The CYF4BU is a 4 sq.mm fuse terminal block in blue colour, specially designed for industrial electrical systems where wire termination, fuse protection, and neutral circuit identification are required in a single compact terminal block. This model is widely used in control panels, PLC cabinets, machine wiring, instrumentation systems, switchgear assemblies, and automation panels where safe circuit protection and organized wiring are essential. The blue colour (BU variant) makes it particularly suitable for neutral circuits, DC negative wiring, and colour-coded industrial electrical systems.
One of the major advantages of the CYF4BU is its integrated fuse holder design, which combines conductor connection and fuse-based circuit protection in one compact terminal block. Instead of using separate inline fuse holders, this terminal block allows a cartridge fuse to be installed directly inside the terminal body, helping protect connected circuits against short circuits, overload conditions, and fault currents. This reduces panel clutter and creates a cleaner, more organized wiring layout in industrial control cabinets.
The blue colour version is commonly used for neutral distribution circuits, return circuits, DC negative wiring, and identified protected signal circuits in industrial control panels. Colour-coded terminal blocks improve maintenance efficiency by helping technicians quickly identify circuit functions during installation, servicing, and troubleshooting. In complex electrical panels, this reduces wiring mistakes and improves operational safety.
The CYF4BU is compatible with 5 x 20 mm and 5 x 25 mm glass cartridge fuses, which are commonly used in industrial control and signal protection applications. When excessive current passes through the circuit, the fuse interrupts the electrical path, protecting connected equipment such as PLC inputs, relays, sensors, instrumentation devices, and control circuits from damage. This makes the terminal block highly suitable for sensitive industrial electrical systems.
The terminal block uses a screw clamp wire connection system, which provides secure conductor retention and dependable electrical continuity. Screw clamp terminals are widely preferred in industrial applications because they offer strong mechanical grip, low contact resistance, and stable long-term performance even in environments affected by vibration, heat, and continuous operation. The CYF4BU supports conductor sizes up to 4 sq.mm, making it suitable for control wiring, signal circuits, and protected industrial electrical connections.
Its single-level compact design allows installation on DIN 35 rail systems, making it suitable for modular industrial electrical cabinets. The enclosed fuse terminal construction improves safety by reducing accidental contact risk and eliminates the need for separate end plates in many panel applications. Fuse replacement is simple, making maintenance easier and reducing downtime during servicing.
Manufactured using high-grade polyamide insulated housing, the CYF4BU offers excellent dielectric insulation, heat resistance, and mechanical durability for long-term industrial use. The rugged construction ensures reliable electrical performance under industrial operating conditions while protecting technicians from accidental electrical contact.
The terminal block is rated for 1000V operating voltage and 10A current capacity, making it suitable for industrial control circuits, signal wiring, instrumentation protection, and neutral circuit fuse protection applications. Its 6 mm compact width allows high-density mounting in modern automation systems and machine control cabinets.
The CYF4BU is commonly used in:
With its blue circuit identification colour, integrated fuse holder, secure screw clamp connection, and compact DIN rail design, the CYF4BU is a practical and reliable terminal block solution for industrial electrical systems requiring both conductor termination and fuse-based protection.
| Specification | Details |
|---|---|
| Product Model | CYF4BU |
| Product Type | Fuse Terminal Block |
| Colour | Blue |
| Fuse Size Compatibility | 5 x 20 mm / 5 x 25 mm |
| Connection Type | Screw Clamp |
| Number of Positions | 2 |
| Rated Voltage | 1000 V |
| Rated Current | 10 A |
| Wire Size | 0.2 – 4 mm² |
| AWG Range | 24 – 10 AWG |
| Terminal Width | 6 mm |
| Mounting Type | DIN 35 / DIN 35-15 Rail |
| Housing Material | Polyamide |
| Wire Entry | Side Entry |
| Screw Size | M3 |
| Tightening Torque | 0.5 Nm |
| Rated Surge Voltage | 6 KV |
| Pollution Degree | 3 |
The CYF4BU is suitable for:
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