TE Connectivity M20-C5A 1SNA166913R1100 is an ENTRELEC ESSAILEC 20-point half-base mounting multicircuit test socket designed for current and voltage measurement, monitoring, protection, commissioning and maintenance applications.
£100.00
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.
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.
| Manufacturer | TE Connectivity / ENTRELEC |
|---|---|
| Series | ESSAILEC |
| Model | M20-C5A |
| Manufacturer part number | 1SNA166913R1100 |
| Product type | Multicircuit test socket |
| Number of points | 20 |
| Mounting configuration | Half-base mounting |
| Main body height | 63 mm |
| Main body width | 44 mm |
| Panel cut-out | 44 × 50 mm |
| Fixing holes | 4 × Ø2.5 mm |
| Vertical fixing dimension | 56.5 mm |
| Contact principle | Make-before-break within compatible ESSAILEC test arrangements |
| Application | Current and voltage measurement, monitoring, injection and electrical testing |
| Pack quantity | 5 |
| EAN | 3472591669138 |
The M20-C5A is an ENTRELEC ESSAILEC 20-point multicircuit test socket designed for electrical measurement, monitoring, protection, commissioning and maintenance applications.
The M20-C5A provides 20 connection points, allowing multiple secondary electrical circuits to be incorporated into a single ESSAILEC test interface.
The TE Connectivity M20-C5A uses a half-base mounting configuration with a 44 × 50 mm panel cut-out and four Ø2.5 mm fixing holes.
The ESSAILEC system is designed for current and voltage measurement, monitoring, test injection, meter servicing and protection relay testing within secondary electrical circuits.
The make-before-break principle establishes the required test connection before the original circuit is interrupted, allowing compatible current transformer circuits to be short-circuited automatically during the ESSAILEC test connection sequence.
TE Connectivity ENTRELEC ESSAILEC test blocks provide dependable, organised interfaces for measurement, monitoring, commissioning and maintenance operations across industrial and utility protection and metering systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...