CYK4BU is a knife disconnect & test terminal block in blue color specially designed for industrial electrical systems where safe circuit isolation, testing access, neutral circuit interruption, and maintenance-friendly panel wiring are required. In electrical control panels, PLC cabinets, switchboards, instrumentation systems, process control panels, and industrial automation systems, technicians often need to isolate specific circuits during maintenance, troubleshooting, testing, or commissioning without disturbing the entire electrical installation.
Using standard feed-through terminals in such applications does not allow safe circuit interruption or easy testing access. The CYK4BU solves this challenge by integrating a knife disconnect mechanism inside the terminal block, allowing the electrical circuit to be safely opened or isolated whenever required. This makes testing, fault tracing, and maintenance much faster and safer.
The blue housing provides a strong visual identification advantage and is commonly used for neutral circuit wiring, dedicated testing sections, and organized panel circuit grouping, helping technicians identify specific terminal sections quickly during servicing.
This terminal block is ideal for industrial applications where safe circuit disconnection, test access, and organized DIN rail panel wiring are critical.
The CYK4BU operates as a knife disconnect feed through terminal block, where conductors are connected through a standard screw clamp connection while a built-in knife disconnect link allows the circuit to be manually opened or closed.
Its working design provides:
During servicing or troubleshooting, the knife disconnect can be opened to isolate the circuit without removing conductors, improving safety and reducing maintenance time. Test sockets also provide convenient electrical measurement access.
The blue housing color improves visual recognition of dedicated terminal sections inside electrical panels.
Safety advantages include:
The knife disconnect feature allows safe maintenance and electrical testing without disturbing surrounding circuits.
Blue terminal blocks are commonly used for:
This improves organized electrical panel management.
The CYK4BU is manufactured using industrial-grade polyamide insulated housing with precision conductive knife disconnect hardware, designed for demanding industrial electrical applications.
Construction advantages include:
Its rugged construction ensures dependable electrical isolation and testing performance in industrial control panels.
Using CYK4BU improves electrical panel layout by combining feed through wiring, circuit isolation, and testing access in one compact terminal block.
Benefits include:
| Parameter | Specification |
|---|---|
| Product Code | CYK4BU |
| Product Type | Knife Disconnect & Test Terminal Block |
| Color | Blue |
| Connection Type | Screw Clamp |
| Rated Voltage | 1000 V |
| Rated Current | 28 A |
| Conductor Capacity | Up to 4 mm² |
| AWG Range | 24 – 10 AWG |
| Disconnect Mechanism | Knife Disconnect |
| Testing Facility | Integrated Test Access |
| Screw Size | M3 |
| Tightening Torque | 0.5 Nm |
| Mounting Style | DIN Rail |
| Housing Material | Polyamide |
| Rated Surge Voltage | 8 kV |
| Pollution Degree | 3 |
| Length | 58.8 mm |
| Height | 56.6 mm |
| Thickness | 6 mm |
| Electrical Function | Circuit Isolation & Testing |
| Industrial Use | PLC Panels, Automation Systems, Switchboards |
Built-in knife disconnect allows safe maintenance.
Integrated test facility improves troubleshooting.
Blue housing supports visual identification.
Screw clamp design provides reliable conductor holding.
Saves valuable panel wiring space.
Built for demanding electrical environments.
Supports safe and structured wiring layouts.
CYK4BU is widely used in:
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