Product Overview

ABB 2TLA010026R0000 is an RT6 24DC safety relay from the ABB Jokab Safety product range. It is designed to monitor safety-related circuits in industrial machinery and automation systems where the controlled equipment must respond appropriately to safety devices. The relay operates with a 24 V DC control supply and provides three safety outputs together with an NC information output.

The RT6 safety relay is intended as a dedicated interface between safety devices and machine control circuits. It can monitor signals from devices such as emergency stops, safety interlocking switches, safety gates, light curtains, light beams, safety mats, contact strips, enabling devices, foot controls, and other safety-related inputs. By processing the safety circuit, the relay can control the connected safety outputs when the required safety conditions are fulfilled.

The complete product reference 2TLA010026R0000 identifies the 24 V DC version of the RT6 safety relay. ABB documentation lists the product as RT6 24DC and describes it as a universal safety relay suitable for several safety applications. The relay belongs to the ABB Jokab Safety family of machine safety products and was developed for applications requiring monitoring of safety-related circuits.

Safety Relay Function

A safety relay is used to supervise signals from safety devices and control safety-related outputs. Unlike a conventional control relay, a safety relay is designed specifically for safety functions and incorporates monitoring arrangements intended to identify certain faults within the safety circuit. The RT6 provides a structured interface between field safety devices and machine control components.

ABB 2TLA010026R0000 provides three normally open safety outputs and one normally closed information output. The safety outputs are used within the machine safety circuit, while the information output can provide additional status information for the control architecture. The exact circuit arrangement should be designed according to the applicable safety requirements and the documentation for the complete machine.

The RT6 supports both single-channel and dual-channel safety input configurations. The selectable input arrangements allow the same safety relay family to be used with different types of safety devices and circuit architectures. This flexibility is one of the characteristics that makes the RT6 suitable for a variety of industrial machine safety applications.

24 V DC Control Supply

The 2TLA010026R0000 version is designed for a rated control supply voltage of 24 V DC. A 24 V DC control voltage is widely used in industrial automation systems because it is compatible with many control panels, sensors, PLC interfaces, contactors, and other low-voltage control components.

The control supply provides the operating power required by the safety relay. During system design, the available control voltage should be verified against the relay specification and the complete safety circuit. The power supply should also be designed so that the safety system maintains the required operating conditions under normal and fault situations.

The 24 V DC configuration should not be confused with other RT6 versions. ABB also documented RT6 variants using 24 V AC, 115 V AC, and 230 V AC control supplies. These versions have different ordering numbers, making the complete ABB part number essential for identifying the correct electrical configuration.

Selectable Safety Inputs

One of the important features of the RT6 is its selectable input configuration. ABB documentation describes five selectable input options supporting single-channel or dual-channel safety circuits. This allows the relay to interface with different safety devices without requiring a separate relay type for every basic input arrangement.

Dual-channel safety circuits can provide additional monitoring capability because two separate signal paths are evaluated by the safety system. Depending on the application, dual-channel inputs may be used with emergency stop devices, interlocking devices, light curtains, safety mats, and other safety components designed for two-channel operation.

The actual input arrangement must be selected according to the safety device, machine risk assessment, wiring architecture, and applicable standards. The relay itself should not be considered independently from the complete safety system because the achieved safety performance depends on the complete circuit and the connected components.

Supervised Reset Function

ABB 2TLA010026R0000 supports automatic reset as well as manual supervised reset. Reset behavior is an important part of machine safety because the restoration of a safety condition does not necessarily mean that the machine should immediately restart.

A supervised manual reset can require an operator action after the safety circuit has returned to its permitted state. This can help prevent unexpected restarting after an emergency stop, gate opening, or activation of another safety device. The appropriate reset method depends on the machine design and the applicable risk assessment.

When implementing a reset circuit, the reset device and its location should be considered carefully. The operator should have the necessary visibility and control required by the machine safety design. Reset behavior should be verified as part of the complete machine safety validation process.

External Contactor Monitoring

The RT6 includes a test input intended for monitoring external positive-guided relays or contactors. External contactor monitoring is an important function in safety control systems where the safety relay operates additional switching components that control hazardous machine functions.

The monitoring circuit can be used to verify the expected state of connected external switching components. This helps the safety circuit detect certain conditions in which an external contactor does not return to its expected state. The function therefore provides an additional monitoring layer between the safety relay and the controlled machine equipment.

The external monitoring arrangement should be implemented according to the RT6 application documentation and the characteristics of the connected contactors. The complete circuit must be evaluated as a safety function rather than treating the monitoring input as an independent general-purpose control signal.

Applications

ABB 2TLA010026R0000 can be used in a wide range of machine safety applications. ABB documentation identifies suitability for interlocking switches, gates and hatches, light curtains, light beams, safety mats, contact strips, emergency stops, hold-to-run and enabling devices, foot controls, area supervision, and output expansion.

In an emergency-stop circuit, the RT6 can monitor the emergency-stop signal and control the associated safety outputs. In a safety-gate application, it can supervise the interlocking device and prevent the relevant machine function from remaining enabled when the required safety condition is not satisfied.

Light curtains and light beams can also be integrated into suitable safety circuits. When a protective field is interrupted, the safety device changes its output state and the safety relay processes the corresponding input condition. The resulting safety output state can then be used within the machine control architecture.

Safety Outputs

The RT6 24DC provides three normally open safety outputs and one normally closed information output. The three safety outputs provide multiple switching contacts that can be incorporated into the safety-related control architecture.

Multiple safety outputs can be useful when a safety function must control more than one circuit. For example, different outputs may be connected to separate contactors or control paths associated with the machine’s hazardous movement or energy sources. The actual allocation of outputs should be determined by the machine’s safety design.

The NC information output provides an additional status signal that can be used within the control system where appropriate. Information outputs should be distinguished from safety outputs when designing the safety function, because a status signal does not automatically provide the same safety function as a designated safety output.

DIN Rail Installation

ABB 2TLA010026R0000 is designed for DIN rail mounting, making it suitable for installation inside industrial control cabinets and machine electrical panels. DIN rail mounting provides a standardized mechanical installation method and allows safety relays to be positioned alongside other control and protection devices.

The RT6 has a product width of approximately 45 mm. Its compact format allows it to be integrated into control panels where multiple safety and automation components are installed. The enclosure is specified with an IP20 rating, which is appropriate for suitable protected control-panel environments rather than exposed outdoor installations.

Electrical connections use screw terminals. During installation, wiring should be arranged according to the applicable circuit diagram, terminal designation, safety device configuration, and machine control requirements. Clear separation and identification of safety-related wiring can also assist future maintenance and inspection.

Safety Category and Machine Protection

ABB documentation identifies the RT6 as suitable for safety applications corresponding to safety categories 1 through 4 under the applicable safety architecture. The exact safety performance achieved by a machine cannot be determined from the relay alone. It depends on the complete safety circuit, connected devices, wiring, diagnostics, fault response, and overall system design.

Safety category selection should be based on a formal machine risk assessment. The required category depends on the hazards presented by the machine and the level of risk reduction required. The RT6 can serve as one component of an appropriately designed safety function.

When the relay is incorporated into a safety system, designers should consider the characteristics of every connected safety device and switching element. Proper circuit architecture and validation are essential for achieving the intended safety performance.

Technical Specifications

Maintenance and System Integration

Maintenance of an RT6 safety relay should be performed as part of the complete machine safety system. Inspection can include the condition of wiring, terminal connections, safety-device inputs, reset circuits, external contactor monitoring, and output behavior. Any maintenance activity should follow the procedures established for the specific machine.

Functional verification is particularly important for safety-related equipment. The complete safety function should be checked to confirm that activation of the associated safety device produces the intended machine response. Reset behavior and external contactor monitoring should also be evaluated where those functions are implemented.

For system integration, the complete part number 2TLA010026R0000 should be recorded in electrical drawings, equipment databases, and maintenance documentation. This helps distinguish the 24 V DC RT6 version from the other RT6 variants with different control supply voltages.

Product Identification

ABB 2TLA010026R0000 is identified as RT6 24DC Safety Relay. The product identification is important because ABB’s RT6 family includes multiple versions with different supply voltages. The R0000 suffix specifically corresponds to the 24 V DC version listed in ABB product documentation.

When identifying an installed unit, the complete product number should be checked together with the RT6 designation and the equipment documentation. Visual similarity between safety relay variants does not necessarily indicate electrical interchangeability, particularly when the control supply voltage differs.

The product reference can also be used when reviewing historical machine documentation or existing safety circuits. ABB has published conversion information for older safety relays showing that the RT6 24DC reference was subsequently associated with Sentry safety relay alternatives. This is relevant when evaluating an existing installation or planning a technical modernization.

Conclusion

ABB 2TLA010026R0000 is the RT6 24DC safety relay designed for safety-related machine and automation applications. It operates from a 24 V DC control supply and provides three normally open safety outputs and one normally closed information output. Its selectable input arrangements allow use with different single-channel and dual-channel safety circuits.

The RT6 supports automatic or manual supervised reset and includes a test input for monitoring external positive-guided relays or contactors. Its application range includes emergency-stop circuits, safety gates, interlocking devices, light curtains, light beams, safety mats, contact strips, enabling devices, foot controls, and area supervision.

With DIN rail mounting, screw-terminal connections, a compact 45 mm width, and an architecture intended for safety-related circuit monitoring, ABB 2TLA010026R0000 can be incorporated into suitable industrial machine control panels. The complete product number should be retained when identifying the unit because the RT6 family contains versions with different supply voltages and configurations.