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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RT2028-1BB40 |
| Alternative Part Number | 3RT20281BB40 |
| Manufacturer | Siemens |
| Product Type | Power Contactor |
| Number of Contacts | 3 Normally Open (NO) |
| Rated Operational Current | 50 A |
| Rated Operational Power | 48 kW |
| Rated Operational Voltage | 690 V ac |
| Contactor Size | S0 |
| Supply Voltage Type | AC (Supply); DC (Control) |
| Operating Frequency | 1000 MHz |
| Degree of Protection | IP20 |
| Commodity Code | 853649 |
| Mounting Type | Screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715 |
| Connection Type | Screw-type terminals for main, auxiliary, and control current circuits |
| UL/CSA Ratings | Mechanical performance for various squirrel cage motors at specified voltages and horsepower |
| Operating Current (FLA) | For three-phase squirrel cage motors at 480 V: 34 A; at 600 V: 27 A |
| Contact Rating Designation | For auxiliary contacts according to UL: A600 / Q600 |
| Dimensions (H x W x D) | 85 mm x 45 mm x 107 mm |
| Required Spacing | For side-by-side mounting and spacing from grounded and live parts |
| Connectable Conductor Types | Solid, stranded, finely stranded with core end processing |
| Connectable Conductor Range | 1 ... 10 mm² |
The Siemens 3RT2028-1BB40 is a robust power contactor designed to handle high switching frequencies and is suitable for a wide range of industrial applications. This contactor is part of the SIRIUS product family and is engineered to facilitate efficient and reliable switching of motors. It is capable of managing AC-3 loads up to 18.5 kW at 400 V, making it an excellent choice for controlling three-phase motors.
With a size S0 footprint, the 3RT2028-1BB40 offers a compact solution that is easy to integrate into existing systems. It features three normally open (NO) main contacts and a control voltage rating of DC 24V, ensuring compatibility with various control systems. The contactor is designed with screw terminals for secure and straightforward wiring.
The device boasts an insulation voltage rated at 690 V and a surge voltage resistance of 6 kV, providing a high level of protection for the contactor and the circuits it controls. It is also equipped with an auxiliary switch, enhancing its functionality for complex control circuits.
Constructed with safety in mind, the 3RT2028-1BB40 has a protection class of IP20, ensuring finger-safe operation and protection against solid objects. It is designed to withstand challenging environmental conditions, with an operational temperature range of -25 to +60 °C and storage temperatures ranging from -55 to +80 °C.
The mechanical service life of this contactor is impressive, with up to 10 million switching cycles, indicating its durability and long-term reliability. Its design also allows for easy maintenance and straightforward replacement, which is essential for minimising downtime in industrial settings.
Overall, the Siemens 3RT2028-1BB40 power contactor is a high-quality component that offers reliability, durability, and versatility for controlling motors and other electrical loads in a variety of industrial applications.
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Frequently Asked Questions
What type of contactor is this?
This is a power contactor designed for switching an electrical power circuit, similar to a relay except with higher current ratings. It's suitable for controlling electric motors and other high power loads.
Can this contactor be used with three-phase motors?
Yes, it is suitable for use with three-phase squirrel cage motors and provides different horsepower ratings depending on the voltage level.
What is the rated operating voltage for this contactor?
The rated operating voltage for this contactor at AC-3 is up to 690 V.
What is the insulation voltage rating of this contactor?
The insulation voltage rating of this contactor is 690 V.
What is the mechanical service life of this contactor?
The mechanical service life of the contactor is typically 10 million operating cycles.
What is the operating current rating at AC-1 for this contactor?
The operating current rating at AC-1 for this contactor is 50 A at 400 V in an ambient temperature of 40°C.
Does this contactor have auxiliary contacts?
Yes, it comes with 1 normally open (NO) and 1 normally closed (NC) auxiliary contact for instantaneous switching.
What is the control supply voltage for this contactor?
The control supply voltage for this contactor is 24 V DC.
What are the dimensions of this contactor?
The dimensions for this contactor are not specified here. Please refer to the manufacturer's datasheet for detailed dimensions.
Is this contactor suitable for use in safety applications?
This contactor does not have positively driven operation according to IEC 60947-5-1, which is often a requirement for safety applications.
What is the frequency of operation for this contactor?
The frequency of operation varies depending on the load category, ranging from 250 operations per hour at AC-4 to 1000 operations per hour at AC-1.
What is the ambient temperature range for operating this contactor?
The ambient temperature range for operating this contactor is from -25°C to +60°C.
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