TE Connectivity TO-D-VA 1SNA166744R0700 is an 8 A, 400 V ENTRELEC ESSAILEC voltage test socket with open contacts, ring-tongue termination and half-base mounting for voltage-transformer secondary circuits.
£118.02
The TE Connectivity TO-D-VA 1SNA166744R0700 is a voltage test socket with open contacts from the established ENTRELEC ESSAILEC test block range. Designed for voltage-transformer secondary circuits, it provides a dedicated interface for testing, measurement, monitoring and maintenance in switchgear, metering and electrical protection installations.
The TO-D-VA uses a half-base mounting arrangement with ring-tongue connections, providing a secure method of terminating permanent panel wiring. Its open-contact configuration is specifically designed for voltage applications, while the grey housing follows the ESSAILEC identification scheme for this type of test circuit.
Rated at 8 A and 400 V, the TO-D-VA is designed for professional test systems where controlled access to secondary voltage circuits is required. It weighs approximately 139 g and can be used with compatible ESSAILEC accessories and test plugs, including the CPT-2 cover and FI-2/4-DIA4 universal test plug.
ESSAILEC test blocks are designed to simplify electrical testing operations including voltage measurement, monitoring, signal injection and the maintenance or replacement of meters and protection relays. The plug-and-socket architecture gives engineers a defined test interface while helping avoid unnecessary alteration of permanently installed secondary wiring.
The TO-D-VA combines open contacts, ring-tongue termination and half-base mounting in a configuration intended for voltage applications. Used with the appropriate ESSAILEC plug and accessories, it provides a repeatable connection point for commissioning, routine testing and maintenance in utility and industrial electrical systems.
| Manufacturer | TE Connectivity |
|---|---|
| Brand / range | ENTRELEC |
| Series | ESSAILEC |
| Model | TO-D-VA |
| Manufacturer part number | 1SNA166744R0700 |
| Product type | Voltage test socket / fixed terminal block |
| Application | Voltage-transformer secondary circuits |
| Contact configuration | Open contacts |
| Rated current | 8 A |
| Rated voltage | 400 V |
| Connection type | Ring-tongue |
| Mounting type | Half-base mounting |
| Colour | Grey |
| Short-circuit withstand | 25 A / 5 s to 800 A / 25 ms |
| Dielectric withstand voltage | 4000 V |
| Pollution degree | 3 |
| Working temperature range | -10–55 °C |
| Storage temperature range | -25–70 °C |
| Protection rating | IP20; IP40 with compatible cover |
| Weight | approx. 139 g |
| Compatible cover | CPT-2 |
| Compatible universal plug | FI-2/4-DIA4 |
| Pack quantity | 1 |
| EAN | 3472591667448 |
The TO-D-VA is an ENTRELEC ESSAILEC voltage test socket with open contacts, designed for testing and measurement applications in voltage-transformer secondary circuits.
The TO-D-VA has a rated current of 8 A and a rated voltage of 400 V.
The TO-D-VA uses ring-tongue connections for secure termination of the permanent wiring behind the ESSAILEC test interface.
The TO-D-VA is designed for half-base mounting within compatible ESSAILEC test-block installations.
The TO-D-VA is compatible with the CPT-2 cover and FI-2/4-DIA4 universal test plug, as well as selected COR-T pre-wired ESSAILEC plugs for voltage-transformer applications.
TE Connectivity ENTRELEC ESSAILEC test blocks provide a modular plug-and-play connection platform for voltage measurement, monitoring, commissioning and protection applications where controlled and repeatable access to transformer secondary circuits is required.
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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...