TE Connectivity ZS4-SF1-R4 1SNK508415R0000 is an ENTRELEC SNK 4 mm² screw clamp fuse terminal block for 5 × 20 mm and 5 × 25 mm fuses with a 115–250 V AC/DC blown-fuse indicator, two test sockets and IEC ratings of 6.3 A and 630 V.
£11.44
The TE Connectivity ZS4-SF1-R4 is a compact 4 mm² screw clamp fuse terminal block with blown-fuse indication designed for protected power and signal circuits in industrial control panels, machinery and automation systems. Part of the TE Connectivity ENTRELEC SNK terminal block series, it combines replaceable fuse protection, visual fault indication and convenient testing within a space-efficient DIN rail format.
Designed for 5 × 20 mm and 5 × 25 mm fuses, the ZS4-SF1-R4 incorporates a blown-fuse indicator operating at 115–250 V AC/DC. This enables maintenance personnel to identify defective circuits quickly, while two integrated 2 mm test sockets provide convenient access for electrical testing and troubleshooting without disturbing the connected wiring.
With a 4 mm² conductor capacity, 6.3 A IEC current rating and 630 V IEC voltage rating, the ZS4-SF1-R4 is well suited to protected control, signalling and auxiliary circuits. Its 8 mm terminal spacing, grey and dark-grey polyamide housing and standard DIN rail mounting make it a practical solution for professional industrial panel construction.
Fused terminal blocks combine conductor termination and replaceable overcurrent protection within a single DIN rail component. The ZS4-SF1-R4 adds a 115–250 V AC/DC blown-fuse indicator, allowing maintenance personnel to locate failed fuse circuits quickly and helping reduce troubleshooting time in industrial electrical installations.
Two built-in test sockets further simplify diagnostic work by providing convenient measurement access. Together with the modular ENTRELEC SNK architecture and secure screw clamp connections, these features make the ZS4-SF1-R4 particularly suitable for control panels where circuit protection, serviceability and efficient use of DIN rail space are important.
| Manufacturer | TE Connectivity |
|---|---|
| Brand / range | ENTRELEC |
| Series | SNK |
| Model | ZS4-SF1-R4 |
| Manufacturer part number | 1SNK508415R0000 |
| Product type | Screw clamp fuse terminal block with blown-fuse indicator |
| Block function | Fuse |
| Fuse compatibility | 5 × 20 mm / 5 × 25 mm |
| Fuse supplied | No |
| Blown-fuse indicator voltage | 115–250 V AC/DC |
| Indicator leakage current | <0.5 mA |
| Test sockets | 2 × 2 mm diameter |
| Number of circuits | 1 |
| Number of levels | 1 |
| Number of positions | 2 |
| Conductor capacity | 0.2–4 mm² |
| Flexible conductor capacity | 0.22–4 mm² / 24–10 AWG |
| Rigid stranded conductor capacity | 0.2–4 mm² / 24–10 AWG |
| Insulated ferrule capacity | 0.22–4 mm² / 24–12 AWG |
| Twin ferrule capacity | 0.22–2.5 mm² / 24–14 AWG |
| Product spacing | 8 mm |
| Rated current (IEC) | 6.3 A |
| Rated current (UL) | 10 A |
| Rated current (CSA) | 6.3 A |
| Rated voltage (IEC) | 630 V |
| Rated voltage (CSA) | 300 V |
| Operating voltage (UL / CSA) | 300 V |
| Impulse withstand voltage (IEC) | 8000 V |
| Dielectric withstand voltage | 2200 V |
| Wire stripping length | 11 mm |
| Connection type | Screw clamp |
| Housing material | Polyamide |
| Flammability rating | UL 94 V-0 |
| Colour | Grey / dark grey |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Operating temperature | -55 to +110 °C |
| Installation temperature | -5 to +40 °C |
| Product height | 59.7 mm |
| Product length | 45.6 mm |
| Weight | 13.3 g |
| Pack quantity | 50 |
The ZS4-SF1-R4 combines screw clamp conductor termination, replaceable fuse protection and blown-fuse indication for industrial control, signalling, instrumentation and auxiliary circuits.
The terminal block is designed for 5 × 20 mm and 5 × 25 mm cartridge fuses. The fuse is not supplied with the terminal block.
The ZS4-SF1-R4 incorporates a blown-fuse indicator designed for 115–250 V AC/DC, with leakage current below 0.5 mA.
Yes. It incorporates two 2 mm test sockets to provide convenient access for electrical measurements and circuit troubleshooting.
The ZS4-SF1-R4 has an IEC current rating of 6.3 A and an IEC voltage rating of 630 V, with an impulse withstand voltage rating of 8000 V.
TE Connectivity ENTRELEC SNK fused terminal blocks provide panel builders, automation engineers and machine manufacturers with compact circuit protection, dependable screw clamp connectivity and convenient fault identification for professional industrial electrical systems.
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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...