TE Connectivity 1SNA166638R0500 COR-C-R1-6.6 is a 2 × 4-pole 400 V 15 A ENTRELEC ESSAILEC prewired current test plug with 2.5 mm² conductors, 2 m leads and colour-coded bayonet safety test connections for current transformer, protection and metering circuits.
£458.87
The TE Connectivity 1SNA166638R0500 is a specialised prewired current test plug designed for safe and efficient testing of current transformer secondary circuits, protection relays and electrical metering systems. Also identified as the COR-C-R1-6.6, this component forms part of the established ENTRELEC ESSAILEC measuring and testing range and combines a 2 × 4-pole current plug with factory-wired test leads.
Designed to simplify commissioning and maintenance, the COR-C-R1-6.6 is supplied prewired with 2.5 mm² conductors and 2 m cable length. The assembly incorporates four green and four red bayonet safety test plugs, providing convenient connection to compatible test and measurement equipment while reducing the preparation required for routine electrical testing.
The ESSAILEC current testing system uses a make-before-break contact principle, allowing current transformer secondary circuits to be automatically short-circuited during the testing sequence. Rated at 400 V and 15 A, with a 4 kV impulse withstand voltage, the 1SNA166638R0500 provides a purpose-built solution for demanding protection, metering and utility applications.
Current transformer secondary circuits require specialised testing arrangements because the secondary should not be left open-circuit while the primary is energised. ESSAILEC test systems address this requirement through a make-before-break contact sequence that automatically establishes the necessary short-circuit path during connection and disconnection procedures.
The COR-C-R1-6.6 combines this dedicated current testing interface with factory-wired leads and colour-coded bayonet safety connectors. This enables engineers to connect measurement or injection equipment quickly and consistently, making the assembly particularly useful for protection relay commissioning, energy metering verification, substation maintenance and routine electrical testing.
| Manufacturer | TE Connectivity / ENTRELEC |
|---|---|
| Series | ESSAILEC |
| Model | COR-C-R1-6.6 |
| Manufacturer part number | 1SNA166638R0500 |
| Product type | Prewired current test plug |
| Plug configuration | 2 × 4 poles |
| Plug colour | Green |
| Test connections | 4 green and 4 red bayonet safety test plugs |
| Conductor cross-section | 2.5 mm² |
| Cable length | 2 m |
| Rated voltage | 400 V |
| Rated current | 15 A |
| Impulse withstand voltage | 4 kV |
| Short-circuit withstand | 100 A for 5 s / 200 A for 1 s |
| Housing material | Polycarbonate |
| Conductive parts | Gold-plated |
| Pollution degree | 3 |
| Operating temperature range | -10–55 °C |
| Storage temperature range | -25–70 °C |
| Product width | 44 mm |
| Product net weight | approx. 1080 g |
| EAN | 3472591666380 |
| Pack quantity | 1 |
The 1SNA166638R0500 COR-C-R1-6.6 is a prewired current test plug designed for testing, commissioning and maintenance of current transformer secondary circuits, protection relays and electrical metering systems.
The COR-C-R1-6.6 incorporates a 2 × 4-pole green current plug, four green and four red bayonet safety test plugs, and prewired 2.5 mm² conductors with a 2 m cable length.
The COR-C-R1-6.6 is rated at 400 V and 15 A with an impulse withstand voltage of 4 kV.
The ESSAILEC make-before-break principle allows the current transformer secondary circuit to be short-circuited before the measurement circuit is disconnected, supporting safer testing without requiring a separate manually operated shorting device.
The COR-C-R1-6.6 is suitable for current transformer circuits, protection relay systems, electrical metering, substations and switchgear where fast and repeatable access is required for current measurement, testing and maintenance.
TE Connectivity ENTRELEC ESSAILEC prewired test solutions provide structured access to current transformer, protection and measurement circuits, combining dedicated test connections with factory-wired leads to support efficient commissioning, diagnostics and maintenance.
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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...