1sna116861r1300 – m30pwa

Why Choose the TE Connectivity M30-D-PWA 1SNA116861R1300 ESSAILEC Test Block?

The TE Connectivity M30-D-PWA 1SNA116861R1300, also identified as M30PWA, is an industrial ESSAILEC test and disconnect block designed for safe testing and measurement operations in secondary current and voltage circuits. The ESSAILEC system provides a dedicated interface between measurement or protection equipment and associated current transformers, voltage transformers and sensors.

ESSAILEC test blocks are engineered to simplify operations such as current and voltage measurement, monitoring, signal injection, testing, repair and replacement of meters and protection relays. The system uses a coordinated plug-and-base arrangement, enabling test equipment to be connected quickly while permanent installation wiring remains organised and protected.

A key benefit of the ESSAILEC architecture is its make-before-break contact principle. In compatible current-transformer circuits, this allows automatic CT short-circuiting during test operations without requiring separate manually operated sliders or switching components. The system also incorporates coding and reverse-insertion protection to help prevent connection errors during commissioning and maintenance.

Key Advantages

• Purpose-designed ESSAILEC test and disconnect solution for electrical measurement and protection circuits.
• Supports current measurement, voltage measurement, monitoring and test-signal injection.
• Facilitates servicing or replacement of compatible meters and protection relays.
• Make-before-break contact principle supports safe and efficient test procedures.
• ESSAILEC architecture can automatically short-circuit compatible current-transformer secondary circuits during testing.
• Plug-and-play system helps reduce the time required for commissioning and maintenance operations.
• Mechanical coding and reverse-insertion protection help minimise connection errors.

Key Features

• TE Connectivity / ENTRELEC ESSAILEC test-block system.
• M30-D-PWA manufacturer designation.
• Also referenced as M30PWA.
• Designed for disconnect and measurement applications.
• Suitable for secondary circuits associated with current and voltage measurement.
• Supports testing of measurement and protection equipment.
• ESSAILEC plug-and-base architecture.
• Make-before-break contact principle within compatible ESSAILEC test circuits.
• Coding system helps prevent connection between incompatible circuits.
• Protection against reverse plug insertion.
• Designed for professional industrial test and maintenance applications.

Safe and Efficient ESSAILEC Testing

Electrical measurement and protection circuits often need to be tested without unnecessarily disturbing permanent wiring or interrupting associated equipment. The M30-D-PWA forms part of the ESSAILEC system developed specifically for this purpose, providing an engineered interface for connecting test equipment to secondary current and voltage circuits.

The ESSAILEC make-before-break principle is particularly valuable in current-transformer applications. When used in the appropriate ESSAILEC circuit configuration, the system automatically establishes the required short circuit before opening the measurement path, avoiding the need to operate separate shorting links manually. This helps engineers perform commissioning, diagnostic and maintenance procedures quickly while maintaining a controlled test sequence.

Typical Applications

• Current-transformer secondary test circuits.
• Voltage-transformer secondary test circuits.
• Electrical metering installations.
• Protection relay testing and maintenance.
• Current and voltage measurement systems.
• Substation protection and control panels.
• Power distribution and switchgear assemblies.
• Industrial monitoring and instrumentation systems.
• Commissioning and diagnostic test interfaces.