Atec Megger-Multi-Amp-MS-2 - Manual

MS-2
Circuit Breaker and Overload Relay Test Set
■ Digital memory ammeter
■ Digital, multirange timer
■ High-current output
■ Solid-state output initiate circuit
■ Portable, high-current test set
MS-2
Circuit Breaker and Overload Relay Test Set
DESCRIPTION
The MS-2 test set is used around the world by several
thousand utility companies, industrial plants and electrical
service organizations.
Using the latest technology, Model MS-2 is a self-contained
test set that incorporates a variable high-current output and
appropriate control circuitry and instrumentation for testing
thermal, magnetic or solid-state motor overload relays;
molded-case circuit breakers; and ground-fault trip devices.
APPLICATIONS
Model MS-2 is capable of testing the time-delay
characteristics of motor overload relays and molded-case
circuit breakers rated up to 125 amperes, when following
the recommended test procedure of testing the time delay
of these devices at three times their rating.
Higher currents are available for the short durations
required to test an instantaneous trip element. For
example, the test set will provide a maximum short-
duration output of 750 amperes through a typical,
125 ampere, molded-case circuit breaker.
Additional applications include verifying the ratio of
current transformers and testing panelboard ammeters and
voltmeters.
FEATURES AND BENEFITS
■ Digital memory ammeter: High-accuracy, direct-
reading instrument has read-and-hold memory for
measurement of short-duration currents.
■ Digital, multirange timer: Crystal-controlled, high-
accuracy instrument with autoranging measures
operating time to 1 millisecond.
■ High-current output: Provides instantaneous currents
up to 750 amperes through a 125 ampere breaker.
■ Rugged and lightweight: Unit weighs only 33 lb (15
kg) and is tough enough to withstand daily field or plant
use.
■ Solid-state output initiate circuit: Solid-state circuit
eliminates need for contact maintenance.
SPECIFICATIONS
Input
Input Voltage (specify one): 120 V OR 240 V, 50/60 Hz, 1 f
Output
Output Ranges: The output is continuously adjustable in four
ranges to accommodate a variety of test-circuit impedances:
0 to 5 A at 120 V max.
0 to 25 A at 24 V max.
0 to 120 A at 6 V max.
0 to 240 A at 3 V max.
Output Capacity: The output circuit is designed to permit short-
duration overloads and the output ranges will provide several
times their current rating, provided the output voltage is sufficient
to push the desired current through the impedance of the test
circuit.