Megger MS-2A Circuit breaker and overcurrent relay test set

Description

Reliable Solution for Breaker and Relay Tests

The Megger MS-2A Circuit Breaker and Overcurrent Relay Test Set stands as a reliable and cost-effective solution for professionals involved in the maintenance, testing, and certification of circuit protection devices. Utility companies, industrial plants, and electrical service organizations across the globe utilize the MS-2A to ensure the proper functioning and safety of their overcurrent relays, motor overload relays, molded-case circuit breakers, and ground-fault protection devices. This popularity is rooted in the MS-2A’s unique blend of accuracy, robust construction, lightweight design, and flexible functionality, making it an essential part of any electrical maintenance toolkit. Designed to meet the demands of a wide range of test environments and applications, the MS-2A seamlessly delivers dependable results whether used in the field or in the lab.

Wide Range of Compatible Device Applications

One of the standout features of the MS-2A is its broad applicability for various devices crucial to power system safety and management. Specifically, the MS-2A is engineered to test the time-delay characteristics of overcurrent relays, thermal, magnetic or solid-state motor overload relays, and molded-case circuit breakers rated up to 125 amperes. When following recommended procedures, such as testing devices at three times their rating, the MS-2A ensures compliance and reliability in protective coordination. Additionally, for instantaneous trip testing, the unit can deliver a short-term maximum output of 750 amperes through standard molded-case circuit breakers. The MS-2A is also highly regarded for its ability to test ground fault protection systems with window current transformers, meeting the stringent requirements set by standards such as NEC 230.95C for newly-installed devices.

Core Features and User-Focused Design Benefits

The Megger MS-2A is built to withstand rigorous daily use, both in the field and in industrial environments. Weighing only 33 pounds (15 kg), it is exceptionally portable without sacrificing durability, thanks to its tough, high-strength, molded suitcase-type enclosure. The built-in storage compartment provides ample space for test leads and accessories, ensuring everything required is close at hand during onsite deployments. Technologically, the test set integrates a digital memory ammeter featuring direct reading and a “read-and-hold” function for capturing and displaying short-duration currents—ideal for precise documentation and troubleshooting. The crystal-controlled timer, autoranging and accurate to the millisecond, increases operator confidence during critical timing measurements. These well-rounded features collectively position the MS-2A as a market leader in circuit protection testing solutions.

Flexible Output and Impressive Overload Capability

The MS-2A test set offers comprehensive output versatility to accommodate a variety of test circuit impedances and requirements. Four continuously adjustable output ranges are available: 0 to 5 A at 120 V max; 0 to 25 A at 24 V max; 0 to 120 A at 6 V max; and 0 to 240 A at 3 V max. This flexibility ensures compatibility with a broad array of devices and situations encountered by maintenance personnel. The output circuitry is specifically engineered for robust short-duration overloads, enabling testers to easily simulate and measure conditions such as instantaneous trip elements or high inrush currents. For example, the set can provide 750 amperes for short periods—sufficient to verify the correct operation of the instantaneous trip mechanisms in 125 A molded-case circuit breakers, following industry-standard testing techniques. The solid-state output initiate circuit, featuring a triac, increases operational reliability, reduces the need for maintenance, and offers both momentary and maintained output modes to match the specific needs of each test.

Intuitive Instrumentation and Precise Measurement Controls

Instrument accuracy and ease of use are critical for effective protective device testing, and the MS-2A excels in both areas. The ammeter section provides four selectable ranges, from 0–1.999/19.99/199.9/750 amperes, and an extra-bright LED display with memory and normal modes, maintaining ±1% accuracy for most testing scenarios. The timer section, similarly advanced, features a 5-digit LED display—allowing measurements up to 99.999 seconds or 99,999 cycles with a resolution of 1 millisecond and an accuracy of ±0.005%. The automatic timer control circuit simplifies operation by starting the timer when the output is energized and stopping it when the device under test operates, thereby reducing human error and improving repeatability. Switch-selectable modes allow for testing devices that are current-actuated or that use normally open or normally closed contacts.

Practical Field Applications Across Many Industries

In practical terms, the MS-2A is routinely used by power utilities for routine relay and circuit breaker maintenance, newly installed ground fault device testing as required by code NEC 230.95, thermal/magnetic overload relay verification, and quickly identifying issues in molded-case breakers and motor protection schemes. Its portability and design make it ideal for field use in substations and plants, and its high current and precise timing capabilities mean it can be relied upon for even the most demanding protection device assessments. Additionally, its usefulness extends to verifying the ratio accuracy of current transformers and for functional tests of panelboard ammeters and voltmeters—further broadening its application scope in electrical service and facility management.

tpt24: Trusted Global Supplier for Megger Products

When considering where to purchase the Megger MS-2A Circuit Breaker and Overcurrent Relay Test Set, customers worldwide turn to tpt24—the leading global online store for authentic Megger products. tpt24 stands above competitors by offering a comprehensive guarantee on product authenticity and quality, coupled with reliable international shipping to any country. Whether you are an engineer managing substations, a maintenance professional at an industrial plant, or a purchasing agent for a utility company, tpt24 ensures that your MS-2A is delivered quickly and securely, with the added assurance of direct manufacturer support and documentation. This commitment to service and customer satisfaction makes tpt24 the smart choice for acquiring the MS-2A and other essential electrical testing equipment.

Summary

In summary, the Megger MS-2A stands as a high-performance, portable, and cost-effective instrument, trusted by professionals around the world for the testing of overcurrent relays, motor overload relays, molded-case circuit breakers, and ground fault protection systems. Its versatility, accuracy, and ease of use set it apart, while its rugged construction ensures years of dependable service. With comprehensive worldwide support through tpt24, there is no better choice for critical circuit protection testing requirements.