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Megger MS2A Circuit Breaker Relay Test Set
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Product Details
Megger MS2A
The Megger MS2A is a portable, self-contained test set designed for testing a variety of circuit breakers, overload relays, and overcurrent protection devices. This versatile instrument is widely used by utility companies, industrial plants, and electrical service organizations around the world.
Key Features
- Lightweight and Rugged Design: Weighing only 33 lbs (15 kg), the MS2A is tough enough to withstand daily field or plant use while remaining portable.
- High-Current Output: The test set can provide instantaneous currents up to 750 amperes through a 125 ampere breaker, allowing for effective testing of overcurrent protection devices.
- Digital Memory Ammeter: The high-accuracy, direct-reading ammeter has a read-and-hold memory function for measuring short-duration currents, making it ideal for testing ground fault devices, overcurrent relays, and molded-case circuit breakers.
- Digital, Multirange Timer: The crystal-controlled, high-accuracy timer with autoranging measures operating time to 1 millisecond, ensuring precise timing measurements.
- Solid-State Output Initiate Circuit: The MS2A uses a solid-state output initiating circuit with a triac instead of a contactor, increasing reliability and eliminating the need for contact maintenance.
Applications
The Megger MS2A is capable of testing a wide range of devices, including:
- Overcurrent Relays: The test set can test the time-delay characteristics of overcurrent relays rated up to 125 amperes when following the recommended test procedure of testing at three times their rating.
- Motor Overload Relays: Thermal, magnetic, or solid-state motor overload relays can be tested using the MS2A.
- Molded-Case Circuit Breakers: The test set can test molded-case circuit breakers rated up to 125 amperes, including ground-fault trip devices.
- Ground Fault Performance Testing: The MS2A is commonly used for ground fault performance testing as required by NEC 230.95 when ground fault protection devices are initially installed.
- Additional applications include verifying the ratio of current transformers and testing panelboard ammeters and voltmeters.
The Megger MS2A is a versatile and reliable test set that simplifies the testing of circuit breakers, overload relays, and overcurrent protection devices. Its high-current output, precise timing measurements, and rugged design make it an essential tool for electrical maintenance and testing professionals.
Megger MS2A Specifications
| 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) |
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Megger MS2A Circuit Breaker Relay Test Set
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