1sna399770r2700 – d4/8,sfdt2,i,ado2

Why Choose the TE Connectivity D4/8.SFDT2.I.ADO2 Fuse Terminal Block?

The TE Connectivity / ENTRELEC D4/8.SFDT2.I.ADO2, manufacturer part number 1SNA399770R2700, is a compact fuse DIN rail terminal block with ADO and screw-clamp connections designed to provide circuit protection, convenient testing and reliable conductor termination in industrial control panels and automation systems. Part of the established ENTRELEC SNA ADO range, it accepts standard 5 × 20 mm and 5 × 25 mm fuses and incorporates a blown-fuse indicator for rapid fault identification.

The D4/8.SFDT2.I.ADO2 combines the advantages of the ADO System insulation displacement connection with a conventional screw-clamp connection, providing installers with flexible wiring options. The ADO side supports up to two wires per connection, while the integrated fuse carrier allows individual circuits to be protected and isolated within the terminal strip.

With a rated current of 6.3 A, rated voltage of 500 V and rated cross-section of 2.5 mm², the 1SNA399770R2700 is suitable for protected control and instrumentation circuits. This version features a 24 V AC/DC LED blown-fuse indicator and two 2 mm test sockets, helping engineers quickly identify failed fuses and access circuits during commissioning, diagnostics and maintenance.

Key Advantages

• Integrated fuse holder for 5 × 20 mm and 5 × 25 mm fuses.
• 24 V AC/DC LED blown-fuse indicator enables rapid identification of defective circuits.
• Includes two 2 mm test sockets for convenient electrical testing.
• Combines ADO System and screw-clamp connection technologies.
• 6.3 A rated current and 500 V rated voltage.
• ADO connection supports up to two conductors per connection.
• Compact 8 mm width helps conserve DIN rail space.
• DIN rail mounting provides straightforward integration into industrial control cabinets.

Key Features

• TE Connectivity / ENTRELEC D4/8.SFDT2.I.ADO2 fuse terminal block.
• Suitable for 5 × 20 mm and 5 × 25 mm fuses.
• 24 V AC/DC LED blown-fuse indication.
• Two 2 mm-diameter test sockets.
• 6.3 A rated current.
• 500 V rated voltage.
• 6,000 V rated impulse withstand voltage.
• 300 A short-time withstand current for 1 s.
• 2.5 mm² rated cross-section.
• Hybrid screw-clamp and ADO System connection.
• ADO conductor capacity of 1–2.5 mm².
• Screw-clamp conductor capacity up to 4 mm².
• IP20 protection at the main terminals.
• Grey polyamide housing with UL 94 V-0 flammability classification.
• Compatible with TH 35-7.5 and TH 35-15 DIN rail.

Circuit Protection and Testing for Industrial Control Panels

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.SFDT2.I.ADO2 accepts standard 5 × 20 mm and 5 × 25 mm fuses, allowing individual control and instrumentation circuits to be protected without requiring separate panel-mounted fuse holders.

The integrated 24 V AC/DC LED provides visual indication when a fuse has blown, helping maintenance engineers locate defective circuits quickly. Two 2 mm test sockets provide convenient access for measurement and diagnostics, while the combination of ADO and screw-clamp termination gives installers flexibility when connecting field and panel wiring.

Typical Applications

• Fused industrial control circuits.
• PLC input and output protection.
• Industrial automation and control panels.
• Instrumentation and process control circuits.
• Machine building and OEM electrical systems.
• Factory automation and production equipment.
• Low-current auxiliary and signalling circuits.
• Circuits requiring visual blown-fuse indication and convenient test access.