MVAX 11 Brochure0 pages

MVAXll

PROTECTION

Tripping and interposing supervision relay

The MVAX11 relay supervises the trip circuit of tripping relays such as the MVAJ or interposing

control relay type MVAW. The relay is an attracted armature unit of simple and robust

construction having a positive action without chatter. It has two dropping resistors Rl and R2

of equal ohmic value, connected in series with the coil. Under healthy conditions the relay coil is

energised via the dropping resistor R2 as shown in figure 1 (interposing relay circuit) and in

figure 2 (tripping relay circuit).

If the circuit being supervised becomes open circuited or if the supply fails, the relay will become

deenergised and an alarm or visual indication will be given. To prevent the alarm being given

when the circuit being supervised is operated, the relay coil is maintained via the dropping

resistor Rl. For this purpose, an additional normally open contact is required from either the

push button in figure 1 or tripping relay contact in the case of figure 2.

Type MVAW 02 relay withdrawn from case

Ordering options

IWMI1N1

Set Beast Rama Hag

KT'i fl**' ^<-fi^i i ' tag

cm □

cA Z :- ltd]

4 a MiTM U

3X3* vac

Vac

lift'125 Vet

m ■ < ft

as

wo

OK

-'):

4 Maw

2MOM -2BW*

7]

Compact i

No false alarms due to protection

operation

Continuous monitoring of trip circuit

GRID