The CYF4 is a 4 sq.mm fuse terminal block designed for industrial electrical circuits where both wire termination and fuse protection are required in a single compact terminal block. It is widely used in control panels, PLC cabinets, instrumentation systems, machine wiring, switchgear assemblies, and automation panels where circuit protection is essential for sensitive electrical components and control wiring.
Unlike standard feed-through terminal blocks, the CYF4 includes an integrated fuse holder mechanism, allowing a protective fuse to be installed directly inside the terminal block body. This design protects connected circuits against overloads, short circuits, and fault currents while also reducing the need for separate inline fuse holders. This makes panel wiring cleaner, safer, and more compact in industrial electrical systems.
One of the biggest advantages of the CYF4 is its compatibility with 5 x 20 mm and 5 x 25 mm cartridge fuses, which are widely used in industrial control and signal protection applications. When excessive current flows through the circuit, the fuse interrupts the electrical path and protects sensitive components such as relays, PLC inputs, sensors, instrumentation devices, and control circuits from damage.
The screw clamp connection system provides secure conductor retention and reliable electrical continuity. This technology ensures strong wire clamping, low contact resistance, and long-term performance in industrial environments where vibration, temperature fluctuations, and continuous operation can affect wiring stability. The terminal block supports conductor sizes up to 4 sq.mm, making it suitable for control circuits, signal circuits, and protected power wiring applications.
The single-level compact design allows easy installation on DIN 35 rail systems, helping panel builders save space while maintaining neat wiring layouts. The enclosed fuse terminal construction improves safety by reducing accidental contact risk and eliminates the need for separate end plates in many installations. This improves maintenance convenience and makes fuse replacement easier during servicing.
Manufactured using high-grade polyamide insulated housing, the CYF4 provides excellent dielectric strength, heat resistance, and mechanical durability. The rugged construction ensures reliable operation in industrial electrical environments where safe fuse protection and secure conductor connection are critical.
The terminal block is rated for 1000V voltage and 10A current capacity, making it suitable for industrial control circuits, instrumentation protection, signal wiring, and electrical panel fuse protection applications. Its compact 6 mm width allows high-density panel mounting in modern automation systems and machine control cabinets.
The CYF4 is commonly used in:
With its integrated fuse holder, screw clamp connection, compact DIN rail design, and reliable circuit protection capability, the CYF4 is an ideal solution for industrial electrical systems requiring both wiring termination and fuse-based protection in one terminal block.
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