TE Connectivity 1SNA199139R2300 D4/8.SNT2.ADO is an 8 mm grey knife-disconnect terminal block with test socket, ADO and screw-clamp connections, a 2.5 mm² rated cross-section, 15 A rated current and 500 V rated voltage.
Replacement product
25655
SKU: 1SNA199137R1100
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£123.48
The TE Connectivity D4/8.SNT2.ADO (1SNA199139R2300) is a knife-disconnect terminal block with an integrated test socket, designed for industrial control, measurement and automation circuits that require convenient isolation and testing. Part of the established ENTRELEC ADO System, it combines an ADO insulation-displacement connection with a conventional screw-clamp connection in a compact DIN rail terminal.
A manually operated disconnect knife blade allows the circuit to be opened directly at the terminal, simplifying isolation during commissioning, testing and troubleshooting. The integrated test facility provides convenient access for electrical measurements, while the mixed ADO and screw-clamp termination arrangement combines rapid ADO wiring with compatibility for conventionally terminated conductors.
The D4/8.SNT2.ADO has a rated cross-section of 2.5 mm², a rated current of 15 A and a rated voltage of 500 V. Its compact 8 mm spacing, IP20 main-terminal protection and wide -55 to +110 °C operating temperature range make it suitable for demanding industrial terminal assemblies.
Disconnect terminal blocks provide a convenient way to open an electrical circuit without removing conductors from the terminal strip. On the D4/8.SNT2.ADO, the hand-operated knife blade provides a clear mechanical disconnect point, making the terminal particularly useful for commissioning, fault-finding and maintenance tasks where circuits need to be isolated individually.
The integrated test facility further supports diagnostic work, while the combination of ADO insulation-displacement and screw-clamp termination gives panel builders flexibility when connecting different wiring arrangements. With an 8 mm footprint and standard TH35 DIN rail mounting, the terminal can be incorporated efficiently into densely populated industrial control panels.
| Manufacturer | TE Connectivity / ENTRELEC |
|---|---|
| Series | ADO System |
| Model | D4/8.SNT2.ADO |
| Part number | 1SNA199139R2300 |
| Product type | Knife-disconnect terminal block with test socket |
| Function | Disconnect |
| Connection type | Screw clamp – ADO System |
| Number of levels | 1 |
| Gauge type | A4 |
| Rated cross-section | 2.5 mm² |
| Screw-clamp flexible conductor capacity | 1 × 0.22–4 mm² |
| Screw-clamp rigid conductor capacity | 1 × 0.2–6 mm² |
| UL/CSA screw-clamp rigid capacity | 2 × 22–14 AWG |
| UL/CSA ADO connecting capacity | Stranded 16 AWG |
| Rated current | 15 A |
| Rated voltage | 500 V |
| Maximum UL/CSA main-circuit operating voltage | 600 V |
| Rated impulse withstand voltage | 6 kV |
| Dielectric test voltage | 2500 V |
| Rated short-time withstand current | 300 A for 1 s |
| Spacing / width | 8 mm |
| Height | 55 mm |
| Depth | 44.5 mm |
| Protection rating | IP20 at main terminals |
| Pollution degree | 3 |
| Insulation material | Polyamide |
| Colour | Grey |
| DIN rail compatibility | TH35-7.5 (35 × 7.5 mm) and TH35-15 (35 × 15 mm) according to IEC 60715 |
| Wire stripping length, screw clamp | 9.5 mm |
| Recommended screwdriver | 4 mm |
| Manufacturer tightening torque | 0.8 N·m |
| Operating temperature | -55 to +110 °C |
| Storage temperature | -55 to +110 °C |
| Flammability rating | UL 94V-0 |
| Product net weight | 11 g |
| ETIM classification | EC000902 – Knife disconnect terminal block |
| EAN | 3472591991390 |
| Standard pack quantity | 50 pieces |
The 1SNA199139R2300 is a D4/8.SNT2.ADO knife-disconnect terminal block with an integrated test socket and a combination of ADO System and screw-clamp connections.
The terminal has a rated current of 15 A, a rated voltage of 500 V and a rated impulse withstand voltage of 6 kV.
The D4/8.SNT2.ADO incorporates a knife disconnect blade operated by hand. Opening the blade interrupts the electrical path through the terminal, allowing the associated circuit to be isolated for testing or maintenance.
The screw-clamp side accepts flexible conductors from 0.22–4 mm² and rigid conductors from 0.2–6 mm².
The terminal block mounts on TH35-7.5 (35 × 7.5 mm) and TH35-15 (35 × 15 mm) DIN rails in accordance with IEC 60715.
TE Connectivity ENTRELEC ADO disconnect terminals provide compact circuit isolation, testing access and flexible conductor termination for industrial automation and control systems where efficient commissioning, troubleshooting and maintenance are essential.
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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...