T & DEnergy Automation & Information

Type MVAA

Auxiliary Relays

2

Features• Compact design• Mechanically stable• Hand, self and electrically reset

versions available• Wide voltage range• Optional operation indicator

Models AvailableThere are five versions of the MVAArelay, each with a different type ofcontact reset mechanism.

• MVAA 11

Single element relay with self resetcontacts.Two element version is type MVAA21

• MVAA 12

Single element relay with acombination of self and hand resetcontacts.Two element version is type MVAA22

• MVAA13

Single element relay with hand resetcontacts.Two element version is type MVAA23

• MVAA 14

Single element relay with electricalreset contacts

• MVAA 15

Single element relay with hand andelectrical reset contacts. Thecontacts can be reset eitherelectrically or by hand

DescriptionMVAA relays are voltage operatedattracted armature units of compactdesign with a positive action and ahigh degree of mechanical stability.Voltage is applied to the relay coilsvia an internal diode bridge whichenables relays to be energised fromac or dc power supplied. All relayscomply with IEC 255.

Figures 2 and 3 show typicaldiagrams of relay types MVAA 11and MVAA 14 respectively.

Type MVAAAuxiliary Relays

Figure 1: Type MVAA relay withdrawn from case

ApplicationThe type MVAA is a low burdenauxiliary relay which can be usedwhere a scheme demands severalcontacts for event recording, alarminitiation, contact logicarrangements, etc

The relay can be supplied fittedwith normal duty contacts and/orwith heavy duty blow-out contacts.

3

Case earth

1 23 45 67 89 1011 1213 14

21 22

27 28

(OP)

14

ZG0891

R113Vx

246810

13579

Viewed from front

RL1

Note 1(a) CT shorting links make

before (b) & (c) disconnect(b) Short terminals break before (c)

Long terminals(c)

Module terminal blockviewed from rear

1 23 4

5 67 89 1011 1213 14

21 22

27 28

RL1 (Reset)

28

ZG0891

R227Vx

(OP)

14

ZG0891

R113Vx

246810

13579

RL1Case earth

Module terminal blockviewed from rear

Note 1(a) CT shorting links make

before (b) & (c) disconnect(b) Short terminals break before (c)

Long terminals

Viewed from front

(c)

Figure 3: Circuit diagram: MVAA 14 (electrical reset contacts) ac or dc

ContactsContacts are constructed fromsilver/copper alloy, shaped andpositioned to ensure very reliable,low resistance operation.

Normal duty make, break andchangeover contacts and heavyduty magnetic blow-out contacts areavailable in various combinations.See Tables 1, 2 and 3.

Heavy duty magnetic blow-outcontacts are recommended forbreaking heavy or highly inductivedc loads. When these are fitted, thenumber of contacts available maybe reduced. See Table 3.

Breaking capacity curves for thesecontacts are shown in Figure 4.

Operation IndicatorsEach relay element is supplied withan optional hand reset operationindicator. The indicator consists of amask which on operation drops toexpose a broad red strip positioneddiagonally on a rectangular whitebackground.

Figure 2: Circuit diagram: MVAA 11 (self reset contacts) ac or dc

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Technical Data

Ratings• Standard coil ratings

24/27V, 30/34V, 48/54V,

110/125V, 220/250V, ac or dc

• Operative ranges

Voltage rating Operative voltagerange

24/27V 19.2 - 32.4V

30/34V 24.0 - 40.8V

48/54V 38.4 - 64.8V

110/125V 88.0 - 150.0V

220/250V 176.0 - 300.0V

• Frequency

50/60Hz

• Withstand rating

The relay will withstand 120% of itsmaximum voltage ratingcontinuously.

• Burdens

3W per element at all ratedvoltages.

• Operating times

The operating times are typically12-25ms depending on the numberof contacts and relay type.

Contact combinationsRelay Contact combination code Case sizetype letter (cross reference

to detailed contactcombinations in Table 3)

MVAA11 Q 2R 4

MVAA12 S 2MVAA13* Q 2

R 4MVAA14* Q 2

R 4MVAA15* Q 2

R 4Table 1: Available contact combinations and case size for single element relaysRelay Contact combination code Case sizetype letter (cross reference to

detailed contactcombinations in Table 3)Element 1 Element 2

MVAA21 P P 2Q Q 4

MVAA22 S S 4

MVAA23* Q Q 4

Table 2: Available contact combinations and case size for dual element relays

100

10

1.0

0.110 100 1000

5000w2500w

1000w

250w

500w

100w

50w

25w

RESISTIVE

L/R=0.04s

Conta

ct ru

ptur

ing ca

pacit

y in

ampe

res d

c

Applied voltage in volts dc

Figure 5: Curves of breaking capacity of heavyduty blow-out contacts

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*Note: When these relays are required to cut-off their own supply voltagefollowing operation, a special late acting contact must be used. This contactcan be fitted on request and will be wired internally. The number ofavailable output contacts shown in Table 3 reduces by one when a cut-offcontact is supplied.

Contact combinationsContact Normal duty Normal duty Heavy duty combination in any combination changeover in any combinationcode letter of make (M) of make (Z)

or break (B) or break (Y)

P 4 - -

Q 6 - -3 - 21 - 3- 4 -

R 8 - -4 - 42 - 6- 6 -

S 6(2-HR and 4-SR, - -or 2-SR and 4-HR)

where SR = self resetHR = hand reset

Table 3: Contact combinations cross reference table

Contact ratingsContact type Current Make and carry Make and carry Break

continuously for 3 seconds

AC 1250VA with 7500VA with 1250VA withmaxima of 5A maxima of 30A maxima of 5Aand 300V and 300V and 300V

Standard make DC 1250W with 7500W with 100W(resistive)or break or maxima of 5A maxima of 30A 50W(inductive)changeover and 300V and 300V with maxima of

5A and 300V

Heavy DC 1250W with 7500W with seeDuty maxima of 5A maxima of 30A curves

and 300V and 300V

• Maximum rate of operation, 600 per hour.

• DurabilityLoaded contact 10,000 operations minimumUnloaded contact 100,000 operations minimum

High voltage withstand• Dielectric withstand

EC 255-5: 1977

2kV rms for 1 minute between all terminals and case earth.

2kV rms for 1 minute betweenterminals of independent circuitsincluding contact circuits, withterminals on each independentcircuit connected together.

1kV rms for 1 minute across open contacts of output relays.

• High voltage impulse

IEC 255-5: 1977

Three positive and three negativeimpulses of 5kV peak,1.2/50µs,0.5J between all terminals of thesame circuit, between independentcurcuits, and between all terminalsconnected together and case earth.

Electrical environment• EMC compliance

89/336/EECCompliance with the EuropeanCommission Directive on EMC isclaimed via the TechnicalConstruction File route.

EN 50081-2: 1994EN 50082-2: 1995Generic Standards were used to establish conformity.

Product safety

72//23/EECCompliance with EuropeanCommission Low Voltage Directive

EN 61010-1:1993/A2:1995EN 60950:1992/A3:1995Compliance is demonstrated byreference to generic safetystandards.

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Atmospheric environment• Temperature

IEC 255-6: 1988Storage and transit -25°C to +70°COperation -25°C to +55°C

IEC 68-2-1: 1990 ColdIEC 68-2-2: 1974 Dry heat

• Humidity

IEC 68-2-3: 196956 days at 93% RH and 40°C

• Enclosure protection

IEC 529: 1989IP50 (dust protected)

Mechanical environment• Vibration

IEC 255-21-1: 1988Response class 2

CasesRelays are supplied in size 2 orsize 4 cases as indicated in theTechnical Data section. See Figures5 and 6 for outline dimensions.

Information Requiredwith OrderType

Coil rating

Type, number and combinationof contacts

Operating time (if applicable)

Operation indicator

Push buttonprojection 10 max

All dimensions in mm

Panel cut-out:Flush mounting fixing details

4 holes 4.4ø

Flush mounting

45

51

21232 25 min.

Reset

157 max.

48

159168

1324

177

97

177

Push buttonprojection 10 max.

32 21225 min.

157 max.

11103

99

52

23.54 holes Ø 4.4

168 159

Panel cut-out:Flush mounting fixing details.

All dimensions in mm.

Flush mounting.

Reset

Figure 6:Case outline size 4

Figure 5:Case outline size 2

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ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM.MiCOM is a registered trademark of ALSTOM. Other names mentioned, registered or not, are the property of their respective companies.

Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, thisbrochure should only be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product

referred to in it. We cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.

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