1sna206721r0100 – al4-m3 test socket [pk=50]

Why Choose the TE Connectivity 1SNA206721R0100 AL4-M3 Test Socket?

The TE Connectivity 1SNA206721R0100, also identified as AL4-M3, is a 4 mm test socket designed for compatible ENTRELEC SNA terminal block assemblies. It provides a dedicated access point for test plugs, allowing engineers to perform electrical measurements, commissioning and diagnostic checks without unnecessarily disturbing permanent field wiring.

The AL4-M3 screws into the threaded hole provided in the connector bar of compatible terminal blocks. It features an M3 screw mounting and a 4 mm socket diameter, providing a straightforward test connection for industrial control, measurement and power-distribution applications.

With compact dimensions of approximately 5 × 5 × 12.5 mm and a net weight of approximately 1.1 g, the AL4-M3 adds convenient test access while requiring minimal space within the terminal assembly. It is supplied in a manufacturer pack quantity of 50.

Key Advantages

• Provides a dedicated 4 mm test socket for compatible terminal blocks.
• Allows testing and measurement without disconnecting permanent field conductors.
• M3 screw mounting provides direct installation into the terminal connector bar.
• Compact dimensions minimise additional space requirements within terminal assemblies.
• Suitable for a broad range of compatible ENTRELEC SNA terminal blocks.
• Wide operating temperature range of -55 to +110 °C for industrial environments.

Key Features

• TE Connectivity / ENTRELEC AL4-M3 test socket.
• Manufacturer part number 1SNA206721R0100.
• 4 mm test socket diameter.
• M3 screw mounting arrangement.
• Single-pole terminal accessory.
• Designed to screw into the threaded connector-bar hole of compatible terminal blocks.
• Compact 5 × 5 × 12.5 mm dimensions.
• Manufacturer pack quantity of 50.

Reliable Test Access for Industrial Terminal Blocks

Dedicated test sockets simplify commissioning, maintenance and fault finding by providing accessible measurement points directly at the terminal assembly. The TE Connectivity AL4-M3 screws into the appropriate threaded connector-bar opening and provides a 4 mm test interface, allowing test equipment to be connected without altering the permanent conductor arrangement.

The AL4-M3 is compatible with numerous ENTRELEC terminal types, including selected D2.5/8, D4/8, D6/8, M4/6, M6/8, M10/10, M16/12, ML10/13, MU10/13 and ZS10 configurations. This versatility makes it a useful accessory for control panels, measurement circuits, machinery and industrial power-distribution installations.

Typical Applications

• Industrial terminal block testing and measurement.
• Control-panel commissioning and diagnostics.
• Current and voltage measurement circuits.
• PLC and industrial automation systems.
• Machinery electrical cabinets.
• Switchgear and power-distribution assemblies.