Phoenix Contact – FKC 2,5/ 5-ST-5,08 – PCB connector – 1873087

In modern electrical and electronic systems, reliable signal and power connection is a fundamental requirement for stable system performance. Whether in industrial automation, PCB-based control systems, power distribution modules, or embedded electronic devices, connector quality directly impacts safety, efficiency, and long-term reliability.

The FKC 2.5/..-ST series COMBICON PCB connector (5-position, 5.08 mm pitch) is designed to meet these demands with a robust push-in spring connection system, high electrical ratings, and flexible conductor compatibility.

Product Overview

The FKC 2.5/..-ST connector belongs to the COMBICON Connectors M series, widely used in PCB-mounted industrial electronics.

Key Product Information:

• Product Type: PCB Connector

• Series: FKC 2.5/..-ST

• Connection System: COMBICON MSTB 2.5

• Positions: 5

• Pitch: 5.08 mm

• Rows: 1

• Potentials: 5

• Connection Type: Push-in spring connection

• Mounting Type: Without mounting hardware

• Locking: Without interlock system

This compact design makes it suitable for high-density PCB layouts where reliable multi-point connections are required.

Electrical Performance Characteristics

One of the key advantages of this connector is its stable electrical performance under industrial operating conditions.

Rated Electrical Data:

• Nominal Current: 12 A

• Nominal Voltage: 320 V

• Rated Voltage (II/2): 630 V

• Contact Resistance: 1 mΩ

• Rated Surge Voltage: 4 kV

Key Electrical Benefits:

• Stable current transmission for medium-power circuits

• Low contact resistance ensures minimal energy loss

• High surge voltage tolerance improves safety in unstable environments

• Suitable for both AC and DC applications

These characteristics make the connector suitable for control systems, power modules, and industrial PCB assemblies.

Advanced Push-In Spring Connection Technology

The connector uses a push-in spring connection system, which eliminates the need for traditional screw-based tightening.

Advantages of Push-In Technology:

• Faster wiring process

• Tool-free conductor insertion

• Secure and vibration-resistant connection

• Reduced installation time in mass production

• Stable long-term contact pressure

This technology is especially valuable in automated manufacturing environments where efficiency and consistency are critical.

Conductor Compatibility and Flexibility

The FKC 2.5/..-ST connector supports a wide range of conductor types, making it highly adaptable for different wiring requirements.

Supported Conductor Ranges:

• Rigid conductors: 0.2 – 2.5 mm²

• Flexible conductors: 0.2 – 2.5 mm²

• AWG range: 24 – 12

• Ferrule-supported conductors: 0.25 – 2.5 mm²

Twin Ferrule Compatibility:

• 0.5 – 1.5 mm² (with TWIN ferrule)

Stripping Length:

• Standard: 10 mm

This flexibility allows engineers to use the same connector across multiple circuit designs, reducing component variation and simplifying inventory management.

Mechanical Structure and Reliability

The connector is designed with industrial durability in mind, ensuring stable performance even under vibration and long-term operation.

Mechanical Features:

• Compact 5-position structure

• 5.08 mm standardized pitch for PCB compatibility

• Secure socket contact system

• Stable conductor retention force

• No-lock design for flexible integration

Cylindrical Gauge Specification:

• 2.8 mm × 2.0 mm / 2.4 mm diameter

These design choices help ensure consistent mechanical stability in industrial environments.

Electrical Safety and Standards Compliance

The connector is designed to meet industrial safety requirements across different voltage categories.

Voltage Categories:

• III/3: 320 V / 4 kV surge

• III/2: 320 V / 4 kV surge

• II/2: 630 V / 4 kV surge

These classifications ensure compatibility with a wide range of industrial and commercial electrical systems.

Material Handling and Crimping Requirements

Proper conductor preparation is essential for achieving optimal electrical performance.

Recommended Crimping Tool:

• CRIMPFOX 6 (1212034)

Ferrule Standards:

• DIN 46228-1 (without insulation collar)

• DIN 46228-4 (with insulation collar)

Ferrule Length Guidelines:

• 0.5 – 1.5 mm²: 8–10 mm

• 2.5 mm²: 10 mm

Following correct crimping standards ensures stable conductivity and long-term connection reliability.

Industrial Applications

Due to its versatility and stable performance, the FKC 2.5/..-ST connector is widely used in multiple industries.

Typical Application Areas:

• Industrial automation systems

• PCB control modules

• Power distribution units

• Building control systems

• Energy monitoring devices

• Mechanical equipment controllers

• Electrical instrumentation systems

Its compact structure and reliable electrical performance make it ideal for dense electronic assemblies.

Product Logistics and Commercial Data

Basic Commercial Information:

• Item Number: 1873087

• Minimum Order Quantity: 100 pcs

• Packing Unit: 100 pcs

• Country of Origin: China

• Weight per Piece: ~8.76 g (including packaging)

This standardized packaging supports efficient bulk procurement for OEM and industrial customers.

Why This Connector Is Widely Used in Industrial PCB Design

Modern electronic systems require connectors that combine:

• High electrical reliability

• Fast installation

• Compact design

• Strong vibration resistance

• Long service life

The FKC 2.5/..-ST connector meets these requirements through its push-in spring mechanism, standardized pitch design, and broad conductor compatibility.

Conclusion

The FKC 2.5/..-ST 5-position PCB connector is a reliable and efficient solution for industrial electrical connection needs. Its combination of:

• 12 A current capacity

• 320 V rated voltage

• Push-in spring technology

• Wide conductor compatibility

• Compact 5.08 mm pitch design

makes it suitable for a wide range of PCB-based industrial applications.

For engineers and manufacturers seeking stable, space-saving, and efficient wiring solutions, this connector provides a practical and scalable choice for modern electrical system design.