Operator Interfaces, Switches & Relays

New generation of low voltage control gear

April 2000 Operator Interfaces, Switches & Relays

Sirius 3R is a new generation of low-voltage control-gear from Siemens Automation & Drives, making it possible to create all load feeders solely from standard devices. This state-of-the-art modular system consists of circuit breakers, contactors, overload relays (thermal and electronic), softstarters, thermistor relays and timers, together with mounting and connecting accessories.

All device groups of this switchgear family are optimally matched mechanically and electrically so as to enable users ease of installation and stocking. The devices require very little mounting space in a switchgear cubicle.

The entire modular system has four sizes up to 45 kW and in three widths – 45, 55 and 70 mm. It meets all requirements of switchgear used both for switching motors and for control circuits.

Circuit breakers for rated currents up to 100 A are short-circuit-proof to 50/100 kA at 400 V a.c. Common auxiliary switches can be fitted laterally or diagonally. All Sirius R3 circuit breakers are lockable in off position and provide a clear on, off or tripped indication. The setting ranges are unrestricted up to an ambient temperature of 60°C.

The power contactors have been designed for switching motors up to 45 kW at 400 V a.c. All contactors can be snapped onto a DIN rail and extended by auxiliary switches fitted on the front or the sides. There is no wiring because limiter blocks, such as diodes, RC snubber circuits or varistors, are snapped on. Contactors over 5,5 kW come with a four-leg coil enabling connections from the top, bottom or diagonally.

The contactor relays have the same physical dimensions as the smallest power contactor. Thanks to their high contact reliability they are particularly suited to work with programmable logic controllers.

The thermal overload and electronic overload relays also excel with good long-term stability and the same setting ranges as the 3RV circuit breakers. A uniform tripping block up to 100 A and an electric remote reset for all sizes ensure a clear layout of control elements across all relays. Butt-mounted and up to 60°C, the overload relay does not need de-rating. It has an integrated transparent and sealable cover for setting knob and test functions. Contactors can be fitted directly onto these overload relays because they have the same width. However, it is also available with a standalone module.

The 3RW Softstarter complements the Sirius range by being able to provide the range with an electronic softstarter capable of softstart and softstop, including a by-pass function. The units are available in the same sizes as the circuit breakers, contactors and overloads.

The 3RP timers complete the new switchgear family. They are available in 45 mm contactor size as well as in the compact, standard 22,5 mm design. The making and breaking capacity of the 3RP has been tested according to IEC 947-5-1 and is a 3 A for 115 to 230 V a.c. and 1 A from 13 to 24 V d.c. The timers with selectable time ranges from 0,05 s to 100 h run on noise-immune and surge-proof electronics. They function as on-delays or multi-functional time-delay relays with 16 functions and a wide voltage range from 24 to 240 V a.c./d.c.

SiriusNET allows the range the capability of communicating via ASI-bus or Profibus. The Sirius components have been incorporated into an intelligent combination capable of communicating with a PLC.


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Siemens guides Tiger Brands along its digitalisation journey
Siemens South Africa System Integration & Control Systems Design
The project involved upgrading the legacy plant control system with the implementation of a combined Siemens WINCC scada and PM-addons along with the associated network and control equipment that included communication converters, PLCs, VSDs and ASI modules for various process areas.

Siemens extends Xcelerator portfolio
Siemens South Africa IT in Manufacturing
Siemens Digital Industries has announced the release of NX Automation Designer software and NX Industrial Electrical Design software, a new suite of solutions that provide a central design application for industrial, electrical and automation design.

Totally Integrated Automation – added value in three dimensions
Siemens South Africa Editor's Choice System Integration & Control Systems Design
Discover everything that’s in TIA, the leading automation concept from Siemens, and how it all works together to create a unique product for machine builders and industrial enterprises.

The brewery of the future
Siemens South Africa Process Dynamics System Integration & Control Systems Design
Meeting current and future customer requirements quickly and with the highest quality is key to the food and beverage industry.

Siemens’ software for digital transformation of automotive design
Siemens South Africa IT in Manufacturing
Model-based development process and systems are used in Japan and globally to adapt to the biggest automotive transformation in 100 years.

E-stops with protective shrouds
Turck Banner Operator Interfaces, Switches & Relays
Turck Banner now offers variations of its popular emergency stop controls with a durable protective shroud. The shroud has a sturdy one-piece design that ensures safe and consistent operation for the ...

Siemens gateway for the process industry
Siemens South Africa Fieldbus & Industrial Networking
Siemens has introduced the Sitrans CloudConnect 240: a new gateway for the process industry. It provides a second data channel, that is used to transmit data from any HART-based field devices to the IT world.

Siemens drives digital transformation at virtual Smart Mining forum
Siemens South Africa IT in Manufacturing
With its motto: ‘On the road to the digital future’, Siemens hosted its virtual Smart Mining forum from 3-5 August.

High output LED strip light
Turck Banner Operator Interfaces, Switches & Relays
Increase worker productivity and ergonomics with bright, high-quality, uniform light.

Siemens to focus on sustainability
Siemens South Africa News
As part of its recent virtual capital market day, entitled ‘Accelerating High Value Growth’, Siemens presented its new growth strategy that includes a comprehensive sustainability agenda.