TE Connectivity D4/8.SNNT2.I.ADO 1SNA399779R2400 is a 10 A, 630 V disconnect terminal block combining ADO and screw-clamp connections with a lever-operated disconnect and two 2 mm test sockets for industrial control and automation circuits.
£6.05
The TE Connectivity D4/8.SNNT2.I.ADO 1SNA399779R2400 is a compact disconnect terminal block with ADO and screw-clamp connections, designed for circuit isolation, testing and industrial control wiring. Part of the established TE Connectivity Entrelec ADO System, it combines rapid ADO conductor termination with a conventional screw-clamp connection and a practical lever-operated disconnect function.
The D4/8.SNNT2.I.ADO incorporates two 2 mm test sockets, providing convenient access for electrical measurement, commissioning and fault finding. With an IEC rated current of 10 A, rated voltage of 630 V and rated cross-section of 1.5 mm², it is well suited to control, instrumentation and automation circuits where individual connections need to be isolated or tested.
Its compact 8 mm spacing and compatibility with TH35 DIN rails make the 1SNA399779R2400 straightforward to integrate into industrial control cabinets. The grey and blue housing, IP20 main-terminal protection and combination of ADO and screw-clamp termination provide a versatile solution for professional panel-building applications.
Disconnect terminal blocks allow individual electrical circuits to be opened for testing, commissioning and maintenance while leaving the connected conductors securely terminated. The D4/8.SNNT2.I.ADO incorporates a lever-operated disconnect mechanism together with two 2 mm test sockets, providing practical access for measurement and troubleshooting within control panels.
The combination of ADO and screw-clamp termination provides additional wiring flexibility. The ADO System supports rapid conductor termination and up to two wires per connection, while the screw-clamp side accommodates rigid conductors up to 4 mm² and flexible conductors up to 4 mm². This makes the terminal particularly useful where fast panel wiring must be combined with conventional field-side connections.
| Manufacturer | TE Connectivity / Entrelec |
|---|---|
| Series | ADO System |
| Model | D4/8.SNNT2.I.ADO |
| Manufacturer part number | 1SNA399779R2400 |
| Product type | Disconnect IDC terminal block |
| Function | Disconnect with lever and test sockets |
| Connection technology | ADO System / screw clamp |
| Rated current | 10 A IEC |
| Rated voltage | 630 V IEC |
| Rated impulse withstand voltage | 8 kV |
| Rated cross-section | 1.5 mm² |
| Rated short-time withstand current | 180 A for 1 s |
| ADO conductor range | 0.34–1.5 mm² |
| Screw-clamp rigid conductor range | 0.2–4 mm² |
| Screw-clamp flexible conductor range | 0.22–4 mm² |
| ADO wires per connection | Up to 2 |
| Test sockets | 2 × 2 mm diameter |
| Number of levels | 1 |
| Wire stripping length | 9.5 mm |
| Recommended screwdriver | 4 mm |
| Tightening torque | 0.5–0.8 N·m |
| Protection rating | IP20 at main terminals |
| NEMA protection | NEMA 1 |
| Pollution degree | 3 |
| Insulation material | Polyamide |
| Colour | Grey / blue |
| Mounting type | DIN rail mounting |
| Compatible rails | TH35-7.5 and TH35-15 |
| Width / spacing | 8 mm |
| Height | 68.2 mm |
| Depth | 40.9 mm |
| Operating temperature | -55 to +110 °C |
| Storage temperature | -55 to +110 °C |
| Weight | approx. 13 g |
| Pack quantity | 50 |
| Barcode / EAN | 3472593997796 |
The D4/8.SNNT2.I.ADO is a disconnect terminal block with ADO and screw-clamp connections, a lever-operated disconnect mechanism and two 2 mm test sockets for industrial control and automation circuits.
The terminal block has an IEC rated current of 10 A, a rated voltage of 630 V and a rated cross-section of 1.5 mm². Its rated impulse withstand voltage is 8 kV.
Yes. The D4/8.SNNT2.I.ADO incorporates two 2 mm diameter test sockets for convenient electrical measurement, commissioning and fault finding.
The ADO connection accepts conductors from 0.34–1.5 mm². The screw-clamp connection accepts rigid conductors from 0.2–4 mm² and flexible conductors from 0.22–4 mm².
The terminal is designed for DIN rail mounting and is compatible with TH35-7.5 and TH35-15 rails. It has a compact width of 8 mm, a height of 68.2 mm and a depth of 40.9 mm.
TE Connectivity Entrelec ADO disconnect terminal blocks combine efficient conductor termination with practical isolation and testing features, providing dependable connectivity for panel builders, machine builders, automation engineers and industrial maintenance applications.
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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...