The Siemens 3RT2047-1NB30 is a genuine Siemens SIRIUS 3RT2 power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It is rated for 110 A in AC-3e/AC-3 at 400 V, with a motor power rating of up to 55 kW at 400 V. The contactor features a robust 3-pole construction and belongs to the Siemens SIRIUS 3RT contactor family for applications up to 250 kW.
The contactor operates with a 20–33 V AC/DC control voltage at 50/60 Hz and has an integrated varistor for suppression of voltage transients in the coil circuit. This helps reduce switching-related voltage peaks and supports reliable operation of the control circuit.
The 3RT2047-1NB30 includes 1 NO + 1 NC auxiliary contacts for control, signaling, feedback and electrical interlocking functions. Screw terminals provide secure electrical connections, while the Size S3 design is suitable for industrial control cabinets and motor-control panels.
The contactor is suitable for motor starting, stopping and switching applications where the specified AC-3/AC-3e ratings meet the requirements of the connected motor. Its high current rating makes it suitable for demanding industrial motor-control and automation applications.
The device has a 1,000 V rated insulation voltage for the main circuit, while Siemens specifies a 690 V insulation voltage for the auxiliary circuit. The rated surge withstand voltage is 8 kV for the main circuit and 6 kV for the auxiliary circuit.
Genuine Siemens SIRIUS Power Contactor
Article Number: 3RT2047-1NB30
Product Family: SIRIUS 3RT2
Utilization Category: AC-3e/AC-3
Rated Operational Current: 110 A
Motor Power: 55 kW at 400 V
Rated Operational Voltage: 400 V
Number of Poles: 3-pole
Main Contacts: 3 NO
Auxiliary Contacts: 1 NO + 1 NC
Control Voltage: 20–33 V AC/DC
Control Frequency: 50/60 Hz
Integrated Varistor
Connection Type: Screw Terminal
Contactor Size: S3
Main Circuit Rated Insulation Voltage: 1,000 V
Auxiliary Circuit Rated Insulation Voltage: 690 V
Main Circuit Surge Withstand Voltage: 8 kV
Auxiliary Circuit Surge Withstand Voltage: 6 kV
Suitable for motor-control applications
Suitable for industrial automation and control panels
The Siemens 3RT2047-1NB30 is suitable for:
Three-phase motor switching
Motor starting and stopping
Industrial motor control panels
Motor control centers
Machine automation
Industrial automation systems
Pump control systems
Compressor control
Conveyor systems
HVAC motor applications
Manufacturing machinery
Industrial production equipment
OEM control panels
Electrical control cabinets
Heavy-duty motor-control applications
High 110 A AC-3/AC-3e switching capacity
Suitable for motors up to 55 kW at 400 V
Robust 3-pole power contactor design
Wide 20–33 V AC/DC control-voltage range
Integrated varistor helps suppress coil switching transients
1 NO + 1 NC auxiliary contacts for control and signaling
Screw terminals provide secure connections
Compact and robust S3-size construction
High insulation voltage for the main circuit
High surge withstand capability
Suitable for demanding industrial motor-control applications
Genuine Siemens SIRIUS product
Suitable for OEM, panel-building and industrial maintenance applications
The 3RT2047-1NB30 is a Siemens SIRIUS 3RT2 3-pole power contactor rated at 110 A AC-3e/AC-3, suitable for motors up to 55 kW at 400 V, with a 20–33 V AC/DC control voltage and integrated varistor.
The contactor is rated at 110 A in AC-3e/AC-3.
The specified motor power rating is 55 kW at 400 V.
The control circuit accepts 20–33 V AC/DC and operates at 50/60 Hz.
Yes. The 3RT2047-1NB30 has an integrated varistor for coil surge suppression.
It is a 3-pole contactor with 3 normally open main contacts.
The contactor includes 1 NO + 1 NC auxiliary contacts.
The contactor is Size S3.
The 3RT2047-1NB30 uses screw terminals for electrical connections.
The rated insulation voltage for the main circuit is 1,000 V.
The rated insulation voltage for the auxiliary circuit is 690 V.
The rated surge withstand voltage is 8 kV for the main circuit and 6 kV for the auxiliary circuit.
Yes. It is specifically designed for AC-3e/AC-3 motor-switching applications and is rated for 110 A and 55 kW at 400 V. The final selection should be based on the motor's rated current, power, starting conditions and applicable electrical standards.
It can be used in motor control centers, industrial automation panels, pumps, compressors, conveyors, HVAC systems, manufacturing machinery and other industrial motor-control applications.
Yes. Its 110 A AC-3 rating, 55 kW motor capacity, 20–33 V AC/DC coil, integrated varistor, auxiliary contacts and S3 construction make it suitable for demanding industrial control and motor-switching applications.
| Specification | Details |
|---|---|
| Product Name | Power Contactor |
| Brand | Siemens |
| Series | SIRIUS 3RT2 |
| Model Number | 3RT2047-1NB30 |
| SKU | 3RT2047-1NB30 |
| Product Type | Power Contactor |
| Utilization Category | AC-3e / AC-3 |
| Rated Operational Current (AC-3) | 110 A |
| Motor Rating at 400V | 55 kW |
| Number of Poles | 3 Pole |
| Main Contacts | 3 NO |
| Auxiliary Contacts | 1 NO + 1 NC |
| Coil Voltage | 20–33 V AC/DC |
| Coil Variant | NB30 |
| Frequency | 50/60 Hz |
| Integrated Protection | Varistor Surge Suppressor |
| Frame Size | S3 |
| Main Circuit Connection | Screw Terminals |
| Control Circuit Connection | Spring-Loaded Terminals |
| Rated Insulation Voltage (Ui) | 1000 V |
| Surge Voltage Resistance | 8 kV |
| Mechanical Life | Up to 10 Million Operations |
| Mounting Type | Panel Mount |
| Operating Temperature | -25°C to +60°C |
| Weight | Approx. 1.83 kg |
| Product Family | Siemens SIRIUS Contactors |
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