Name: MEGGER MS2A Circuit Breaker Relay Test Set
Brand: Megger
SKU: 4956

MEGGER MS2A Circuit Breaker Relay Test Set

The Megger MS2A Circuit Breaker Relay Test Set is a high-precision, crystal-controlled instrument that is highly regarded in the field for its reliability and accuracy in overcurrent relay testing. Known for its lightweight and portable design, this primary injection test instrument is essential for utility companies, industrial plants, and electrical service organizations worldwide.

One of the standout features of the MS2A is its ability to measure operating times with millisecond precision, ensuring detailed and accurate testing outcomes. This capability is crucial for analyzing the time-delay characteristics of overcurrent relays, motor overload relays, and molded-case circuit breakers with ratings up to 125 amperes. Following the recommended test procedures, it effectively tests the time delay of these devices at three times their rated current, providing a comprehensive evaluation of their operational integrity.

In scenarios requiring high current output, the MS2A excels by offering short-duration currents up to 750 amperes. This feature is particularly useful for testing the instantaneous trip elements of circuit breakers, allowing for precise calibration and verification of their protective functions.

Additionally, the MS2A is optimized for earth/ground fault performance testing, aligning with NEC 230.95 requirements. This makes it an ideal solution for testing earth/ground fault protection devices with window CT’s, especially when they are initially installed. The NEC 230.95C mandates that specific earth/ground fault devices undergo performance testing to ensure they meet safety standards, and the MS2A provides the necessary capabilities to conduct these tests efficiently and effectively.

MEGGER MS2A Circuit Breaker Relay Test Set specifications:

Input
Input Voltage (specify one):120 V OR240 V, 50/60 Hz, 1φ
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.
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 the 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.
Ammeter
Percent Rated Current:100 (1x) 200 (2x) 300 (3x)
Maximum Time On:30 min 3min 3s
Minimum Time Off:30min 8min 1min
Operating Modes (switch-selected): Memory Normal
Display:31/2digit, extra-bright LED display with 0.3 in. (7.62mm) numerals
Ranges (switch-selected):0 to 1.999/19.99/199.9/750A
ContinousAccuracy (overall ammeter system) :±1% of reading, ±1 digit on three high ranges±1% of range, ±1 digit on low range
Standards
CE
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)

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Brand

Megger

Megger since 1889 is a leading global premium manufacturer of measurement and testing technology. Megger top priority has always been to make your everyday work easier and safer. As such, insulation testers, micro-ohmmeters, and multimeters are among the long line of Megger inventions, making this brand one of the pioneers in the electrical industry. Megger products combine many years of experience and the valued feedback from our global users with the inventiveness and conscientiousness of our product developers. In Germany, we manufacture at three sites, Aachen, and Baunach near Bamberg and Radeburg near Dresden. Other manufacturing locations are based in Sweden, England, and America.

DATA SHEET

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specifications

Technical Specifications

Category	Specification
Input Voltage	120 V OR 240 V, 50/60 Hz, 1φ
Output Ranges	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. It can provide several times their current rating if the output voltage is sufficient to push the desired current through the test circuit.
Overload Capability	Current ratings may be exceeded for short durations. The output current magnitude is determined by the impedance of the load circuit.
Ammeter	Percent Rated Current: 100 (1x), 200 (2x), 300 (3x) Maximum Time On: 30 min, 3 min, 3 s Minimum Time Off: 30 min, 8 min, 1 min Operating Modes: Memory, Normal Display: 3.5 digit, extra-bright LED display with 0.3 in. (7.62mm) numerals Ranges: 0 to 1.999/19.99/199.9/750A Continuous Accuracy: ±1% of reading, ±1 digit on three high ranges, ±1% of range, ±1 digit on low range
Standards	CE 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)