Atec Megger-MS-2A User Manual

Page 2

MS-2A

Circuit Breaker and Overcurrent Relay Test Set

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.

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

200 (2x)

3 min

8 min

300 (3x)

30 s

4 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.

INSTRUMENTATION
Ammeter

Operating Modes (switch-selected)
Memory

Normal

Display
3

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

ContinousAccuracy (overall ammeter system)
±1% of reading, ±1 digit on three high ranges

±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.

Standards

EN 61326-2-1

EN 61010-1

EN 61010-031

Dimensions

9.9 H x 14 W x 11 D in.

(25 H x 35 W x 28 D cm)

Weight

33 lb (15 kg)

Item (Qty)

Cat. No.

Model MS-2A

115 volt input

MS-2A-115

230 volt input

MS-2A-230

Included Accessories

Test Lead, red, 200cm, [2]

620143

Test Lead, black, 200cm [2]

620144

Alligator clip, red, [2]

684006

Alligator clip, black, [2]

684007

ORDERING INFORMATION

Item (Qty)

Cat. No.

Test and maintenance record cards

Green [50]

2239

Buff [50]

2238

No. 2 high-current leads, 2 ft (0.6 m) [2]

620155

Fuses

0.125 A, 250 V, MDL [5]

981

Instruction manual [1]

750026

Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
[email protected]

UNITED STATES

4271 Bronze Way
Dallas TX 75237-1019 USA
T 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
[email protected]

OTHER TECHNICAL SALES OFFICES

Täby SWEDEN, Norristown USA,
Sydney AUSTRALIA,
Toronto CANADA, Trappes FRANCE,
Kingdom of BAHRAIN, Mumbai INDIA
Johannesburg SOUTH AFRICA
Chonburi THAILAND

ISO STATEMENT

Registered to ISO 9001:2000 Cert. no. 10006.02

MS2A_DS_en_V01