GE MVAJ23R1AB0505F MIDOS HIGH BURDEN TRIP RELAY

MVAJ 05/10/20 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

coil rating and the number of circuits to be energised.

The MVAJ relay interfaces with the protection to provide: higher contact

additional contacts for tripping multiple circuit-breakers, control functions, signalling

interlocking.

The MVAJ range comprises very reliable hinged armature relays designed to

operate circuit-breaker trip coils. Built to very high specifications, the MVAJ range

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

High Burden Application

These relays, supplied as high burden, are suitable for use in high

security circuit-breaker tripping circuits. The high burden provides

greater immunity to capacitance discharge currents, which can

result at the inception of an earth fault on battery wiring. This

makes the relays particularly suitable for use in distributed

tripping or control relay contact logic schemes, where the

initiating contact may be remote from the relay.

Low Burden Application

These relays are suitable for general applications where the

initiating contact is located close to the relay. When configured

for low burden applications, by removing the external link from

terminals 22 and 24. the burden is either cut off during operation

or is economised to a low figure instantaneously.

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