Siemens 3RK1902-4HB50-5AA0 Connector

Technical Specifications and Connector Design

This circular connector serves as a field wiring interface for Siemens AS-Interface systems. The Siemens 3RK1902-4HB50-5AA0 connects sensors and actuators to yellow flat cables securely. You can install this component outdoors or in wet industrial environments. Its rugged construction withstands vibration, moisture, and temperature extremes. The connector weighs approximately 0.08 kilograms. Its dimensions measure 6 cm in length and 3 cm in diameter.

Parameter	Specification
Brand	Siemens
Model	3RK1902-4HB50-5AA0
Category	Circular Connector / AS-Interface Field Connector
Weight	0.08 kg (80 grams)
Length	6 cm
Diameter	3 cm
Connector Type	M12 circular (male)
Number of Pins	4 pins (2 for power, 2 for data)
Cable Interface	AS-Interface yellow flat cable (2-conductor)
Ingress Protection	IP67 (dust-tight and waterproof)
Rated Voltage	30V DC maximum
Rated Current	4 Amps per pin
Contact Material	Gold-plated brass
Housing Material	Nickel-plated zinc alloy
Operating Temperature	-25°C to +85°C
Energy Storage	None (passive component)
Component Count	1 connector body, 4 contacts, 1 sealing gasket

AS-Interface System Integration

This connector terminates a standard AS-Interface yellow flat cable. The cable carries both 30V DC power and communication signals simultaneously. You can connect up to 62 slave devices on a single AS-i network. The Siemens 3RK1902-4HB50-5AA0 uses insulation-piercing technology for quick installation. This technology eliminates the need for wire stripping or soldering. Simply press the cable into the connector slot firmly. The internal contacts cut through the cable insulation automatically.

Environmental Protection and Durability

The connector carries an IP67 rating for complete dust and water protection. You can submerge this device in shallow water without damage. The nickel-plated housing resists corrosion from industrial chemicals and oils. A rubber sealing gasket prevents moisture ingress at the cable entry point. The gold-plated contacts maintain reliable connections even after many mating cycles. Consequently, this connector suits washdown environments like food processing plants. You should inspect the sealing gasket for damage before each installation.

Installation and Wiring Guidelines

You must use a small screwdriver to secure the cable inside the connector body. The piercing process requires firm, even pressure across the cable width. The Siemens 3RK1902-4HB50-5AA0 accepts only genuine AS-Interface yellow flat cable. Standard round cables will not fit or terminate correctly. You should verify the cable orientation matches the connector markings clearly. Reversing the power and data lines will damage connected devices. The connector does not require any special tools for assembly.