MVAJ13D1GB0780A  Tripping and Control Relays

Description

MVAJ13D1GB0780A  Tripping and Control Relays

Tripping and Control Relays
Protective relays are precise measuring devices, the contacts of which should not be
expected to switch large electrical loads.
In some cases, the protective relay can trip a circuit- breaker directly, or according to the
coil rating and the number of circuits to be energised.
The MVAJ relay interfaces with the protection to provide: higher contact capacity,
additional contacts for tripping multiple circuit-breakers, control functions, signalling and
interlocking.
The MVAJ range comprises very reliable hinged armature relays designed to directly
operate circuit-breaker trip coils. Built to very high specifications, the MVAJ range provides
a highly flexible and reliable link between the protective relays and the circuit-breakers.
Models Available

Trip relays
Trip relays possess a standard hand-reset flag and operate within 10 ms.
Table 1 shows the trip relay versions available

Control relays
Control relay variants of each trip relay are available. These relays operate within
approximately 15 ms

All relays configured for high burden applications are suitable for DC operation only

MVAJ13D1GB0780A

Self-reset relays reset when the initiating signal is removed,
making them suitable for use as trip relays in auto-reclose
schemes and also for general flagging purposes. Hand-reset relays
require manual resetting, making them effective lockout relays
which are commonly used to trip circuit-breakers associated with
transformers. Electrical-reset relays require a voltage to be
applied to the unit to reset the contacts. These relays may be
used in auto-reclose schemes, or where remote resetting of the
relay is required.
Trip Relay
With the exception of the MVAJ 102 time delayed self-reset
relays, all trip relays are suitable for either low burden or high
burden applications.

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