TE Connectivity / ENTRELEC 1SNA399777R1200 D4/8.SFT2.I.ADO is an 8 mm-wide 6.3 A 630 V fuse DIN rail terminal block for 5 × 20 mm and 5 × 25 mm fuses with ADO and screw-clamp connections and two 2 mm test sockets.
£5.06
The TE Connectivity / ENTRELEC D4/8.SFT2.I.ADO, manufacturer part number 1SNA399777R1200, is a compact fuse DIN rail terminal block with ADO and screw-clamp connections designed for circuit protection, testing and reliable conductor termination in industrial control panels, machinery and automation systems. Part of the established ENTRELEC ADO System terminal block range, it accepts standard 5 × 20 mm and 5 × 25 mm cartridge fuses.
The D4/8.SFT2.I.ADO combines the speed and reliability of ADO insulation displacement connection technology with a conventional screw-clamp connection. This hybrid arrangement gives panel builders flexibility when terminating field and control wiring, while the ADO connection can accommodate up to two conductors per connection. The integrated fuse holder allows individual circuits to be protected without requiring a separate panel-mounted fuse carrier.
With a rated current of 6.3 A, rated voltage of 630 V and rated cross-section of 1.5 mm², the 1SNA399777R1200 is well suited to protected industrial control and instrumentation circuits. Two integrated 2 mm test sockets provide convenient access for electrical measurements during commissioning, diagnostics and maintenance, while its compact 8 mm-wide profile helps conserve DIN rail space.
Fuse terminal blocks combine conductor termination and overcurrent protection within a single DIN rail component, helping panel builders create compact and organised protected circuits. The D4/8.SFT2.I.ADO accepts standard 5 × 20 mm and 5 × 25 mm cartridge fuses, allowing individual circuits to be protected without requiring separate fuse holders elsewhere in the control cabinet.
The two integrated 2 mm test sockets provide convenient access for electrical measurement and diagnostics. Combined ADO and screw-clamp termination gives installers flexibility when connecting field and panel wiring, while the compact 8 mm profile makes the terminal particularly useful in densely populated industrial control cabinets.
| Manufacturer | TE Connectivity / ENTRELEC |
|---|---|
| Series | ADO System |
| Model | D4/8.SFT2.I.ADO |
| Manufacturer part number | 1SNA399777R1200 |
| Product type | Fuse IDC DIN rail terminal block |
| Function | Fuse protection with test sockets |
| Fuse sizes | 5 × 20 mm / 5 × 25 mm |
| Test sockets | 2 × 2 mm diameter |
| Rated cross-section | 1.5 mm² |
| Rated current | 6.3 A |
| Rated voltage | 630 V |
| Rated impulse withstand voltage | 8,000 V |
| Rated short-time withstand current | 180 A for 1 s |
| ADO rigid conductor range | 0.34–1.5 mm² |
| ADO flexible 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 |
| Connection technology | ADO System / screw clamp |
| Wire stripping length | 9.5 mm |
| Screw tightening torque | 0.5–0.8 N·m |
| Recommended screwdriver | 4 mm flat blade |
| Protection rating | IP20 |
| Mounting type | TH 35-7.5 / TH 35-15 DIN rail |
| Insulation material | Polyamide |
| Operating temperature | -55–110 °C |
| Storage temperature | -55–110 °C |
| Colour | Grey |
| Width / spacing | 8 mm |
| Height | 68.2 mm |
| Depth | 40.9 mm |
| Weight | approx. 13 g |
| Pack quantity | 50 |
The D4/8.SFT2.I.ADO is a fuse DIN rail terminal block used to provide circuit protection and conductor termination in industrial control, instrumentation, machinery and automation systems.
The terminal block is designed for standard 5 × 20 mm and 5 × 25 mm cartridge fuses. The appropriate fuse is selected separately according to the protected circuit.
The D4/8.SFT2.I.ADO has a rated current of 6.3 A, a rated voltage of 630 V and a rated cross-section of 1.5 mm².
Yes. The 1SNA399777R1200 incorporates two 2 mm test sockets, providing convenient electrical access for commissioning, measurement, fault finding and maintenance.
The terminal combines a standard screw-clamp connection with ENTRELEC ADO System insulation displacement technology. The ADO connection can accommodate up to two conductors per connection.
TE Connectivity / ENTRELEC ADO fuse terminal blocks provide panel builders, machine builders and automation engineers with compact circuit protection, dependable conductor termination and convenient test access within industrial DIN rail assemblies.
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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...