Why Choose the ABB SENTRY TSR20 24VDC 2TLA010061R0000 Safety Expansion Timer?
The ABB SENTRY TSR20 24VDC 2TLA010061R0000 is a compact safety expansion timer with delayed relay outputs designed for industrial machinery and automation systems requiring a controlled off-delay. Part of the ABB Jokab Safety Sentry range, the TSR20 combines safety monitoring and output expansion with selectable delayed switching in a space-efficient DIN-rail module.
The TSR20 provides 3 normally open delayed failsafe relay outputs and 1 normally closed relay output. Its OFF-delay can be selected between 0.5 s and 1.5 s using a switch on the front of the unit, allowing machine designers to select the required stopping interval without additional programming or external timing equipment.
Operating from a 24 V DC supply, the TSR20 can monitor safety devices with one or two equivalent contact channels as well as compatible electronic safety devices with OSSD outputs. Its output current capability of up to 6 A, detachable screw compression connection blocks and compact 22.5 mm width make it a practical solution for controlled stopping and safety output expansion applications.
Key Advantages
- Combines safety output expansion and OFF-delay timing in one compact module.
- Selectable 0.5 s or 1.5 s OFF-delay using a front-mounted switch.
- 3 NO delayed failsafe relay outputs plus 1 NC relay output.
- 24 V DC supply for straightforward integration into industrial control systems.
- Supports safety devices with 1 or 2 equivalent contact channels.
- Compatible with electronic safety devices using OSSD outputs.
- Output current capability up to 6 A can reduce the need for intermediary contactors in suitable applications.
- Compact 22.5 mm wide DIN-rail design helps minimise control cabinet space requirements.
Key Features
- ABB Jokab Safety Sentry TSR20 safety expansion timer.
- 24 V DC control supply voltage.
- 3 NO + 1 NC delayed failsafe relay outputs.
- OFF-delay timer function.
- Selectable delay settings of 0.5 s or 1.5 s.
- Monitoring of safety devices with 1 or 2 equivalent contact channels.
- Monitoring of compatible safety devices with OSSD outputs.
- Safe output expansion capability.
- Output current capability up to 6 A.
- Multi-reset functionality allows multiple compatible Sentry relays to share a reset light-button.
- IP20 degree of protection.
- Detachable screw compression connection blocks.
- DIN-rail mounting according to IEC 60715.
Selectable OFF-Delay Safety Control for Industrial Machinery
Safety expansion timers such as the ABB SENTRY TSR20 provide additional safety contacts while introducing a controlled delay before the outputs switch to their safe state. The selectable 0.5 s or 1.5 s OFF-delay allows machinery to complete a defined stopping sequence before selected contactors, brakes, valves or other actuators are de-energised.
Unlike older expansion relays that may require monitoring by a separate device, the Sentry TSR20 incorporates the safety monitoring required for its intended functions. It can work with one-channel or two-channel equivalent contact signals and compatible OSSD outputs, while its 3 NO delayed failsafe outputs provide multiple switching paths for safety-related equipment within modern industrial control systems.
Typical Applications
- Safety output expansion with delayed switching.
- Controlled stopping sequences for industrial machinery.
- Applications requiring a selectable 0.5 s or 1.5 s OFF-delay.
- Delayed disconnection of safety contactors.
- Machine brake and controlled deceleration systems.
- Safety-related valve and actuator control.
- Compatible safety devices with OSSD outputs.
- Industrial manufacturing and automated production equipment.
