91 not available in 220/250V range.

Burden

MVAX 12 MVAX 21, 31 and 91 (see note)Rating (V dc) Trip Alarm

mA W mA W mA W24/27 45 1.23 55 1.5 80 2.530/34 36 1.22 35 1.5 80 348/54 23 1.25 20 1 80 4110/125 15 1.9 20 2.5 63 8220/250 9 2.3 20 4.5 60 15Notes:1. All the burdens are at the maximum rated value2. All burdens are less than the figures quoted3. With the circuit breaker open the trip supply burden of the MVAX 21 is zero4. MVAX 91 = 3 x MVAX 31mA/W, 3 seperate units

Maximum pilot loop resistance of alarm supply Rating Maximum pilot

(V dc) loop resistancein ohms

24/27 10030/34 20048/54 400110/125 400220/250 400The operating range of the alarm supply output relay (RL1) is unimpaired with the above pilot resistances,

Operating/resetting times

1.Typical operating times MVAX 12 < 20msMVAX 21, 31, 91 < 70ms

2.Typical resetting times MVAX 12 >100 msMVAX 21, 31, 91 > 400 msNote: Times measured at the lower rated voltage. 91 (3 x MVAX 31)7

8Operation indicator A hand or self reset mechanical operation indicator can be supplied.

Contacts

MVAX 12 2 pairs of electrically separate contacts in any combination of normally open or closedMVAX 21, 31, 91 (3 x MVAX 31) 3 pairs of electrically separate contacts in any combination of normally open or closed

Contact ratings

Current Make and Carry Make and Carry BreakContinuously for 3s

ac 1250VA with 7500VA with 1250VA with maxima of maxima of maxima of 5A and 660V 30A and 660V 5A and 660V

dc 1250W with 7500VA with 100W (resistive)maxima of maxima of 50W (inductive 5A and 660V 30A and 660V with maxima of

5A and 660V

Voltage withstand

InsulationIEC 2555 2kV rms for 1 minute between all case

terminals connected together and the case earth terminal2kV rms for 1 minute between independent circuits including contact circuits. 1kV rms for 1 minute across normally open outgoing contact pairs

High voltage impulseIEC 2555 5kV peak, 1.2/50s, 0.5J between

all terminals and case earth and between adjacent terminals

Environmental withstand

TemperatureIEC 6821/IEC 6822 Storage and transit 25C to +70

Operating 25C to +55CHumidityIEC 6823 56 days (at 93% RH and +40C)Enclosure protectionIEC 529 IP 50 (dust protected)VibrationIEC 255211 0.5g between 10Hz and 150HzMechanical durability

Loaded contact 10,000 operations minimumUnloaded contact 100,000 operations minimum

4 holes 4.445

1324

Cases

Type MVAX 12 is available in a size2 case, see Figure 3. Types MVAX 21and MVAX 31 are available in size 3cases see Figure 4. Type MVAX 91 isavailable in a size 8 case, see Figure 5.

Information Required withOrder

Relay typeAlarm and trip supply voltagesContact combinationOperation indicator required

Fi

FiPush buttonprojection 10 max

All dimensions in mm

Panel cut-out:Flush mounting fixing details

Flush mounting51

21232 25 min.

Reset

157 max.

48

159168

177

Push buttonprojection 10 max



4 holes 4.4

Flush mounting

71

77

21232 25 min.

Reset

157 max.

73

159168

2623.5

177

gure 3: Case outline size 2

gure 4: Case outline size 39

10

Push buttonprojection 10 max



4 holes 4.4

Flush mounting

200

206

21232 25 min.

11

Reset

157 max.

203

159168

155.424

177

Figure 5: Case outline size 8

FeaturesApplicationDescriptionTechnical DataVoltage ratings (Vx)BurdenMaximum pilot loop resistance of alarm supplyOperating/resetting timesOperation indicatorContactsContact ratingsVoltage withstandEnvironmental withstandMechanical durability

CasesInformation Required with Order

r6010e_mvax (2).pdf

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