TE Connectivity 1SNA166551R2600 FIT-1/4-D-2 is a 4-pole ESSAILEC voltage test plug designed for convenient measurement, commissioning and maintenance of industrial secondary circuits.
£38.10
The TE Connectivity 1SNA166551R2600 is a specialist 4-pole voltage test plug designed for use with ESSAILEC measuring and testing systems in industrial electrical installations. Identified as the FIT-1/4-D-2, it provides a practical plug-in interface for carrying out voltage measurement, testing and maintenance procedures on secondary circuits.
ESSAILEC test systems are engineered to simplify diagnostic work on metering, protection and instrumentation circuits while reducing the need to disturb permanent field wiring. The plug-and-socket arrangement allows technicians to connect suitable test equipment quickly and consistently during commissioning, routine maintenance and fault investigation.
The 1SNA166551R2600 features 4 poles with socket-side insertion positions 01-02-03-04. Its compact industrial construction, measuring approximately 83.5 mm deep and 44 mm wide, makes it suitable for professional electrical panels using ESSAILEC test-block assemblies.
ESSAILEC measuring and testing blocks are widely used where electrical measurements, monitoring equipment and protection devices must be checked without unnecessary rewiring. A dedicated voltage plug such as the TE Connectivity 1SNA166551R2600 provides a defined interface between the installed test block and external measuring equipment.
This approach is particularly useful during commissioning, periodic inspection and troubleshooting of electrical systems incorporating meters, protection relays, voltage transformers and monitoring equipment. The modular plug-and-socket principle helps make testing more repeatable while supporting efficient panel maintenance.
| Manufacturer | TE Connectivity |
|---|---|
| Product family | ENTRELEC ESSAILEC |
| Model | FIT-1/4-D-2 |
| Part number | 1SNA166551R2600 |
| Product type | Voltage test plug |
| Number of poles | 4 |
| Insertion positions | 01-02-03-04 |
| Connection orientation | Socket side / right-side test plug configuration |
| Product depth | 83.5 mm |
| Product width | 44 mm |
| Net weight | 80 g |
| EAN | 3472591665512 |
| Typical system mounting | ESSAILEC DIN-rail test-block assembly |
It is a 4-pole voltage test plug used with ESSAILEC measuring and testing systems to connect test equipment to voltage measurement and secondary electrical circuits.
The FIT-1/4-D-2 plug has 4 poles with insertion positions identified as 01-02-03-04.
It belongs to the ENTRELEC ESSAILEC family of measuring and testing products used for industrial electrical testing applications.
The product is approximately 83.5 mm deep and 44 mm wide, with a net weight of approximately 80 g.
It is typically used in switchboards, control panels, metering installations and protection systems where technicians need convenient access to secondary voltage circuits for commissioning, measurement or maintenance.
TE Connectivity ENTRELEC ESSAILEC components provide a modular approach to electrical measurement and test access, helping panel builders, maintenance engineers and commissioning technicians work efficiently with metering and protection circuits.
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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...