Siemens SIRIUS 3RQ4 Coupling Relays

Siemens SIRIUS 3RQ4 Coupling Relays Suppliers, Exporters in India

Siemens SIRIUS 3RQ4 Coupling Relays provide an interface between PLC input or output modules and field-level electrical devices. They isolate the control side from the switching side and help when a PLC output cannot directly handle the voltage, current or switching load of the connected equipment.
The 3RQ4 range is commonly installed between Siemens SIMATIC controllers and devices such as contactors, solenoid valves, indicator lamps, alarms and other control components. It can also receive signals from field devices and pass them safely to a controller input.

Siemens offers the 3RQ4 range with an integrated relay, a replaceable plug-in relay or a semiconductor output. This gives panel builders a practical choice based on the switching frequency, load type and maintenance requirement. The narrow 6.2 mm design also helps when several interface relays must fit inside a limited control-panel space.

The integrated relay version suits standard industrial switching and is available with optional gold-plated contacts for low-current signals. Plug-in versions allow maintenance teams to replace the relay without changing the complete interface module. Semiconductor versions work well in applications involving fast, frequent and silent switching.

ARP IMPEX supplies and exports Siemens SIRIUS 3RQ4 Coupling Relays for industrial automation panels, PLC systems, machine control panels and replacement requirements. Share the complete Siemens part number, input voltage, output type and required quantity for pricing and availability.

Technical Specifications

• Brand: Siemens
• Product range: SIRIUS
• Series: 3RQ4
• Product type: Coupling relay / interface relay
• Design: Narrow control-panel interface module
• Module width: 6.2 mm on commonly used models
• Available versions: Integrated relay output, plug-in relay and semiconductor output
• Available functions: Input coupling and output coupling
• Contact options: Changeover contact or normally open semiconductor output, depending on the model
• Contact material: Standard silver alloy or hard gold-plated contacts, depending on the version
• Control voltages: AC, DC or combined AC/DC versions
• Common operating voltages: 24 V DC, 24 V AC/DC, 115 V AC/DC and 230 V AC/DC, depending on the article number
• Thermal current: Up to 6 A on selected relay and semiconductor versions
• Operational current: Depends on the output type, voltage and utilization category
• Connection options: Screw terminals or spring-loaded push-in terminals
• Mounting: Snap-on mounting on a standard DIN rail
• Rated insulation voltage: Up to 300 V on commonly used models
• Rated impulse withstand voltage: Up to 4 kV on commonly used models
• Mechanical service life: Up to approximately 10 million operating cycles for selected relay versions
• Operating temperature: Generally from -25°C to +60°C, depending on the selected model
• Switching type: Monostable relay or semiconductor switching, depending on the version
• Available accessories: Connection combs, isolation plates, replacement relays and marking accessories
• Approvals: Model-dependent international and industrial approvals
• Standards: Relay and semiconductor versions comply with the applicable IEC and EN product standards
• Specifications vary across the 3RQ4 range. The exact article number must be checked before confirming the control voltage, contact rating, output current or certification. Selected 3RQ4 models have a 6.2 mm width, 6 A thermal current, 300 V insulation voltage and 4 kV impulse withstand voltage.

Available Siemens SIRIUS 3RQ4 Versions

3RQ4 Coupling Relays with Integrated Relay Output

These versions contain a permanently installed electromechanical relay. They suit standard control-panel applications where the relay switches contactors, solenoid valves, signalling devices or other control loads.

Integrated versions are available as input and output couplers. Selected models also come with hard gold-plated contacts for switching low currents and low-level signals. Siemens offers versions with safety-related B10d values and ATEX approval for applicable industrial environments.

3RQ4 Coupling Relays with Plug-in Relay

Plug-in versions make relay replacement easier during maintenance. The relay can be removed from its socket without replacing the complete terminal module or disturbing the panel wiring.

These models are useful in plants where relay wear, planned maintenance or quick replacement matters. Common versions provide one changeover contact with a thermal current of up to 6 A. Screw-terminal and push-in terminal models are available.

3RQ4 Coupling Relays with Semiconductor Output

Semiconductor versions switch without mechanical contacts. They operate silently and handle high switching frequencies without the normal contact wear found in an electromechanical relay.

These versions suit applications involving rapid operating cycles, repetitive machine movements, high-speed signalling or locations where relay replacement would interrupt production. Depending on the selected model, semiconductor outputs can handle currents of up to 6 A.

Features

• Slim 6.2 mm housing saves DIN rail space inside control panels.
• Provides electrical isolation between PLC signals and field circuits.
• Available for both input and output coupling duties.
• Integrated, plug-in and semiconductor versions cover different switching requirements.
• Plug-in relay models simplify maintenance and relay replacement.
• Semiconductor models support fast, silent and frequent switching.
• Screw and push-in terminal options suit different panel-wiring practices.
• Gold-plated contact options support low-current and low-level signal switching.
• AC, DC and AC/DC control-voltage options cover common industrial systems.
• Connection combs reduce individual wiring when several relays share the same potential.
• The range works well with Siemens SIMATIC controllers and SIRIUS switching products.
• Selected models support demanding environments and specific industrial approvals.
• Narrow construction allows several coupling relays to sit side by side without wasting panel space.

Siemens designed the 3RQ4 series for controller interfaces, signal isolation, voltage-level matching and signal amplification. The range has been tested for use with Siemens controller systems.

Applications

• Siemens SIRIUS 3RQ4 Coupling Relays are used in:
• PLC input and output interface circuits
• Industrial automation panels
• Machine control panels
• Motor control centres
• Contactor and motor starter control
• Solenoid valve switching
• Conveyor control systems
• Packaging and production machinery
• Pump and compressor panels
• HVAC control systems
• Process plant automation
• Control-signal isolation
• Voltage-level conversion
• Signal amplification circuits
• Alarm and indication circuits
• Building automation panels
• Railway and transportation control systems
• Industrial maintenance and relay replacement

Siemens 3RQ4 Coupling Relay Supplier and Exporter

ARP IMPEX supplies Siemens SIRIUS 3RQ4 Coupling Relays for new control-panel construction, machine automation, system expansion and replacement of older coupling relays. The range includes integrated relay, plug-in relay and semiconductor-output versions with different control voltages and terminal arrangements.

Siemens introduced the 3RQ4 range as the successor to the older SIRIUS 3RQ3 coupling relay series. Buyers replacing a 3RQ3 relay should share the full existing part number rather than selecting a 3RQ4 model only by voltage. Terminal arrangement, input or output function, contact type and wiring configuration must also match the application.