Why Choose the TE Connectivity ZK2.5-SF PI-Spring Fuse Terminal Block?
The TE Connectivity ZK2.5-SF is a compact PI-Spring fuse terminal block designed to combine conductor termination and circuit protection within a single DIN rail component. Part of the TE Connectivity ENTRELEC SNK series, this grey and dark grey terminal accepts standard 5 × 20 mm fuses and is designed for industrial power and signal circuits.
Its integrated fuse holder allows a protective fuse to be incorporated directly into the terminal row, helping simplify circuit protection, troubleshooting and maintenance. The terminal is compliant with IEC 60947-7-3, while two jumper channels aligned with compatible ZK4-3P feed-through and ZK2.5-S-R1 disconnect terminals support efficient distribution within modular SNK assemblies.
With a rated cross-section of 2.5 mm², 6 mm spacing and an IEC rating of 6.3 A at 500 V, the ZK2.5-SF provides compact fused circuit protection for control and automation applications. Its PI-Spring connections accept rigid stranded conductors up to 4 mm² / 12 AWG, and the fuse is replaceable without disturbing the field wiring.
Key Advantages
- Combines terminal connection and 5 × 20 mm fuse protection in one compact component.
- PI-Spring connection technology provides fast, secure and consistent conductor termination.
- Compact 6 mm terminal spacing helps conserve DIN rail space.
- 6.3 A and 500 V IEC ratings for protected industrial power and signal circuits.
- Accepts rigid stranded conductors up to 4 mm² / 12 AWG.
- Two jumper channels simplify potential distribution across compatible SNK terminals.
- Profile alignment with ZK4-3P and ZK2.5-S-R1 supports organised terminal assemblies.
- Compliant with IEC 60947-7-3 requirements for fuse terminal blocks.
Key Features
- TE Connectivity ENTRELEC SNK series.
- PI-Spring fuse terminal block.
- Designed for 5 × 20 mm cartridge fuses.
- Fuse not supplied with the terminal block.
- Two-position, single-level configuration.
- One protected electrical circuit.
- 6 mm product spacing.
- 6.3 A rated current to IEC.
- 500 V rated voltage to IEC.
- 16 A current rating to UL and CSA.
- 300 V maximum operating voltage to UL and CSA.
- 6000 V IEC impulse withstand voltage.
- Grey and dark grey polyamide insulating housing.
- UL 94 V-0 flammability rating.
- IP20 protection.
- Suitable for TH35-7.5 and TH35-15 DIN rails.
Integrated Circuit Protection with PI-Spring Connections
Fuse terminal blocks provide a convenient way to incorporate replaceable overcurrent protection directly into a DIN rail terminal assembly. The ZK2.5-SF accommodates a standard 5 × 20 mm cartridge fuse, allowing individual circuits to be protected while retaining convenient access for inspection and fuse replacement. The fuse itself is not supplied with the terminal block.
The ENTRELEC SNK design incorporates two jumper channels aligned with ZK4-3P feed-through and ZK2.5-S-R1 disconnect terminal blocks, simplifying potential distribution across mixed terminal rows. Combined with PI-Spring conductor termination and a compact 6 mm footprint, this makes the ZK2.5-SF particularly suitable for control, automation and marshalling applications requiring organised fused protection.
Typical Applications
- Industrial control panels and electrical cabinets.
- PLC and distributed I/O circuit protection.
- Instrumentation and sensor circuits.
- Machine building and OEM automation equipment.
- Marshalling cabinets and junction panels.
- Process control and signalling systems.
- DIN rail circuits requiring replaceable 5 × 20 mm fuse protection.
