CDL4UED1 Double Level Terminal Block with Diode Circuit (D1 Configuration) is used in industrial electrical and control circuits where wire connection with built-in diode protection and signal isolation functionality is required. It is specially designed for applications such as relay circuits, PLC output protection, reverse polarity protection, signal isolation circuits, lamp testing circuits, and control signal protection systems. The inbuilt diode circuit allows one-way current flow and blocks reverse current, helping protect sensitive electrical components and improving control circuit reliability in industrial automation systems.
CDL4UED1 works as a double level screw clamp terminal block with inbuilt D1 diode circuit configuration. It provides 4 connection points in a compact double-level body while integrating an internal 1N4007 diode-based protection circuit inside the terminal block. The diode allows current flow in one direction and blocks reverse voltage, helping protect PLC outputs, relay coils, and sensitive control circuits from reverse polarity damage. This reduces the need for separate external diode assemblies and simplifies panel wiring.
CDL4UED1 improves circuit safety by integrating the diode protection circuit directly inside the terminal block, helping prevent reverse voltage damage in sensitive control circuits. This improves wiring reliability, reduces wrong external diode installation risk, and makes troubleshooting easier in industrial control panels. Its structured double-level design also improves maintenance visibility and safer wiring access.
CDL4UED1 is manufactured using high-quality Polyamide insulated housing that provides strong mechanical durability, flame resistance, and excellent electrical insulation performance. Its M3 screw clamp system ensures secure conductor holding and low contact resistance, while the integrated diode circuit is safely enclosed inside the terminal body for reliable long-term industrial performance.
Using CDL4UED1 improves panel wiring by combining wire connection + diode protection + circuit function integration in one compact terminal block. This reduces separate external diode wiring, saves panel space, improves installation speed, and creates a cleaner and more professional control panel layout in industrial automation systems.
| Specification | Details |
|---|---|
| Model Number | CDL4UED1 |
| Product Type | Double Level Terminal Block with Electronic Component |
| Configuration | D1 Diode Circuit |
| Connection Type | Screw Clamp |
| Product Function | With Electronic Components – Diode |
| Number of Levels | 2 Level |
| Number of Connections | 4 |
| Rated Voltage (IEC) | 500 V |
| Rated Current (IEC) | 32 A |
| Rated Voltage (UL) | 600 V |
| Rated Current (UL) | 35 A |
| Rated Voltage (CSA) | 300 V |
| Rated Current (CSA) | 25 A |
| Conductor Size Solid | 0.2 – 6 mm² |
| Conductor Size Stranded | 0.2 – 4 mm² |
| Ferrule Capacity | 0.2 – 4 mm² |
| Twin Ferrule Capacity | 0.2 – 2.5 mm² |
| AWG Range | 22 – 10 AWG |
| Wire Stripping Length | 9 mm |
| Tightening Torque | 0.5 Nm |
| Screw Size | M3 |
| Wire Entry Orientation | Side Entry |
| Housing Material | Polyamide |
| Width (Thickness) | 6 mm |
| Length | 55.5 mm |
| Height (DIN 32 Rail) | 60.3 mm |
| Height (DIN 35 x 15 Rail) | 63.1 mm |
| Height (DIN 35 x 7.5 Rail) | 55.7 mm |
| Mounting Type | DIN 32 / DIN 35 / DIN 35-15 Rail |
| Operation Type | Screwdriver Operated |
| Diode Type | 1N4007 |
| Diode Reverse Voltage | 1000 V |
| Diode Forward Current | 1 A |
| Colour | Grey |
CDL4UED1 is widely used in:
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