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Advanced Test Equipment Rentals
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MS-2
Circuit Breaker and Overload Relay Test Set
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
DESCRIPTION
The MS-2 test set is used around the world by several
thousand utility companies, industrial plants and electrical
service organizations.
FEATURES AND BENEFITS
■ Digital memory ammeter: High-accuracy, directreading instrument has read-and-hold memory for
measurement of short-duration currents.
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.
■
Digital, multirange timer: Crystal-controlled, highaccuracy 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.
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 shortduration 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.
SPECIFICATIONS
Input
Input Voltage (specify one): 120 V OR 240 V, 50/60 Hz, 1f
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 shortduration 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.
MS-2
Circuit Breaker and Overload Relay Test Set
The test set is capable of testing the time-delay characteristics of
devices rated up to 125 A using a test current of three times their
rating (375 A). Additionally, to perform an instantaneous trip test,
it will provide 750 A through a typical, 125 A, molded-case circuit
breaker connected with the test leads provided with the test set.
Overload Capability: To increase use of the test set, it is
designed so that the current ratings may be exceeded for short
durations. Because the magnitude of the output current is
determined by the impedance of the load circuit, the voltage
rating must be sufficient to push the desired current through the
device under test and the connecting test leads.
Percent Rated
Maximum
Minimum
Current
Time On
Time Off
100 (1x)
30 min
30 min
200 (2x)
3 min
8 min
300 (3x)
30 s
4 min
400 (4x)
7s
2 min
Output Initiate Circuit: The test set uses a solid-state output
initiating circuit. To increase reliability and eliminate contact
maintenance, this circuit uses a triac instead of a contactor to
initiate the output.
The initiating circuit provides momentary and maintained modes
to control output duration. The momentary mode is used
whenever the output is to be on for a short duration, such as
when performing instantaneous trip tests, or to avoid damage or
overheating of the device under test while setting the test current.
In the maintained mode, the output remains energized until
manually turned off or, when performing timing tests, until the
device under test operates — which both stops the timer and
de-energizes the output.
ContinousAccuracy (overall ammeter system)
±1% of reading, ±1 digit on three high ranges
Regulating: ±1% of range, ±1 digit on low range
Timer
Display
5-digit, extra-bright, LED display with 0.3 in. (7.62mm) numerals
Ranges (switch-selected)
0 to 99.999 s
0 to 999.99 s
0 to 99999 cycles
Accuracy
±0.005% of reading, ±1 digit
Timer Control Circuit
This circuit automatically starts the timer when the output is
energized and automatically stops the timer and de-energizes the
output when the device under test operates. This circuit
accommodates the following test conditions by simple switch
selection of the appropriate mode:
Current Actuated: Used to test a device that has no auxiliary
contacts to monitor, such as a single-pole circuit breaker. The
timer stops when the output current is interrupted.
Normally Closed: Used to test a device with normally closed
contacts. The timer stops and the output is de-energized when the
contacts open.
Normally Open: Used to test a device with normally open
contacts. The timer stops and the output is de-energized when the
contacts close.
Enclosure
The test set is housed in a high strength, molded, suitcase-type
enclosure with carrying handle and removable cover. Storage
space is provided for test leads.
INSTRUMENTATION
Ammeter
Operating Modes (switch-selected)
Memory
Normal
Dimensions
9.9 H x 14 W x 11 D in.
(25 H x 35 W x 28 D cm)
Display
31/2 digit, extra-bright LED display with 0.3 in. (7.62mm) numerals
Ranges (switch-selected)
0 to 1.999/19.99/199.9/750 A
Weight
33 lb (15 kg)
ORDERING INFORMATION
Item (Qty)
Cat. No.
Model MS-2
Item (Qty)
Cat. No.
115 volt input
MS-2-115
No. 4 high-current leads, 5 ft (1.5 m) [2]
230 volt input
MS-2-230
Fuses
5 A, 250 V, MDA [5]
Included Accessories
2265
952
0.125 A, 250 V, MDL [5]
981
1282
10 A, 250 V, MDA [5]
984
Green [50]
2239
Instruction manual [1]
Buff [50]
2238
Timer control circuit leads, 5 ft (1.5 m) [2]
Test and maintenance record cards
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UNITED STATES
4271 Bronze Way
Dallas TX75237-1088 USA
T 800 723 2861 (USA only)
T +1 214 330 3203
F +1 214 337 3038
0.0625 A, 250 V, MDL [5]
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, Toronto CANADA,
Mumbai INDIA, Trappes FRANCE,
Sydney AUSTRALIA, Madrid SPAIN
and the Kingdom of BAHRAIN.
987
8470
Registered to ISO 9001:2000 Reg no. Q 09290
Registered to ISO 14001 Reg no. EMS 61597
MS2_DS_en_V10
www.megger.com
Megger is a registered trademark
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