Why Choose the TE Connectivity ZK2.5-SF-R3 PI-Spring Fuse Terminal Block?
The TE Connectivity ZK2.5-SF-R3, part number 1SNK706412R0000, is a compact PI-Spring fuse terminal block with blown-fuse indication designed to combine conductor termination and circuit protection within industrial control panels, machinery and automation systems. Part of the TE Connectivity ENTRELEC SNK Series, it accommodates standard 5 × 20 mm fuses and provides a convenient DIN rail solution for protected power and signal circuits.
The ZK2.5-SF-R3 incorporates a 115–250 V AC/DC blown-fuse indicator, helping maintenance personnel identify a defective circuit quickly. The indicator has a leakage current of less than 0.5 mA, while the replaceable 5 × 20 mm fuse arrangement allows the required fuse to be selected for the application. The fuse itself is not supplied with the terminal block.
With an IEC voltage rating of 500 V, an IEC current rating of 6.3 A and a compact 6 mm spacing, the ZK2.5-SF-R3 provides efficient fused circuit protection without consuming excessive DIN rail space. Its PI-Spring connection technology supports fast, secure wiring and accepts flexible conductors up to 2.5 mm² and rigid stranded conductors up to 4 mm².
Key Advantages
- Combines fuse protection and PI-Spring conductor termination in one DIN rail terminal.
- Integrated 115–250 V AC/DC blown-fuse indicator assists rapid fault identification.
- Designed for standard 5 × 20 mm fuse cartridges.
- 500 V IEC voltage rating for industrial power and signal circuits.
- 6.3 A IEC current rating for fused circuit applications.
- Compact 6 mm spacing helps conserve DIN rail space.
- Two jumper channels support efficient potential distribution within compatible SNK assemblies.
Key Features
- TE Connectivity ENTRELEC SNK Series.
- PI-Spring fuse terminal block.
- 115–250 V AC/DC blown-fuse indicator.
- Indicator leakage current below 0.5 mA.
- Suitable for 5 × 20 mm fuses.
- 2-position, single-circuit, single-level 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 conductor connection and replaceable overcurrent protection within a compact modular component. The ZK2.5-SF-R3 accepts a standard 5 × 20 mm fuse and includes a blown-fuse indicator for 115–250 V AC/DC circuits, helping technicians locate a failed fuse rapidly during inspection and maintenance.
The ENTRELEC PI-Spring connection system provides dependable spring contact pressure and efficient conductor termination without conventional screw tightening. Two jumper channels are aligned with compatible SNK terminal blocks to simplify potential distribution, making the ZK2.5-SF-R3 particularly useful in organised industrial control and automation assemblies.
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 circuits requiring blown-fuse indication.
