The Siemens 3RT2018-1BB428K is a SIRIUS power contactor designed for reliable switching and control of three-phase motors in industrial and commercial electrical systems. It is rated 16 A for AC-3 applications and is suitable for motor loads up to 7.5 kW at 400 V. The contactor features a 24 V DC control coil, 3 main poles, 1 NC auxiliary contact, screw terminal connections, and a compact S00 size.
This Siemens power contactor is suitable for motor starters, DOL motor control, industrial control panels, pumps, compressors, conveyors, HVAC systems, machine tools, and industrial automation applications. Its compact S00 construction allows efficient installation in motor control panels where reliable switching and space-efficient components are required.
The 24 V DC coil makes the contactor suitable for low-voltage DC control circuits and PLC-based automation systems. For complete motor protection, it can be paired with a compatible Siemens thermal overload relay or motor protection device selected according to the motor's rated current.
Brand: Siemens
Product Family: SIRIUS 3RT
Model: 3RT2018-1BB428K
Utilization Category: AC-3
Rated Operational Current: 16 A
Motor Rating: 7.5 kW at 400 V
Main Poles: 3-Pole
Control Voltage: 24 V DC
Auxiliary Contact: 1 NC
Terminal Connection: Screw Terminal
Contactor Size: S00
Product Type: Power Contactor
Application: Three-phase motor switching and control
Three-phase motor control
DOL motor starters
Industrial motor control panels
Pump control systems
Compressor applications
Conveyor systems
HVAC equipment
Machine tools
Factory automation
PLC-controlled motor systems
OEM control panels
Industrial electrical systems
Reliable 16 A AC-3 motor switching
Suitable for motors up to 7.5 kW at 400 V
24 V DC control coil
1 NC auxiliary contact for control and interlocking applications
Secure screw-terminal connections
Compact S00 design
Suitable for PLC and automation systems
Easy integration into industrial control panels
Suitable for use with compatible motor protection devices
Reliable Siemens SIRIUS technology
The Siemens SIRIUS 3RT2018-1BB42 series provides dependable motor switching for industrial applications. With a 16 A AC-3 rating, 7.5 kW motor capacity at 400 V, 24 V DC coil, 3-pole configuration, 1 NC auxiliary contact, screw terminals, and S00 size, it is suitable for a wide range of motor-control and automation requirements.
At SB Smart, Faridabad, we supply genuine Siemens SIRIUS power contactors, thermal overload relays, motor protection relays, motor protection circuit breakers, soft starters, MCCBs, MCBs, and industrial automation products at competitive prices. We provide GST invoices, technical assistance, bulk-order support, secure packaging, and delivery across Faridabad, Delhi NCR, and major cities throughout India.
Whether you are sourcing a Siemens contactor for a motor starter, electrical control panel, industrial automation project, replacement requirement, or bulk procurement, SB Smart provides product assistance and nationwide supply support.
Q1. What is Siemens 3RT2018-1BB428K?
It is a Siemens SIRIUS power contactor used for switching and controlling three-phase motors and industrial electrical loads.
Q2. What is the rated current?
The contactor is rated at 16 A for AC-3 applications.
Q3. What motor power can it handle?
It is suitable for motor applications up to 7.5 kW at 400 V.
Q4. What is the control voltage?
The contactor uses a 24 V DC control coil.
Q5. How many main poles does it have?
It has 3 main poles for three-phase motor switching.
Q6. Does it have an auxiliary contact?
Yes. This variant has 1 NC auxiliary contact.
Q7. What type of terminals does it use?
It uses screw terminal connections.
Q8. What is the contactor size?
It is a compact S00-size contactor.
Q9. Can it be used in a DOL starter?
Yes. It can be used as the main contactor in a DOL motor starter when paired with an appropriately rated motor-protection device.
Q10. Where can I buy Siemens contactors in India?
SB Smart, Faridabad supplies Siemens SIRIUS contactors and industrial electrical and automation products with GST billing, technical assistance, bulk-order support, secure packaging, and delivery across India.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2018-1BB428K |
| Product Type | Power Contactor |
| Contactor Configuration | 3 Pole |
| Rated Current (AC-3) | 16 A |
| Motor Rating | 7.5 kW @ 400 V AC |
| Coil Type | 24 V DC |
| Auxiliary Contact | 1 NO |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S00 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
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