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Electrical Products Switching devices

Easy on. Easy off. Day and night. Switching with SIRIUS

The comprehensive range of SIRIUS switching devices meets diverse requirements for the switching of industrial loads. It extends from contactors, contactor combinations and soft starters to solid-state switching devices for the frequent switching of ohmic loads and motors.

The SIRIUS modular system with its components for the switching, starting, protection and monitoring of motors and industrial systems stands for the fast, flexible, and space-saving construction of control cabinets.

SIRIUS Control offers the largest available switching device portfolio in the market. A completely new generation of circuit breakers, contactors, overload relays and load feeders in seven sizes up to 250 kW is ready for use. The benefit of the modular system lies in its modular set-up of the components across all sizes. Everything fits together!

Contactors and contactor assemblies

Switching of electric drives or motors: a classic product with a decades-old functional principle interpreted in a modern and future-oriented way: these are our contactors, a generalist for switching motors.

Whether switching normal motors or high-efficiency motors (IE3), whether reversing or star-delta starting from the smallest to the largest power range, whether classic screwing or connecting using spring-cage technology or direct digital control. Our motor contactors can do all this and much more. No drive is too small or no motor start-up too heavy.

Switching with SIRIUS means high contact reliability, prolonged endurance, and usability in extreme conditions. The integration of SIRIUS contactors in engineering and selection tools supports you in digitalization.

The 3RT contactors are available with screw terminals (box terminals or flat connectors) or with spring-loaded terminals.

  • Star-delta combinations

Star-delta combinations are the reliable solution for the staged startup of asynchronous machines. The starting current is reduced by one third compared to a delta startup. The required ramp-up time up to the rated speed in star startup can be set via a timing relay.

  • Reversing contactor assemblies

For safe and reliable changes in the direction of rotation of asynchronous motors, the pre-assembled SIRIUS reversing combinations from 3 kW to 55 kW (self-assembly kit from 3 kW to 250 kW) are available. They consist of two contactors of the same rating with an NC contact from 3 kW to 7.5 kW or an NO contact and an NC contact from 5.5 kW to 55 kW in the basic unit.

  • SIRIUS 3RT.4 contactors for weak or non-inductive loads (AC-1), 3-pole up to 2 650 A
  • SIRIUS 3RT.3 contactors, 4-pole, up to 525 A
  • SIRIUS 3RT25 contactors, 4-pole, 2 NO + 2 NC
  • SIRIUS 3RT26 contactors for capacitive loads (AC-6b), 3-pole
  • 3TK1 contactors for resistive loads (AC-1), 4-pole
  • Contactors for railway applications
  • 3TC contactors for switching DC voltage, 1-pole, and 2-pole.

Contactor relays are switching devices for control and auxiliary circuits and are used for controlling, signaling and locking switching devices and switchgear.

Naturally, SIRIUS 3RH2 contactor relays come with standard-compliant connection designations and a connection system that saves both time and installation overhead. This makes them particularly suitable for practical applications. 3RH2 contactor relays and size S00 motor contactors are the same size and have an identical design – a significant advantage, particularly regarding the accessories.

They are designed for AC or DC operation and are available with screw or spring-loaded terminals. The basic version of the contactor relays is a 4‑pole design which can be extended up to eight poles by means of Snap-On auxiliary switches.

Soft starters and solid-state switching devices

Due to its exceptional functionality, the intelligent SIRIUS 3RW55 soft starter can solve even the most difficult starting and stopping tasks simply and particularly gently. Integrated smart functions (for example, pump cleaning, pump stopping, automatic parameterization, condition monitoring) help operators to run their pumps smoothly. Thanks to the SIRIUS 3RW55 Failsafe soft starters with integrated Safe Torque Off (STO) functionality, safety-related applications can also be realized.

  • Three-phase controlled for optimal motor start.
  • Integrated, safety-related shutdown for SIL 1/PL c and SIL 3/PL e (with STO)
  • ATEX/IECEx-certified for use in hazardous areas.
  • Engineering in the TIA Portal
  • A wide range of communications interfaces (PROFINET, PROFIBUS, Ethernet/IP, Modbus)
  • Direct communication into cloud-based solutions via OPC UA
  • Motor control and diagnostic data via a standard web browser without additional software
  • Integrated HMI (Human-Machine-Interface) with color display
  • Media redundancy for reliable network availability
  • Integration in the process control system PCS 7 V9.0 SP2 with the 3RW5 block library

The SIRIUS 3RW52 soft starter is an ideal alternative to star-delta starters. As an all-rounder, it covers all drive types.

  • Three-phase controlled for optimal motor start.
  • Parameterization with rotary potentiometer
  • A wide range of communications interfaces (PROFINET, PROFIBUS, Ethernet/IP, Modbus)
  • HMI (Human-Machine-Interface) with display optional
  • Engineering in the TIA Portal
  • Integration in the process control system PCS 7 V9.0 SP2 with the 3RW5 block library

Thanks to their compact design, SIRIUS 3RW30/40/50 soft starters are the ideal solution for all standard applications.

  • Two-phase controlled for standard applications
  • Parameterization with rotary potentiometer
  • Optional communications interface (PROFINET, PROFIBUS, Ethernet/ IP, Modbus)
  • Visualization of motor data via optional HMI or analog output
  • Integrated motor overload and intrinsic device protection
  • Engineering in the TIA Portal
  • ATEX/IECEx-certified for use in hazardous areas.

The SIRIUS 3RF2 solid-state switching devices reliably switch a wide range of different loads with alternating voltages in 50 and 60 Hz systems.

SIRIUS 3RF2 solid-state switching devices for resistive/inductive loads:

  • Solid-state relays
  • Solid-state contactors
  • Function modules

SIRIUS 3RF2 – for almost unending activity

Conventional electromechanical switchgear is often overtaxed by the rise in the number of switching operations. A high switching frequency results in frequent failure and short replacement cycles. However, this does not have to be the case, because with the latest generation of our SIRIUS 3RF2 solid-state switching devices we provide you with solid-state relays and contactors with a particularly long endurance – for almost unending activity even under the toughest conditions and under high mechanical loading, but also in noise-sensitive areas.

Proven time and again in service

SIRIUS 3RF2 solid-state switching devices have firmly established themselves in industrial applications. They are used above all in applications where loads are switched frequently – mainly with resistive load controllers, with the control of electrical heat or the control of valves and motors in conveyor systems. In addition to its use in areas with high switching frequencies, their silent switching means that SIRIUS is also ideally suited for use in noise-sensitive areas, such as offices or hospitals.

The most reliable solution for any application

Compared to mechanical switchgear, our SIRIUS 3RF2 solid-state switching devices stand out due to their considerably longer service life. Thanks to the high product quality, their switching is extremely precise, reliable and, above all, insusceptible to faults. With its variable connection methods and a wide spread of control voltages, the SIRIUS 3RF2 family is universally applicable. Depending on the individual requirements of the application, our modular switchgear can also be quite easily expanded by the addition of standardized function modules.

Protection equipment

The availability of machines and plants is a precondition for maximum productivity. Machines and plants should therefore be reliably protected against overload from the power supply system. In the event of a failure, motor starter protectors quickly disconnect the equipment from the supply, thus preventing expensive damage. The SIRIUS 3RV2 motor starter protector provides ideal protection.

Motor starter protectors/circuit breakers

The SIRIUS 3RV2 motor starter protectors/circuit breakers are compact, current limiting motor starter protectors/circuit breakers which are optimized for load feeders. The motor starter protectors/circuit breakers are used for switching and protecting three-phase motors of up to 55/45 kW at 400 V AC and for other loads with rated currents of up to 100 A.

SIRIUS 3RV2 motor starter protectors reliably intervene in three different cases. In the event of a short-circuit – current >13 times the rated current – the short-circuit releases isolate the faulty load feeder from the power supply within only a few milliseconds. Greater damage, caused by fires for example, can thus be avoided. The motor starter protector features a lockable operating mechanism for manual closing/opening, to be used for example while carrying out repairs.

The 3RV motor starter protectors/circuit breakers can be used:

  • For short-circuit protection
  • For motor protection (also with overload relay function)
  • For system protection
  • For short-circuit protection for starter combinations
  • For transformer protection
  • As main and EMERGENCY OFF switches
  • For operation in IT systems (IT networks)
  • In hazardous areas (ATEX, IECEx)
  • As circuit breakers according to UL 489 (3RV27 and 3RV28)
  • For fuse monitoring
  • For distance protection

The overload release isolates the load from the power supply if it is loaded with an overcurrent for a certain time. Tripping is based on a specific time-current characteristic. This prevents possible damage to the load and the system. The overload release also trips in the event of phase failure or extreme phase unbalance.

Monitoring and control devices

SIRIUS Monitor for monitoring and responding.

SIRIUS Monitor solutions offer comprehensive protective, monitoring, and control functions for motors: for example, for pumps, fans, and compressors. Detailed operational, service, and diagnostic data support digitalization and ensure maximum plant availability and efficiency.

SIMOCODE pro is the flexible and modular motor management system for low-voltage motors. It can be connected easily and directly to your automation system via PROFIBUS DP, PROFINET/OPC UA, Modbus RTU or Ethernet/IP. It covers all functional requirements between the motor feeder and the automation system – including the safety-related disconnection of motors – and combines in just one compact system all required protection, monitoring, safety, and control functions. Thus, process control quality is increased while reducing costs at the same time – from planning through installation to operation or maintenance of a plant or system.

  • Save time, space, and money.
  • Discover the simplicity of the system, thanks to fewer components for all required functions.
  • Protect your flexibility with the aid of optional expansion modules.
  • Gain transparency throughout your system with extensive data provision.

SIRIUS Relays – One Range for Every Application

The portfolio of SIRIUS relays offers all components required for motor feeder applications from a single source. Whether you require compact timing or reliable monitoring relays, particularly narrow coupling relays, plug-in relays, low-noise power relays or signal converters – our relay range is the most complete and comprehensive portfolio on the market.

  • Suitable for every case
  • User-friendly
  • Multi-functional
  • Geared to the needs of practice.
  • Open communication with the controller
  • Outstanding price-performance ratio.

Electronic timing relays are used in control, starting, and protective circuits for all switching operations involving time delays.

Their fully developed concept and space-saving, compact design make the SIRIUS 3RP timing relays ideal timer modules for control cabinet, switchgear, and control manufacturers in the industry.

With their narrow design, the 7PV15 timing relays are ideal for use in heating, ventilation and air-conditioning systems and in compressors. All 7PV15 timing relays in this enclosure version are suitable for Snap-On mounting on TH 35 DIN rails according to IEC 60175. The enclosure complies with DIN 43880.

The SIRIUS 3RA28 function modules enable the assembly of starters and contactor assemblies for direct-on-line and star-delta (wye-delta) starting. They include the key control functions required for the feeder, e.g. timing and electrical interlocking. The function modules that function as timing relays are mounted quickly and simply on SIRIUS contactors – without any great wiring effort.

The SIRIUS 3RA28 solid-state time-delay auxiliary switches which can be mounted on contactors are designed for contactor coil voltages in the range from 24 to 240 V AC/DC (wide voltage range). Auxiliary switches for control and alarm signals are used specially for switching the smallest signals for electronics applications. They are used, for example, for allowing a pump or fan to run on, or for the delayed activation of a gate drive.

Simply by being plugged in place, the SIRIUS 3RT19 timing relays enable different functionalities required for the assembly of starters to be realized in the feeder. At the same time the timing relays for mounting on contactors reduce the wiring work required within the feeder and save space in the control cabinet.

Timing relays with ON delay

  • Interference pulse suppression (gating of interference pulses)
  • Gradual startup of motors so as not to overload the mains.

Timing relays with OFF delay

  • Generation of overtravel functions following removal of voltage
  • Gradual, delayed shutdown, e. g. of motors or fans, to allow a plant to be shut down selectively.

Clock-pulse relay

  • Flashing, asymmetrical

Wye-delta timing relay

  • Switchover of motors from Wye to delta with a dead interval of 50ms to prevent phase-to-phase short circuits.

Multifunctional timing relays

  • Maximum flexibility, with a device for every application
  • Available with relay and semiconductor outputs
  • Versions for railway applications for more exacting requirements (e.g. temperature range, vibration/shock resistance and EMC)

Watchdog function

Monitoring of cyclic events

SIRIUS monitoring relays provide reliable protection for machines and plants. Current measured values or conclusive diagnostics messages are indicated on the device display. For easy connection to the controller, most monitoring relays are also available with an IO-Link interface.

The new SIRIUS monitoring relays provide the easiest way to monitor network stability and quality.

They detect power system and voltage faults at an early stage and react. In this way, they ensure smooth operation. IO-Link communication enables transmission to the controller or cloud solution.


  • For line and DC load monitoring


  • Monitoring of line, current, voltage, power factor and active current, residual current, insulation, level, and speed


  • For direct mounting on contactors for multi-phase current monitoring


  • Protection against overheating in windings.


  • Temperature monitoring

Protection, Measuring and Monitoring Device

Flexible in its range of applications

Whether industrial applications, infrastructure, or buildings, with the SENTRON family you always have the right device. The components match perfectly. The modular design makes planning as well as configuration for the low-voltage power distribution easy and fast. The maintenance or retrofit is quite simple with the SENTRON product range and comprehensive, modular accessories.

3WA Air Circuit Breakers

The 3WA air circuit breakers are used as incoming feeders, tie, and outgoing feeder circuit breakers in electrical installations in industry, buildings, and infrastructure applications.

They reliably protect electrical systems and machines from damage and, thanks to their robust design, outstanding quality, and intelligent protective functions, prevent system downtimes, high downtimes, and their consequential costs. Thanks to modular communication options, they can be integrated into electronic control, maintenance, and energy management systems.

With three sizes for AC applications and one size for DC applications, 3WA air circuit breakers cover a power range from 630 A to 6,300 A. They are available in 3 and 4 pole versions. Simple and interactive selection aids as well as function packages ensure significantly reduced complexity in planning and selection. Based on the current IEC 60947-1/-2 standards, the 3WA can be used worldwide

Molded case circuit breakers

Requirements are increasing for cost-effective and energy-efficient operation of the electrical power distribution. Whether in industrial applications, buildings, or infrastructure: As a modular, highly variable system, the range of 3VA molded case circuit breakers provides thoroughly reliable operator and plant protection while supporting every process phase – from planning to the operation of electrical power distribution. Global use thanks to IEC and UL approval.

  • Modular, well-conceived, and highly variable system
  • High system availability thanks to an excellent selectivity concept
  • Integrated measured value acquisition.
  • Simple integration into higher-level energy management and automation systems
  • Comprehensive range of accessories for flexible function expansions
  • Minimal space requirements thanks to a highly compact design
  • Optimal support in all tasks of a modern power distribution – in every phase of the engineering processes, e.g. by providing CAx data.
  • Condition monitoring based on forecast remaining service life and the health indicator.
  • Front-mounted motor operator with stored energy feature SEO520 for SENTRON 3VA1 molded case circuit breaker up to 400 A and 3VA2 up to 630 A (IEC) as well as 3VA5 up to 400 A and 3VA6 up to 600 A (UL)
  • Complete SENTRON molded case circuit breaker portfolio up to 1,600 A (IEC/UL) and 2,000 A (UL)

Miniature circuit breakers

Protecting electrical installations from damage

The number of electrical loads is constantly increasing, which places an ever-greater load on the electrical installation. In the event of an overload or short-circuit, miniature circuit breakers safely cut off the connected circuit and reliably protect electrical installations and equipment from damage. Miniature circuit breakers from the SENTRON portfolio are also simple to mount and install. The devices have a uniform design and, with the appropriate accessories, can be expanded by many additional functions. For industry, buildings, or infrastructure – with our versatile portfolio, you will find a suitable miniature circuit breaker for any application.

MCBs from the SENTRON portfolio meet the enhanced requirements of automated buildings and industrial power supply systems, e.g. in the automotive and semiconductor industry or in data centers. Compared to residential and functional buildings, these are usually more extensive and complex in terms of both network topology and operation. Electricity and production downtimes must be deliberately prevented in these cases using coordinated device combinations if economic losses are to be avoided. Our MCBs protect wires and cables in cases of short circuit and overloads and enable backup protection for switching devices and semiconductor protection. They are therefore a fundamental component in end-to-end protection concepts for industry and infrastructure.

Residual Current Protective Devices

More safety for humans, plants, and assets

The number of electrical consumers in residential homes and commercial buildings has increased dramatically in recent decades.

Modern appliances often have quite different characteristics in terms of current consumption than earlier equipment due, for example, to the use of frequency converters in washing machines, or switched-mode power supply units in TVs, PCs, or LED lights.

There are also decentralized power generators like photovoltaic systems or charging devices for electric vehicles.

All of this requires new protection strategies for electrical installations. This also includes appropriate residual current protection devices or residual current circuit breakers that will cut the current immediately and safely in the event of a fault.

Overvoltage Protection Devices

Millions of lightning strikes in the world every year pose a considerable risk for buildings and systems that can be damaged due to the unhindered effect of lightning currents, overvoltage, and power surges. In many cases however, it is not apparent that such damage has been caused by lightning currents, overvoltage, and power surges.

Overvoltage results in considerable damage to electrical and electronic equipment. Even brief transients in power supply lines or between electrical lines and other conductive parts (e.g. grounded metallic parts, ground) are sufficient to cause such damage. The damage patterns of destroyed lines, circuit boards or switchgear demonstrate this. Such damage can be prevented by employing suitable overvoltage protection means.

Fuse Systems

Mandatory basic protection in electrical installations

Overcurrent in electrical installations occurs because of excessive load or short-circuits and can cause serious accidents, fires, and financial damage. Appropriate protection devices have therefore been mandatory ever since electricity was first harnessed to power equipment. As a pioneer in fuse systems, we offer you the complete range of devices for the protection of cables as well as electrical devices and installations in the event of overloads and short- circuits.

Fuses are capable of safely switching off circuits as soon as an overload or short-circuit occurs. This prevents damage to electrical equipment or extended power failures. Specific variants of fuse systems are used for different applications.

Among other things, our fuses are used for protecting cables and lines, switching devices and semiconductors as well as in photovoltaics and wind power.

Wide range of SENTRON fuse system includes.

  1. SENTRON NEOZED Fuse Systems
  2. SENTRON Cylindrical Fuse Systems
  3. SENTRON UL Fuse Systems
  4. SENTRON Busbar Systems
  5. SENTRON 3NA, 3ND LV HRC Fuse Systems
  6. SENTRON SITOR Semiconductor Fuses
  7. SENTRON Photovoltaic Fuses

Switch Disconnectors and Transfer Switching Equipment

For a continuous supply of power

A power failure can have serious consequences: To the greatest extent possible, an uninterruptible power supply must be ensured to prevent failure or outage of electrical installations. Transfer switching equipment from Siemens switches between two power sources, therefore providing a nearly continuous supply of power.

The devices are easy to install and can be quickly put into operation. Additional functions can also be easily added – thanks to the modular design of the devices and to their wide scope of available accessories.

Convenient ordering processes and fast delivery optimize stock keeping and save you time and money. You can also use our CAx data for automated and streamlined planning and configuration.

Measuring Devices and Power Monitoring

Energy savings begin with SENTRON measuring devices.

You can only improve what you can measure. That’s why the first step toward energy savings is data acquisition. SENTRON measuring devices record consumption extremely reliably and help to identify energy wastage. The extensive portfolio includes devices for every need, from DIN rails to front panels and Modbus to PROFINET. Measuring is our passion and energy savings are our mission.

SENTRON measuring devices …


  • Energy meters
  • Multifunction measuring devices.
  • Meters to measure network quality.
  • Multichannel current measuring systems

… are usable for:

  • Infrastructure
  • Building management
  • Manufacturing plants
  • EV charging stations and renewable energies.

… measure:

  • (Active) energy
  • Power factor, cosφ
  • THD value (harmonics)
  • Power quality according to EN50160.

… offer you:

  • (More transparency
  • More efficiency
  • More reliability
  • More sustainability
  • Recharging costs to third parties.

Software for low-voltage power distribution

SENTRON Digital – transparency made real in low-voltage power distribution.

Thanks to end-to-end data-based communication, our smart software solutions and applications for low-voltage power distribution ensure efficient, reliable, and sustainable power distribution – from planning and commissioning to targeted energy and condition monitoring during operation.

  1. SENTRON Powercenter 3000

An easy introduction to efficient power and condition monitoring on the low-voltage level, locally on site via a web interface in the corporate network.

  1. SENTRON Powermind

Efficient power and condition monitoring on the low-voltage level via a cloud app – flexible, location-independent, for one or more properties.

  1. SENTRON Powermanager

Transparent, efficient, and reliable: PC-based power and condition monitoring for the low-voltage level with the expert solution for large-scale applications.

  1. SIMARIS Configuration

The SIMARIS configuration software supports a fully digital engineering process so you can design distribution systems easily and consistently.

  1. SIMARIS Busbarplan

The SIMARIS Busbarplan software, which is available as plug-in for Autodesk Revit, supports the 3D-planning of SIVACON 8PS busbar trunking systems in the context of BIM (building information modeling).

Product Information

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