Digital memory ammeter:
High-accuracy, direct reading instrument has read-and-hold memory
for measurement of
short-duration currents.
Digital, multi-range 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.
Solid-state output initiate circuit:
Solid-state circuit
eliminates need for contact maintenance.
Portable, high-current test set:
Unit weighs only 33 lb
(15 kg) and is tough enough to withstand daily field or plant
use.
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 panel-board ammeters
and
voltmeters.
