ABB 1SNA645014R2700 RB111-24VUC R600 Interface Relay

ABB 1SNA645014R2700 is the order number for the RB111-24VUC boxed interface relay in the ABB R600 series. This compact relay is designed for electrical interface and switching applications in industrial control systems. The device uses a 24 V AC/DC control supply and provides one normally open output contact for switching a connected circuit.

The R600 interface relay architecture provides a practical connection between a control-side circuit and an output circuit. The ABB 1SNA645014R2700 configuration combines a compact 6 mm housing with screw terminal connections, a built-in LED and a silver-tin-oxide contact. ABB product documentation identifies the device as a boxed interface relay and lists its output circuit for 5 to 250 V AC with a load range of 60 mA to 6 A.

Product Identification

• Manufacturer: ABB
• Product Series: R600
• Product Type: Boxed Interface Relay
• Type: RB111-24VUC
• ABB Order Number: 1SNA645014R2700
• Control Supply: 24 V AC/DC
• Output Contact: 1 normally open contact
• Output Voltage Range: 5 to 250 V AC
• Output Current Range: 60 mA to 6 A
• Terminal Type: Screw terminals
• Contact Material: Silver-tin-oxide (AgSnO2)
• Status Indication: Built-in LED
• Product Width: 6 mm
• Product Height: 67.5 mm
• Product Depth: 70 mm

ABB R600 Interface Relay

The ABB R600 series is a family of interface relays developed for switching and interface functions within electrical control systems. Interface relays are commonly positioned between control electronics and external circuits, allowing a low-power control signal to operate an electrically separate output circuit.

The RB111-24VUC is one of the compact configurations within this product family. Its 24 V AC/DC control supply allows it to be integrated into control systems using either alternating or direct current at the specified control voltage.

The single normally open output contact provides a straightforward switching function for connected equipment or control circuits.

24 V AC/DC Control Supply

One of the primary identification characteristics of ABB 1SNA645014R2700 is its 24 V AC/DC control supply. The RB111-24VUC designation corresponds to the 24 V universal control-supply configuration listed by ABB.

The control circuit energizes the relay when the required control voltage is applied. The relay then changes the state of its output contact, allowing the connected circuit to be switched according to the control signal.

Using a 24 V control circuit is common in industrial automation because this voltage level is widely used in control panels, PLC interface circuits and industrial instrumentation.

One Normally Open Contact

The ABB RB111-24VUC provides one normally open output contact. A normally open contact remains open in its normal, de-energized state and closes when the relay coil is energized.

This configuration is suitable for straightforward switching functions where a control signal needs to activate a separate output circuit. Typical control logic can include equipment enable signals, interlocking circuits, indication circuits and interface functions.

Because the device provides a single normally open contact, its application should be evaluated according to the required number of switching poles and the electrical characteristics of the connected circuit.

Output Switching Capability

ABB specifies the output signal of the 1SNA645014R2700 as 5 to 250 V AC with a current range of 60 mA to 6 A. These values describe the specified output switching capability of the relay.

The actual suitability of the relay for a particular load depends on the load type, switching frequency, voltage, current and applicable electrical conditions. Resistive and inductive loads can impose different demands on relay contacts.

For engineering purposes, the relay should therefore be selected according to the actual load characteristics rather than relying only on the maximum nominal current.

Silver-Tin-Oxide Contact Material

The output contact of ABB 1SNA645014R2700 uses silver-tin-oxide, abbreviated AgSnO2. Contact material is an important part of relay design because it influences the electrical switching characteristics of the contact system.

Silver-tin-oxide contacts are used in electrical switching applications where suitable contact performance is required under defined operating conditions. The material specification provides an additional identification characteristic for the RB111-24VUC.

Built-In LED Indication

The RB111-24VUC includes a built-in LED according to ABB’s product specification. The LED provides a visual indication associated with the relay’s control condition.

Visual status indication can simplify panel inspection because technicians can identify the relay’s energized state without relying exclusively on electrical measurements. This is particularly useful when multiple interface relays are installed next to each other in a control cabinet.

The LED is part of the relay’s interface design and complements the electrical switching function.

Compact 6 mm Housing

The ABB 1SNA645014R2700 has a product width of 6 mm. The narrow housing allows multiple relay channels to be arranged within a relatively small control-panel space.

Compact interface modules are useful in industrial automation cabinets where DIN-rail space and wiring density are important considerations. The 6 mm width also allows individual relay channels to be organized in a structured row while maintaining access to the associated terminals.

The documented product dimensions are approximately 6 mm wide, 67.5 mm high and 70 mm deep.

Screw Terminal Connection

ABB specifies screw terminals for the RB111-24VUC. Screw terminals provide a conventional electrical connection method for control and output wiring.

The terminal arrangement should be wired according to the applicable ABB documentation and the electrical schematic of the control system. Correct identification of the control-side and output-side terminals is essential when integrating the relay into an automation cabinet.

The screw-terminal design also allows the relay to be incorporated into conventional industrial control-panel wiring systems.

Interface Between Control and Load Circuits

An interface relay can provide a practical electrical separation between a control signal and a switched circuit. In an automation system, a PLC output or other control device can energize the relay while the relay’s contact operates the connected output circuit.

This arrangement can help adapt the electrical characteristics of different parts of a control system. It also provides a replaceable switching interface between control electronics and field wiring.

The ABB RB111-24VUC is therefore useful where a 24 V AC/DC control signal needs to operate a single normally open output contact.

R600 Series Configuration

ABB’s R600 catalog includes several relay configurations with different control voltages, contact arrangements and output characteristics. The 1SNA645014R2700 is specifically listed as RB111-24VUC.

Other R600 models use different control voltages or contact arrangements, so the complete order number is important when identifying the correct relay. A similar-looking R600 relay may have a different coil voltage or switching configuration.

For technical records, the ABB order number and type designation should be stored together.

Technical Specification Table

Industrial Control Applications

The ABB 1SNA645014R2700 can be incorporated into industrial control systems where relay-based switching is required. Its compact architecture makes it suitable for control cabinets, interface panels and electrical automation assemblies.

Potential functions include switching control signals, interfacing PLC outputs with external circuits, equipment status control and electrical interlocking. The actual application must be evaluated against the relay’s contact ratings and the characteristics of the connected circuit.

The relay should not be treated as a universal load-switching device because the permissible switching conditions depend on the electrical characteristics of the load.

Panel Integration

The narrow housing of the RB111-24VUC is advantageous in applications with high control-panel component density. A 6 mm module can reduce the amount of horizontal mounting space required for individual relay channels.

This can be particularly useful in systems containing a large number of discrete interface signals. Individual relay identification and orderly terminal wiring remain important for maintenance and troubleshooting.

The relay’s physical dimensions should be considered together with the mounting system and adjacent components when designing or modifying a control panel.

Electrical Selection

Selecting the ABB 1SNA645014R2700 requires confirmation of both the control-side voltage and the output-side requirements. The control circuit must provide the specified 24 V AC/DC supply, while the switched circuit must remain within the relay’s applicable output ratings.

The load type should also be considered. Motor, solenoid and other inductive loads can generate electrical conditions that differ from those of purely resistive loads.

Where additional suppression or protection is required, it should be designed according to the electrical characteristics of the complete circuit.

Maintenance Considerations

Maintenance of an interface relay can include checking the control voltage, LED indication, terminal connections and output contact behavior. If the expected switching action does not occur, troubleshooting should begin by confirming that the correct control voltage reaches the relay.

The output circuit should then be checked for continuity and correct wiring. If the control signal is present but the output contact does not change state as expected, the relay may require further inspection.

Loose terminal connections, incorrect wiring and unsuitable load conditions can also cause switching problems, so the entire circuit should be evaluated systematically.

Documentation and Identification

For equipment databases, the recommended identification is “ABB 1SNA645014R2700 — RB111-24VUC R600 Boxed Interface Relay.”

The complete order number is important because ABB’s R600 series contains multiple relay configurations with different control voltages and contact arrangements. Recording the type designation together with the order number provides an additional level of identification.

This information can be used in electrical drawings, control-panel documentation, maintenance databases and component lists.

Compatibility Considerations

Compatibility should be evaluated using the complete ABB order number rather than physical appearance alone. The 1SNA645014R2700 is specifically associated with the RB111-24VUC configuration and a 24 V AC/DC control supply.

A relay with the same housing dimensions but a different control voltage may not be electrically interchangeable. Likewise, different contact arrangements can change the function of the circuit.

For replacement or engineering work, the control voltage, contact configuration, output load and terminal arrangement should all be checked.

Technical Role in Automation Systems

Interface relays provide a simple but important function in industrial automation. They allow control signals to operate separate electrical circuits while providing a defined switching interface.

The ABB RB111-24VUC combines this function with a compact housing, one normally open contact and a built-in LED. These characteristics make the device suitable for discrete control applications where individual relay channels need to be clearly identified and efficiently arranged.

Its 24 V AC/DC control supply also allows it to operate in control systems using either AC or DC at the specified voltage.

Conclusion

ABB 1SNA645014R2700 is the ABB RB111-24VUC boxed interface relay from the R600 series. ABB identifies it with a 24 V AC/DC rated control supply, one normally open output contact, screw terminals and a built-in LED. The output circuit is specified for 5 to 250 V AC and 60 mA to 6 A, with silver-tin-oxide contact material. :contentReference[oaicite:1]{index=1}

Its compact 6 mm width makes the relay suitable for dense industrial control-panel arrangements, while the single normally open contact provides a straightforward switching interface between a control signal and a connected circuit. The complete ABB order number should be retained in technical records because the R600 series includes multiple configurations with different control voltages and contact arrangements.

For engineering and maintenance purposes, ABB 1SNA645014R2700 should be identified as “RB111-24VUC R600 Boxed Interface Relay” and evaluated according to its 24 V AC/DC control requirement, output contact configuration, electrical load characteristics and installation arrangement. This provides a clear technical basis for integrating the relay into industrial automation and electrical control systems.