Product Description

Siemens SIRIUS Power Contactor AC-3e/AC-3 95A, 45kW, 400V, 3-Pole, 24V DC, Size S3 – 3RT2046-1KB40

Product Description

The Siemens 3RT2046-1KB40 is a high-performance SIRIUS 3RT2 power contactor designed for reliable switching and control of three-phase motors and industrial electrical loads. It is rated at 95 A in AC-3e/AC-3 and supports motor applications up to 45 kW at 400 V. The contactor features a robust 3-pole design and Size S3 construction for demanding industrial applications.

This model operates with a 24 V DC control voltage and an operating range of 0.8–1.2 × Uc, making it suitable for control systems using 24 V DC supply and PLC-based automation. It features an integrated varistor for coil surge suppression and is specifically listed by Siemens as suitable for PLC outputs.

The contactor includes 1 NO + 1 NC auxiliary contacts for control, signaling, feedback and electrical interlocking. Screw terminals provide secure electrical connections, while the S3 frame size provides a robust solution for industrial control cabinets and motor-control panels.

Key Features

• Genuine Siemens SIRIUS Power Contactor

• Article Number: 3RT2046-1KB40

• Product Family: SIRIUS 3RT2

• Utilization Category: AC-3e/AC-3

• Rated Operational Current: 95 A

• Motor Power: 45 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: 24 V DC

• Control Voltage Range: 0.8–1.2 × Uc

• Integrated Varistor

• Connection Type: Screw Terminal

• Contactor Size: S3

• Suitable for PLC outputs

• Main Circuit Insulation Voltage: 1,000 V

• Auxiliary Circuit Insulation Voltage: 690 V

• Main Circuit Surge Withstand Voltage: 8 kV

• Auxiliary Circuit Surge Withstand Voltage: 6 kV

• Front Protection: IP20

Applications

The Siemens 3RT2046-1KB40 is suitable for:

• Three-phase motor control

• PLC-controlled motor switching

• Direct-on-line motor starters

• Motor starting and stopping

• Motor Control Centers (MCC)

• Industrial automation systems

• Machine control panels

• Pump control systems

• Fan and blower control

• Compressor control

• Conveyor systems

• HVAC motor applications

• Manufacturing machinery

• OEM control cabinets

• Industrial electrical control panels

• Factory automation systems

Benefits

• High 95 A AC-3/AC-3e switching capacity

• Suitable for motors up to 45 kW at 400 V

• 24 V DC control voltage for automation systems

• Wide 0.8–1.2 × Uc control-voltage tolerance

• Integrated varistor for coil surge suppression

• Suitable for PLC outputs

• 1 NO + 1 NC auxiliary contacts

• Robust 3-pole construction

• Secure screw-terminal connections

• Durable S3-size design

• High insulation and surge withstand capability

• Suitable for demanding industrial motor-control applications

• Reliable Siemens SIRIUS technology

Frequently Asked Questions

What is Siemens 3RT2046-1KB40?

The 3RT2046-1KB40 is a Siemens SIRIUS 3RT2 3-pole power contactor rated at 95 A AC-3e/AC-3, suitable for motors up to 45 kW at 400 V, with a 24 V DC control circuit, integrated varistor and 1 NO + 1 NC auxiliary contacts.

What is the AC-3 rating?

The contactor is rated at 95 A in AC-3/AC-3e for the specified application.

What motor power is supported?

The contactor is suitable for motor applications up to 45 kW at 400 V.

What is the control voltage?

The control voltage is 24 V DC, with an operating range of 0.8–1.2 × Uc.

Does the 3RT2046-1KB40 have an integrated varistor?

Yes. The contactor has an integrated varistor for suppression of coil switching transients.

Is this contactor suitable for PLC outputs?

Yes. Siemens specifically identifies the 3RT2046-1KB40 as suitable for PLC outputs, making it suitable for PLC-controlled industrial automation applications.

How many poles does 3RT2046-1KB40 have?

It is a 3-pole contactor with 3 NO main contacts.

What auxiliary contacts are included?

The contactor includes 1 NO + 1 NC auxiliary contacts.

What type of terminals does it use?

The contactor uses screw terminals for electrical connections.

What is the contactor size?

The Siemens 3RT2046-1KB40 is Size S3.

What is the insulation voltage?

The rated insulation voltage is 1,000 V for the main circuit and 690 V for the auxiliary circuit.

What is the surge withstand voltage?

The rated surge withstand voltage is 8 kV for the main circuit and 6 kV for the auxiliary circuit.

Is 3RT2046-1KB40 suitable for motor applications?

Yes. It is designed for AC-3e/AC-3 motor switching and is rated for 95 A and 45 kW at 400 V. Final selection should be based on the motor's rated current, operating conditions and applicable utilization category.

Where can Siemens 3RT2046-1KB40 be used?

It can be used in PLC-controlled motor panels, industrial automation systems, pumps, fans, compressors, conveyors, HVAC systems, manufacturing machinery and motor-control centers.

Is this contactor suitable for industrial automation?

Yes. Its 24 V DC coil, 0.8–1.2 × Uc operating range, integrated varistor and PLC-output suitability make it particularly suitable for PLC-based industrial automation and control applications.