ABB SENTRY TSR20 24VDC 3no 1nc Off delay timer

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.