1sna166913r1100 – m20-c5a

Why Choose the TE Connectivity M20-C5A ESSAILEC Multicircuit Socket?

The TE Connectivity M20-C5A (1SNA166913R1100) is an ENTRELEC ESSAILEC 20-point multicircuit test socket designed for electrical protection, metering, measurement and commissioning systems. Part of the established ESSAILEC test block range, it provides a dedicated interface between permanently installed secondary circuits and compatible test equipment.

The M20-C5A uses a half-base mounting configuration, providing twenty connection points within a compact assembly measuring approximately 63 × 44 mm across its main body. The corresponding mounting arrangement uses a 44 × 50 mm panel cut-out with four fixing holes, supporting secure integration into protection and metering panels.

ESSAILEC multicircuit technology allows engineers to perform current and voltage measurement, monitoring, test injection, commissioning and replacement of meters or protection relays through a structured plug-and-socket interface. Its make-before-break operating principle supports controlled testing of compatible current transformer circuits while reducing unnecessary disturbance of permanent installation wiring.

Key Advantages

• 20-point multicircuit socket consolidates numerous test connections into one compact ESSAILEC assembly.
• Half-base mounting supports neat integration into electrical protection and metering panels.
• Designed for simultaneous testing of multiple secondary electrical circuits.
• Supports current and voltage measurement, monitoring and test injection.
• ESSAILEC make-before-break operation supports controlled current transformer testing.
• Dedicated plug-and-socket architecture helps reduce repeated disturbance of permanent wiring.
• Suitable for meter and protection relay testing, servicing and replacement.

Key Features

• TE Connectivity ENTRELEC ESSAILEC series.
• M20-C5A multicircuit socket.
• 20-point configuration.
• Half-base mounting design.
• Compact 44 mm wide multicircuit format.
• Four-hole panel fixing arrangement.
• Make-before-break contact principle within compatible ESSAILEC test arrangements.
• Designed for secondary current and voltage circuits.
• Supports protection relay and meter testing.
• Suitable for measurement, monitoring, injection, commissioning and maintenance.

Reliable Multicircuit Testing for Protection and Metering Systems

ESSAILEC test blocks are designed to simplify testing operations on secondary circuits connected to current transformers, voltage transformers, sensors, meters and protection relays. By combining a permanently installed socket with compatible removable test equipment, engineers can perform measurement, monitoring, injection and maintenance through an organised interface.

The M20-C5A extends this approach to a 20-point multicircuit configuration, making it particularly useful where numerous secondary connections need to be accessed during commissioning or servicing. The ESSAILEC make-before-break principle also enables compatible current transformer circuits to be short-circuited automatically as part of the test connection sequence without requiring separate manually operated switching elements.

Typical Applications

• Current transformer secondary circuits.
• Voltage transformer secondary circuits.
• Protection relay testing and commissioning.
• Electrical energy metering systems.
• Measurement and monitoring circuits.
• Test signal and injection applications.
• Substation protection and control panels.
• Switchgear testing and maintenance.