What Is a Through-Wall Pluggable Terminal Block?
A 3.81mm Through-Wall Terminal Block is a two-piece connector system designed to pass power and signals through an enclosure wall or control panel. The female plug connects to field wiring, while the male pin header mounts securely to the panel cutout. When mated, they form a sealed, vibration-proof electrical interface.
Unlike standard PCB-mount terminal blocks, the through-wall design allows wiring to be routed from outside the enclosure to internal electronics without compromising the panel’s integrity. This makes it a preferred choice for industrial automation cabinets, power distribution modules, and heavy machinery control systems.
Introducing the 15EDGWB Series 3.81mm Through-Wall Terminal Block
LYD‘s 3.81mm Through-Wall Terminal Block is a 3.81mm pitch through-wall pluggable terminal block engineered for high-reliability industrial electronics and heavy-duty wire harness applications. The system combines a secure screw-clamping female plug with a robust male header featuring integrated mounting flanges.
3.81mm Through-Wall Terminal Block Key Features
- Reliable Cage Clamp Mechanism: Premium square cage clamp with M2 copper zinc-plated screws ensures maximum retention force and excellent electrical conductivity without damaging wires.
- Secure Panel Mounting: Robust side mounting ears and threaded brass inserts allow stable panel cutout integration that withstands frequent plugging cycles.
- Excellent Material Integrity: Molded from flame-retardant PA66 (UL94 V-0) thermoplastic housing, paired with nickel-plated phosphor bronze contacts and tin-plated copper headers.
- Flexible Configurations: Available from 2 to 24 poles to match various wiring harness architectures and space-constrained industrial layouts.
3.81mm Through-Wall Terminal Block Technical Specifications
| Parameter | Specification |
|---|---|
| Pitch | 3.81 mm |
| Number of Poles | 2P to 24P |
| Rated Voltage | 300V (UL) / 320V (IEC) |
| Rated Current | 8A (UL) / 7A (IEC) |
| Dielectric Withstanding Voltage | AC 2000V / 1 Minute |
| Wire Range | 28 – 16 AWG (0.1 – 2.5 mm²) |
| Screw Torque | Max 0.2 Nm (Plug) / 0.4 Nm (Panel) |
| Stripping Length | 7 – 8 mm |
| Operating Temperature | -40°C to +105°C |
Material Specifications
| Component | Material |
|---|---|
| Housing | PA66, UL94 V-0 (Green standard, custom colors available) |
| Screw | M2, Copper, Zinc-plated |
| Contact / Pin Header | Phosphor Bronze, Nickel-plated or Copper, Tin-plated |
| Cage Clamp | Brass, Nickel-plated or Steel, Zinc-plated |
Why Choose a Through-Wall Design?
Standard terminal blocks that mount directly to a PCB can place stress on solder joints when cables are pulled or vibrated. A through-wall panel-mount terminal block solves this by transferring mechanical strain to the enclosure wall rather than the PCB. This is critical in applications such as:
- PLC and industrial controller I/O panels — frequent cable connection/disconnection cycles
- Variable frequency drive (VFD) cabinets — high-vibration environments
- Power supply enclosures — high-current cables requiring secure anchoring
- Instrumentation and measurement equipment — signal integrity in sensitive circuits
Female Plug vs Male Panel Socket: Which Configuration Do You Need?
The 15EDGWB series offers two mating configurations:
- Female Plug: The field-wiring side with cage clamp terminals. Wires are stripped, inserted, and secured with M2 screws. This plug connects to the male header mounted on the panel.
- Male Panel Socket (Header): The fixed side with pin contacts and integral mounting flanges. Bolts through the panel cutout using the provided mounting holes (diameter 2.30 mm).
This modular approach means you can pre-wire multiple female plugs offline and simply plug them into the panel-mounted headers during assembly — saving significant labor time in production.
How to Wire the Cage Clamp Terminal
- Strip the wire insulation to 7-8 mm.
- Loosen the M2 screw using a screwdriver (max torque 0.2 Nm).
- Insert the stripped wire into the square cage clamp opening.
- Tighten the screw to clamp the wire securely.
- Gently pull the wire to verify retention.
No crimping or soldering is required — the cage clamp provides a gas-tight connection that resists vibration and thermal cycling.
Standards and Compliance
- UL94 V-0 — Housing flame retardancy
- UL / IEC — Electrical safety ratings
- RoHS — Restriction of hazardous substances
Customization Options
| Option | Available |
|---|---|
| Pole Count | 2 to 24 positions (any custom count) |
| Housing Color | Green (standard), Blue, Black, Gray |
| Contact Plating | Tin or Nickel |
| Packaging | Bulk, tube, or tape-and-reel |
Why Choose LYD?
- 17+ years of connector and terminal block manufacturing experience
- UL / RoHS / REACH compliant production lines
- Low MOQ for standard models — suitable for prototyping through mass production
- Fast lead times — stock items ship within 5-7 business days
- Engineering support — technical drawings (PDF/DWG) available on request
Browse the 3.81mm Through-Wall Terminal Block u2192
Need help selecting the right terminal block for your control panel? Contact our team: nick.xu@lyd123.com
