3RT2027-1BB40-0CC0 SIEMENS

3RT2027-1BB40-0CC0 SIEMENS Basis unit

Product  Description：

A Siemens Basis unit, commonly referred to as a BaseUnit in the SIMATIC ET 200SP distributed I/O system, is a modular base component designed to host electronic I/O modules, motor starters, and technology modules. It acts as the physical and electrical backbone of the automation station, providing terminal connections for field wiring, internal communication buses, and self-assembling voltage distribution rails. This design allows for the pre-wiring of the control cabinet before electronic modules are installed, and it enables tool-less hot-swapping of modules during operation without disconnecting field cables.

Product Parameters

• Rated Operating Voltage: Up to 24 V DC for standard signal channels, and up to 240 V AC or 380 V DC for auxiliary or power distribution modules depending on the variant.

• Current Carrying Capacity: Typically supports up to 10 A continuous current for internal voltage supply and auxiliary power buses.

• Terminal Connection Types: Available in push-in (spring-loaded) terminal technology for fast, tool-free wiring, or classic screw terminal variants.

• Wire Cross-Section: Accommodates rigid and flexible conductors ranging from 0.14 mm squared up to 2.5 mm squared, with or without wire end ferrules.

• Mounting Method: Snap-on mounting onto standard 35 mm DIN rails in accordance with EN 60715.

• BaseUnit Variants: Classified by specific type codes such as Type A0, A1, B0, B1, C0, and D0, which dictate module compatibility, potential group formations, and auxiliary terminal setups.

• Operating Temperature Range: From -30°C up to +60°C for horizontal installation, or up to +50°C for vertical installation.

• Protection Class: IP20 protection degree, intended for installation inside standard control enclosures.

Key Product Advantages

• Permanent Wiring Technology: Field cables are wired directly into the BaseUnit once, allowing electronic modules to be replaced or maintained quickly without any rewiring errors.

• Self-Assembling Voltage Buses: Integrated internal potential and auxiliary buses automatically link adjacent BaseUnits together upon installation, drastically minimizing external jumper wiring.

• Color-Coded Terminals: Standardized terminal numbering and color coding per channel prevent wiring mistakes and simplify troubleshooting.

• Compact Footprint: High-density terminal arrangements save valuable control panel space while maintaining easy access for testing probes and diagnostic measurements.

• Tool-Free Installation: Push-in connection technology allows single-core or ferrulled wires to be inserted directly without tools, reducing panel assembly time.

Important Operational Considerations

• Module Compatibility: Ensure the correct BaseUnit type and color code match the specific I/O module being inserted to prevent mechanical damage or electrical miswiring.

• Current Limits: Do not exceed the maximum total current rating of the internal power and auxiliary buses when daisy-chaining multiple units together.

• Potential Group Management: Pay close attention to light-colored BaseUnits (which open a new independent potential group) versus dark-colored BaseUnits (which feed power from the left neighbor) during system design.

• Wire Preparation: Maintain the manufacturer-specified wire stripping length (typically 10 mm to 11 mm) for push-in terminals to guarantee secure and reliable electrical contact.

• Environmental Protection: Because BaseUnits carry an IP20 rating, ensure they are housed inside an appropriately rated enclosure to guard against moisture, dust, and corrosive vapors.

Industrial Applications

• Factory Automation: Integrated into high-speed manufacturing lines, assembly cells, and robotics to manage distributed signal acquisition and actuator control.

• Machine Building (OEM): Utilized by machine builders to standardize control panel layouts, reduce wiring complexity, and accelerate modular equipment assembly.

• Process Control: Deployed in chemical plants, pharmaceutical manufacturing, and energy management systems to connect field instrumentation securely.

• Building Management Systems: Applied in HVAC control panels and infrastructure automation cabinets for reliable, high-density I/O distribution.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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