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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RB3123-4VB0 |
| Alternative Part Number | 3RB31234VB0 |
| Manufacturer | Siemens |
| Product Type | Overload Relay |
| Size | S0 |
| Number of Poles | 3 |
| Insulation Voltage | Rated at 690 V with degree of pollution 3 |
| Impulse Voltage Resistance | Rated at 6 kV |
| Protection Class IP | IP20 for terminals and front |
| Electrical Shock Protection | Finger-safe |
| Overload Protection | Yes |
| Phase Disturbance Recognition | Yes |
| Short-Circuit to Earth Recognition | Yes |
| Auxiliary Switch | Yes |
| Trip Indicator | Yes |
| Main Circuit Connection Type | Screw Connection |
| Auxiliary Circuit Connection Type | Screw Connection |
| Manual-Automatic-Reset | Integrated Ground Fault Detection |
| Ambient Operating Temperature | -25 to +60 °C |
| Relative Humidity | Up to 95% during operating phase |
| EMC Immunity to Interference | Corresponds to degree of severity 3 according to IEC 60947-1 |
| EMC Emitted Interference | CISPR 11, environment B (residential area) |
| Electrostatic Discharge | 6 kV contact discharge / 8 kV air discharge |
| Operating Current at AC-3 | 40 A at 400 V |
| Auxiliary Contacts Operating Current | 4 A at AC-15 at 24 V |
| Control Circuit/Control | Type of assignment 2 |
| Active Power Loss | Total typical 3 W |
| Contactor Size Compatibility | Can be combined with size S0 contactors |
The Siemens 3RB3123-4VB0 is a state-of-the-art solid-state overload relay designed for motor protection. This component is part of the SIRIUS product family and is engineered to provide reliable protection for motors in a variety of industrial applications. With a size S0 footprint, it is compact and suitable for direct mounting, making it an ideal choice for integration into existing systems.
This overload relay offers adjustable trip classes (CLASS 5E, 10E, 20E, and 30E), allowing for precise protection settings tailored to specific motor requirements. The adjustable response current ranges from 10 to 40 A, ensuring versatility across different motor sizes and applications. The relay also features integrated auxiliary contacts, with one normally closed (NC) and one normally open (NO) contact, to facilitate straightforward status signalling.
The 3RB3123-4VB0 is designed to withstand challenging industrial environments, with an insulation voltage rated at 690 V and a surge voltage resistance of 6 kV. It is also equipped with ground fault detection, enhancing the safety and protection of your motor systems. The relay operates effectively within a wide temperature range, from -25 to +60 °C, and at installation altitudes of up to 2000 metres above sea level, ensuring consistent performance even in extreme conditions.
With its robust construction and comprehensive protective features, the Siemens 3RB3123-4VB0 overload relay is a reliable and efficient solution for safeguarding motors against overload, phase imbalance, and ground faults, contributing to the longevity and uninterrupted operation of your industrial equipment.
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Frequently Asked Questions
What is the function of this overload relay?
The overload relay is designed to protect motors from overcurrent situations, ensuring safe operation by tripping the circuit when current exceeds a preset level.
Can this overload relay be used with high-efficiency motors?
Yes, it is suitable for use with high-efficiency motors and helps to reduce nuisance tripping while saving on energy costs.
What are the main features of this overload relay?
Key features include adjustable trip classes, phase disturbance recognition, short-circuit to earth recognition, and manual or automatic reset options.
How can I mount this overload relay?
The relay is designed for direct mounting and can be positioned in any orientation, providing flexibility in installation.
What type of terminals does this overload relay have?
It comes with screw-type terminals for both the main current circuit and the auxiliary and control current circuit.
Is there a specific ambient temperature range for operating this overload relay?
The relay operates effectively within an ambient temperature range of -25 to +60 degrees Celsius.
What is the insulation voltage rating for this overload relay?
The insulation voltage rating with a degree of pollution 3 is 690 V.
What is the maximum operating altitude for this overload relay?
The maximum operating altitude for the relay is 2,000 meters above sea level.
Does this overload relay have any certifications for use in hazardous locations?
Yes, it has certifications according to the ATEX directive for use in potentially explosive atmospheres.
What is the thermal current rating for this overload relay?
The thermal current rating for this relay is 40 A.
