The MVAJ 11 to 34 range complements the more cost-effective range of MVAJ 051 to

MVAJ 205 tripping relays catering for the preferences of historical users.

MVAJ general characteristics can be found in table 1 that includes information on how

relay burden is modified at, or just after operation. ‘Economy’ indicates that the burden

reduced to a low value.

Instantaneous cut-off is a feature of some hand and electrical-reset elements and

the burden to zero, whilst others incorporate a time delay to enable series elements

operate. This time delay is 40 ms to 60 ms in all cases, except that of  type MVAJ 26

the delay is 2 s. All low burden relays are suitable for AC or DC operation. All high

relays are for DC operation only.

Types MVAJ 23. 25 High Burden Tripping Relays

with Instantaneous Cut-off

These relays incorporate a break contact in series with the

operate coil. Located on the main contact stack, it is arranged to

break the coil circuit once the relay mechanism has completely

operated. This reduces the relay burden to zero as soon as

mechanical latching of the contacts has occurred.