TE Connectivity ZS4-D2-SF1 1SNK508425R0000 is a grey and dark grey double-deck ENTRELEC SNK screw clamp terminal block combining feed-through and fused circuits with four positions, an 8 mm pitch and support for 5 × 20 mm and 5 × 25 mm cartridge fuses.
£5.41
The TE Connectivity ZS4-D2-SF1 1SNK508425R0000 is a compact double-deck fused screw clamp terminal block designed for industrial control, automation, instrumentation and power distribution applications. Part of the TE Connectivity ENTRELEC SNK Series, it combines feed-through and fuse functions within one space-saving DIN rail terminal block.
The ZS4-D2-SF1 provides two independent circuits across two levels with four connection positions. Its 8 mm pitch allows panel builders to increase wiring density while maintaining clear separation between circuit functions, making it particularly useful in control cabinets where space efficiency and fused protection are important.
Designed around a nominal 4 mm² terminal size, the ZS4-D2-SF1 accepts conductors up to 6 mm² and supports 5 × 20 mm and 5 × 25 mm fuses. The terminal is rated at 6.3 A and 800 V under IEC specifications, providing dependable circuit protection and connectivity for demanding industrial installations.
Double-deck fuse terminal blocks allow panel builders to combine multiple circuit functions within a smaller DIN rail footprint. The TE Connectivity ZS4-D2-SF1 incorporates separate feed-through and fused functions across two levels, helping improve wiring density while retaining straightforward circuit identification and maintenance access.
The integrated fuse holder accepts standard 5 × 20 mm and 5 × 25 mm cartridge fuses, allowing individual circuits to be protected without requiring separate external fuse holders. Together with dependable screw clamp connections and the compact 8 mm width, this makes the ZS4-D2-SF1 well suited to industrial control, instrumentation and I/O wiring.
| Manufacturer | TE Connectivity |
|---|---|
| Series | ENTRELEC SNK |
| Model | ZS4-D2-SF1 |
| Part number | 1SNK508425R0000 |
| Product type | Screw clamp terminal block |
| Terminal type | Fused / feed-through |
| Connection type | Screw connection |
| Block function | Feed-through & fuse |
| Number of circuits | 2 |
| Number of levels | 2 |
| Number of positions | 4 |
| Gauge type | A3-B3 |
| Colour | Grey & dark grey |
| Nominal terminal size | 4 mm² |
| Product spacing | 8 mm |
| Rated current (IEC) | 6.3 A |
| Rated voltage (IEC) | 800 V |
| Rated current (UL) | 12 A |
| Rated current (CSA) | 12 A |
| Operating voltage (UL/CSA) | 300 V |
| Impulse withstand voltage (IEC) | 8,000 V |
| Dielectric withstand voltage | 2,000 V |
| Short-time withstand current at 1 s | 480 A |
| Fuse size | 5 × 20 mm / 5 × 25 mm |
| Rigid stranded conductor capacity | 0.2–6 mm² |
| Flexible conductor capacity | 0.22–4 mm² |
| Insulated ferrule capacity | 0.22–4 mm² |
| Non-insulated ferrule capacity | 0.22–4 mm² |
| Wire size | 24–10 AWG |
| Wire stripping length | 11 mm |
| Housing material | Polyamide |
| Flammability rating | UL 94V-0 |
| Mounting type | DIN rail |
| DIN rail compatibility | TH35-7.5 / TH35-15 |
| Product height | 89.2 mm |
| Product depth | 66.5 mm |
| Product width | 8 mm |
| Product weight | 27.5 g |
It is a double-deck fused screw clamp terminal block used to combine feed-through wiring and fuse-protected circuits in industrial control, instrumentation and automation panels.
The terminal block is designed for standard 5 × 20 mm and 5 × 25 mm cartridge fuses.
The ZS4-D2-SF1 provides two independent circuits across two levels with a total of four connection positions.
The terminal block is rated at 6.3 A and 800 V under IEC specifications, with an impulse withstand voltage of 8,000 V.
It accepts rigid stranded conductors from 0.2–6 mm² and flexible conductors from 0.22–4 mm², covering wire sizes from 24–10 AWG.
TE Connectivity ENTRELEC SNK terminal blocks provide dependable and space-efficient electrical connectivity for industrial automation, control and distribution systems, with double-deck fused designs helping engineers integrate circuit protection into compact DIN rail assemblies.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...