Designed specifically to address the problem of achieving portability without sacrificing functionality or performance, Megger’s latest MS-2A primary injection test sets weigh just 15 kg, yet they incorporate a variable high-current source that is capable of delivering up to 240 A at 3 V continuously for up to 30 minutes.
Ideally suited for testing the time-delay characteristics of over-current relays, motor overload relays and moulded-case circuit breakers rated at up to 125 A, the MS-2A test sets also have a generous over-current capability. This further extends their usefulness by allowing them to be used, for example, to verify the instantaneous trip function of moulded case circuit breakers at up to 750 A. Earth fault protection devices with window CTs can also be tested easily and conveniently.
The versatility of these test sets is further enhanced by the incorporation of a digital memory ammeter that has a read-and-hold function for capturing short-duration currents, and a digital multi-range timer with autoranging, which measures the operating time of the device under test with a resolution of one millisecond.
To ensure maximum reliability and to eliminate the need for contact maintenance, MS-2A test sets use a triac rather than a contactor to initiate the current output. The initiating circuit provides momentary and sustained modes to control output duration, allowing a very wide range of tests to be performed.
In addition to their use for testing low-voltage circuit breakers and over-current relays, MS-2A high-current primary injection test sets are also an ideal choice for carrying out earth-fault performance tests, verifying the ratio of current transformers, and checking the function of panel-mounted ammeters.
Housed in a high-strength suitcase-style enclosure with a carrying handle and removable lid, MS-2A test sets incorporate safety terminals and are supplied complete with standard 200 cm test leads. They comply fully with relevant international and European standards, and they carry the CE marking.
Megger
www.megger.com
