Weidmüller BL-I/O 3.50/30LR NPN LED SN BK BX Connector Guide

The Weidmüller BL-I/O 3.50/30LR NPN LED SN BK BX is a female PCB connector designed for decentralised I/O electronics where compact connectivity and integrated NPN LED functionality are required. In practical engineering terms, this makes it an especially useful interface component for control and signal systems that benefit from dense terminal arrangements and clearer operational diagnostics.

How This NPN LED Variant Fits Into Industrial Design

This connector is part of the BL-I/O 3.50 family and is intended to work with compatible 3.50 mm male headers. Its 30-pole format makes it highly effective for signal-rich I/O modules. Because it includes NPN LED-oriented functionality, it can support use cases where specific I/O logic and visual indication need to be part of the connection concept.

Core Technical Data

The product is configured as a female plug with a 3.50 mm pitch and 180° outlet. It uses PUSH IN with actuator wire connection and supports a conductor range of 0.2 to 1.5 mm². Official product data lists IEC values of 200 V / 2.2 A and UL values of 50 V / 5 A, with AWG 24 to AWG 16 referenced for the UL range.

Why Integrated Electronics Matter

Weidmüller highlights integrated electronics in this series as a way to create more usable space on the circuit board. That is a meaningful advantage in compact control devices and decentralised modules, where every millimeter of board area can influence design efficiency and system packaging.

Weidmüller BL-I/O 3.50/30LR Operational Value

The Weidmüller BL-I/O 3.50/30LR NPN LED SN BK BX brings together several benefits: fast PUSH IN connection, reduced wiring effort, high connection density, and application-specific NPN LED functionality. In real-world projects, that combination can support both assembly productivity and improved field diagnostics.

Application Areas

Typical use cases include I/O blocks, industrial controllers, machine electronics, building automation interfaces, and electronics assemblies that depend on compact signal handling and integrated indicator-oriented design.

For more information about Weidmüller, it is worth exploring related BL-I/O variants for application-specific logic and connector selection.

Weidmüller BL-I/O 3.50/30LR FAQ

What is the main purpose of the Weidmüller BL-I/O 3.50/30LR NPN LED SN BK BX?

It is designed for decentralised I/O electronics where compact multi-pole connectivity and NPN LED-oriented integrated electronics are useful.

How many poles does it provide?

It provides 30 poles in a compact 3.50 mm pitch format.

What are the main voltage and current ratings?

The connector is listed at 200 V / 2.2 A under IEC data and 50 V / 5 A under UL data.

Why is this connector good for compact boards?

Its high pole count and integrated electronics help make more efficient use of available PCB space.

Where is this connector typically used?

It is typically used in decentralised automation, industrial I/O devices, and signal-dense interface modules.