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Type MVAW 02 relay withdrawn from case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
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No false alarms due to protection
operation
Continuous monitoring of trip circuit
GRID
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