MVAJ 05-10-20 tripping and control relays0 pages

PROTECTION PRODUCT SOLUTIONS

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 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.

KEY FEATURES

• Negligible contact bounce

• 10 contacts in Midos size 2 case

• 20 contacts in Midos size A case

• Supplied as high burden

• Low burden easily selectable by

removing an external link

• Hand, electrical and self reset

variations

• Reset inhibition feature

• Delayed cut-off available in high

burden applications

• AC or DC operation for low burden

configuration

• 2.5 second time delay

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.

CUSTOMER BENEFITS

• Directly operates circuit

breaker trip coils

• High reliability

• High-speed operation

• Immunity to wiring

capacitance discharge

Grid-SAS-L3-MVAJ_05_10_20-2513-2013_09-EN. Information contained in this document is indicative only. No representation or warranty is given or should

be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided

without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

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