2TLA010033R3000: BT51T expansion relay: timing, output allocation and safety-system checks
The ABB BT51T 24DC safety expansion relay uses order code 2TLA010033R3000. ABB product-family material identifies the BT51T as a time-delay relay with a 0–1.5 s delay range and 3NO/1NC outputs. Treat it as an expansion component for a compatible safety system, not as a stand-alone replacement for the logic or input-monitoring device.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| ABB order code | 2TLA010033R3000 |
| Product designation | BT51T 24DC |
| Device type | Safety relay / expansion relay |
| Supply | 24 V DC variant; verify exact connection diagram |
| Timing | Adjustable delay family; published BT51T range is 0–1.5 s |
| Outputs | 3NO / 1NC for the BT51T configuration |
| Application | Expansion of compatible safety-relay outputs |
Integration path
Treat 2TLA010033R3000 as one link in a defined system path. Trace the signal or power from its source, through this device, to the controller or final element, then verify feedback and abnormal-state behavior.
BT51T is relevant when a safety design needs additional, deliberately timed relay outputs and the governing safety architecture permits that arrangement. Review the sequence between the base safety relay, the expansion device and each final switching element. A delay is a safety-function parameter, not merely a convenience setting.
Selection and compatibility checks
For 2TLA010033R3000, verify the exact delay behavior, reset conditions, input trigger, output contacts and compatibility with the host relay. Confirm that the selected delay cannot undermine the required stopping time or guard-interlock strategy. Use only the output contact arrangement documented for the BT51T version; related BT-family versions may have different output and timing characteristics.
For 2TLA010033R3000, establish the equipment boundary before procurement: record the host controller or panel, the connected field device, the installed hardware and firmware revisions, the supply source, the protection method and the required operating sequence. A family-name match is not enough to confirm that 2TLA010033R3000 is a compatible replacement. Check all interfaces and accessories against the exact ABB documentation.
Commissioning and acceptance
Commission the BT51T with the machine isolated from hazardous motion. Measure the actual delay, verify both channels and the normally closed monitoring path, and confirm that loss of supply or a detected fault results in the intended safe state. Document the final setting and test results against the safety validation plan.
A practical acceptance record for 2TLA010033R3000 should include the nameplate photograph, order code, terminal and connector condition, configuration or setting values, software revision where applicable, test equipment and measured results. If 2TLA010033R3000 is installed as part of a larger system, record the system-level response as well as the local device indication.
Related same-series designations
These 2TLA010033R3000 references identify related options or configurations, not automatic substitutes. Check each complete model code, ratings, connection method and compatibility before selection.
No additional same-series reference was selected for 2TLA010033R3000; confirm the complete designation and suffix before ordering.
Procurement and maintenance handover
When requesting a quotation for 2TLA010033R3000, provide the full designation, ABB order number, quantity, installed revision, application voltage, connected load or field-device type, required approvals and delivery destination. Ask the supplier to confirm that the supplied 2TLA010033R3000 matches the stated hardware and accessory configuration. Do not substitute a neighboring family code without engineering review.
