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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ALSTO'M
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