Why Choose the TE Connectivity ZK2.5-SF-R1 PI-Spring Fuse Terminal Block?
The TE Connectivity ZK2.5-SF-R1, part number 1SNK706411R0000, is a compact PI-Spring fuse terminal block with blown-fuse indication designed to combine conductor termination and circuit protection within industrial control panels and automation systems. Part of the TE Connectivity ENTRELEC SNK Series, it accommodates standard 5 × 20 mm fuses and provides convenient DIN rail mounting for organised electrical installations.
The ZK2.5-SF-R1 incorporates a 24–110 V AC/DC blown-fuse indicator, allowing maintenance personnel to identify a failed fuse quickly and simplify fault finding. The fuse is replaceable and is not supplied with the terminal block, allowing the appropriate 5 × 20 mm fuse to be selected for the protected circuit.
With an IEC voltage rating of 500 V and an IEC current rating of 6.3 A, the ZK2.5-SF-R1 is suitable for protected power and signal circuits. Its 6 mm spacing, spring connection system and support for flexible conductors up to 2.5 mm² provide a compact and practical solution for machinery, control cabinets and industrial distribution applications.
Key Advantages
- Combines fuse protection and PI-Spring conductor termination in one DIN rail terminal.
- Integrated 24–110 V AC/DC blown-fuse indicator assists rapid fault identification.
- Designed for standard 5 × 20 mm fuses.
- 500 V IEC voltage rating for industrial power and signal circuits.
- 6.3 A IEC current rating suitable for fused circuit protection.
- Compact 6 mm spacing helps conserve DIN rail space.
- PI-Spring technology provides fast and reliable spring-clamp wiring.
Key Features
- TE Connectivity ENTRELEC SNK Series.
- PI-Spring fuse terminal block.
- 24–110 V AC/DC blown-fuse indicator.
- Suitable for 5 × 20 mm fuse cartridges.
- 2-position terminal configuration.
- 500 V IEC rated voltage.
- 6.3 A IEC rated current.
- 6 kV IEC impulse withstand voltage.
- 6 mm product spacing.
- Flexible conductor capacity from 0.22–2.5 mm².
- Rigid stranded conductor capacity from 0.2–4 mm².
- Compatible with TH35-7.5 and TH35-15 DIN rails.
- Grey and dark grey polyamide housing.
- IP20 protection rating.
Integrated Fuse Protection with Fast PI-Spring Wiring
Fuse terminal blocks combine terminal connection and replaceable overcurrent protection within a compact DIN rail component. The ZK2.5-SF-R1 accepts a standard 5 × 20 mm fuse and incorporates a blown-fuse indicator, allowing a defective circuit to be identified quickly during inspection and maintenance.
The ENTRELEC PI-Spring connection system provides consistent spring contact pressure and efficient conductor termination without conventional screw tightening. Combined with the integrated fuse holder and indicator, this makes the ZK2.5-SF-R1 particularly suitable for protected control, instrumentation and automation circuits where compact installation and straightforward maintenance are important.
Typical Applications
- Fused circuits in industrial control panels.
- PLC and automation control systems.
- Instrumentation and signal circuits.
- Machine building and OEM equipment.
- Power distribution and control cabinets.
- Motor control and auxiliary circuits.
- DIN rail electrical assemblies requiring blown-fuse indication.
