Siemens SIRIUS 3RH2 Contactor Relays
Siemens SIRIUS 3RH2 Contactor Relays Suppliers, Exporters in India
Siemens SIRIUS 3RH2 Contactor Relays handle auxiliary switching duties inside motor control panels, automation panels, machine control systems and industrial switchboards. They are commonly used when a control circuit needs additional normally open or normally closed contacts for interlocking, signalling, sequence control or contactor operation.
The 3RH2 range comes in compact S00 construction and includes 4-pole, 8-pole and latched contactor relay versions. Buyers can select the relay according to the required contact arrangement, coil voltage and terminal type. Siemens offers models with screw terminals as well as spring-loaded terminals, making the range suitable for new panel construction and replacement requirements.
These relays are frequently used with Siemens SIRIUS contactors, motor starters and control components. Selected 3RH21 models also work as coupling contactor relays for direct control through PLC outputs.
ARP IMPEX supplies and exports Siemens SIRIUS 3RH2 Contactor Relays for industrial panels, OEM machines, project requirements and maintenance replacements. Share the complete Siemens part number, coil voltage, contact configuration, quantity and delivery location for a suitable quotation.
Technical Specifications
- Brand: Siemens
- Product range: SIRIUS
- Series: 3RH2
- Product type: Contactor relay / auxiliary control relay
- Frame size: S00
- Available versions: 4-pole, 8-pole and latched contactor relays
- Main series types: 3RH21, 3RH22 and 3RH24
- Contact configurations: 4 NO, 3 NO + 1 NC, 2 NO + 2 NC, 4 NO + 4 NC, 6 NO + 2 NC and other model-specific combinations
- Coil operation: AC or DC, depending on the selected part number
- Terminal options: Screw terminals or spring-loaded terminals
- Mounting method: Screw mounting or snap-on mounting on 35 mm DIN rail
- Rated insulation voltage: Up to 690 V
- Rated impulse withstand voltage: Up to 6 kV
- Degree of protection: IP20 at the front
- Operating temperature: Generally -25°C to +60°C, depending on the model
- Mechanical endurance: Up to 30 million operating cycles, depending on the version
- Contact expansion: Additional auxiliary contacts available for selected 3RH21 models
- Applicable standards: IEC/EN 60947-1, IEC/EN 60947-4-1 and IEC/EN 60947-5-1
- Available accessories: Auxiliary contact blocks, surge suppressors and function modules
- Control applications: Interlocking, signalling, sequence control, PLC interfacing and auxiliary switching
Available Siemens SIRIUS 3RH2 Versions
Siemens 3RH21 4-Pole Contactor Relays
The 3RH21 range covers common control applications where four auxiliary contacts are required. Available contact arrangements include 4 NO, 3 NO + 1 NC and 2 NO + 2 NC. Applicable models can take front-mounted auxiliary contact blocks when the control circuit needs more contacts.
Siemens 3RH22 8-Pole Contactor Relays
The 3RH22 range provides eight permanently mounted auxiliary contacts in one relay. Common arrangements include 4 NO + 4 NC and 6 NO + 2 NC. These models suit control circuits where several interlocking, indication or switching contacts must operate together.
Siemens 3RH24 Latched Contactor Relays
The 3RH24 version keeps its switching position after the control pulse has ended. It is useful in circuits where the relay must retain its status without keeping the coil continuously energized.
Siemens 3RH21 Coupling Contactor Relays
Coupling versions are available for interfacing electronic controllers and solid-state PLC outputs with conventional control circuits. These models have adapted coil consumption, and selected versions come with integrated diode or suppressor-diode protection.
Features
- Compact S00 construction saves space inside crowded control panels.
- Available with four or eight auxiliary contacts.
- Multiple NO and NC contact combinations suit different control logic.
- AC and DC coil versions cover common industrial control voltages.
- Screw and spring-loaded terminal options simplify panel wiring.
- Applicable 3RH21 models accept additional auxiliary contact blocks.
- High contact stability supports low-voltage and low-current control circuits.
- Selected coupling versions can connect directly to PLC outputs.
- Front-mounted surge suppressors help control coil switching surges.
- Positively driven contacts are available on applicable versions for safety-related control circuits.
- DIN rail mounting makes installation and replacement straightforward.
Siemens specifies reliable switching for low-level circuits from 17 V and 1 mA on suitable versions. The range also supports front-mounted auxiliary switches, surge suppressors and function modules, depending on the selected model.
Applications
Siemens SIRIUS 3RH2 Contactor Relays are commonly used in:
- Motor control centres and starter panels
- Machine automation panels
- PLC-controlled switching circuits
- Electrical interlocking circuits
- Star-delta and reversing starter circuits
- Conveyor and material-handling systems
- Pump and compressor control panels
- HVAC and ventilation systems
- Process plant control systems
- Control desk and indication circuits
- Packaging and production machinery
- Industrial maintenance and replacement work
- Siemens 3RH2 Contactor Relay Supplier and Exporter
ARP IMPEX supplies Siemens SIRIUS 3RH2 Contactor Relays for replacement, panel-building, OEM and industrial project requirements. We can quote standard contactor relays, PLC coupling versions, latched models and compatible accessories against the exact Siemens article number.
