Circular Cable Assemblies

Part Number	Description / PDF	Quantity
00550670 Wickmann / Littelfuse	COMPLETE 7P 24V/N COIL/20 LU 3.5	0
00555700 Wickmann / Littelfuse	BICOIL ADAPTER 15P - LU 4500	40
00552800 Wickmann / Littelfuse	COMPLETE 7P 24V/S COIL/60 LU 4.5	120
00552670 Wickmann / Littelfuse	COMPLETE 7P 24V/N COIL/20 LU 3.5	0
00552900 Wickmann / Littelfuse	COMPLETE 7P 24V/N COIL/60 LU 4.5	102
00550600 Wickmann / Littelfuse	COMPLETE 7P 24V/N COIL/20 LU 4.5	0
00558700 Wickmann / Littelfuse	COIL COMP.24V-EBS LU.3.5 D.40	0
00552400 Wickmann / Littelfuse	COMPLETE 7P 24V/N COIL/60 LU 4.5	14
00557400 Wickmann / Littelfuse	COIL COMP.24V-EBS LU.4.5 D.80	0
00553100 Wickmann / Littelfuse	COIL 12V.N COMPLETE	15
00558789 Wickmann / Littelfuse	COIL COMP.24V-EBS LU.5.5 D.30	0
00251074 Wickmann / Littelfuse	EL.WIRING FOR FIAT PANDA 139 13P	0
00521135 Wickmann / Littelfuse	"COMPLETE 15P COIL LU.3.5 ""FAIR	0
00552761 Wickmann / Littelfuse	COMPLETE 7P 24V/S COIL/20 LU 3.5	20
00556771 Wickmann / Littelfuse	COIL WITH 1 PLUG 24V-ABS 5P/30	0
00556670 Wickmann / Littelfuse	COMPLETE COIL 24V-ABS 5P/30 LU.4	30
00550900 Wickmann / Littelfuse	COMPLETE 7P 24V/S COIL/20 LU 4.5	84
00551361 Wickmann / Littelfuse	COMPLETE COIL 12V.N-7P/40 LU 4.5	0
00558400 Wickmann / Littelfuse	COIL COMP.24V-EBS LU.4.5 D.40	230
00550700 Wickmann / Littelfuse	COMPLETE 7P 24V/S COIL/20 LU 4.5	0

Circular Cable Assemblies

1. Overview

Circular Cable Assemblies are engineered interconnect solutions designed to transmit electrical signals or power through circular-shaped connectors. These assemblies combine multiple wires or cables terminated with circular connectors, ensuring reliable connectivity in demanding environments. Their importance spans across industries requiring robust, high-density, and high-performance connections, particularly in applications where space constraints and environmental resilience are critical.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Circular Push-Pull	Quick-mating design with mechanical locking	Industrial automation, medical devices
Circular Threaded	Vibration-resistant threaded coupling	Aerospace, military equipment
Waterproof Circular	IP67+ sealing against liquids and dust	Outdoor telecom equipment, underwater sensors
High-Density Circular	Miniaturized contacts for compact designs	Avionics, robotics

3. Structure and Components

A typical circular cable assembly consists of:

Conductors: Copper/aluminum for signal/power transmission
Insulation: PVC/TPE/PUR jackets for dielectric protection
Shielding: Braided copper or foil for EMI/RFI protection
Connector Housing: Metal/plastic shells with precision contacts
Retention System: Latches, threads, or bayonet couplings

Modular designs allow customization with hybrid signal/power/RF configurations.

4. Key Technical Specifications

Parameter	Importance
Current Rating (Amps)	Determines power transmission capacity
Voltage Rating (Volts)	Defines dielectric strength and safety margins
Contact Resistance (m )	Impacts signal integrity and power efficiency
Operating Temperature (-40 C to +125 C)	Ensures reliability in extreme environments
Mating Cycles (1000-10,000)	Indicates mechanical durability
IP Rating (IP65-IP68)	Defines environmental protection level

5. Application Fields

Primary industries include:

Industrial Automation: PLCs, CNC machines, robotic arms
Telecommunications: 5G base stations, fiber optic enclosures
Medical Equipment: MRI scanners, patient monitoring systems
Aerospace: Avionics, flight control systems
Transportation: Rail signaling systems, EV charging stations

Case Study: In automotive manufacturing, circular assemblies enable high-vibration resistance connections in robotic welding cells operating 24/7.

6. Leading Manufacturers and Products

Manufacturer	Representative Product
TE Connectivity	DEUTSCH DT Series circular connectors
Amphenol	CIRCULAR C Series high-density connectors
Molex	Circular Rast 55 series for industrial control
Delphi	Weatherproof automotive circular connectors

7. Selection Guidelines

Key considerations:

Electrical requirements (current/voltage profiles)
Environmental conditions (temperature, moisture, chemical exposure)
Mechanical demands (vibration, mating cycles, cable bend radius)
Space constraints (connector size and orientation)
Industry-specific certifications (e.g., MIL-STD, UL, RoHS)

Recommend verifying compatibility with existing infrastructure and performing thermal cycling tests for critical applications.

8. Industry Trends

Emerging developments include:

Miniaturization while maintaining high contact density
Integration of fiber optics and high-speed data transmission
Adoption of composite materials for weight reduction
Growing demand for waterproof connectors in outdoor IoT deployments
Standardization of hybrid power/signal interfaces in EV charging

Market forecasts predict 8.2% CAGR through 2027 driven by industrial IoT and 5G infrastructure investments.