Why Choose the ABB 2TLA010053R0401 SENTRY SSR42P Safety Relay?
The ABB 2TLA010053R0401, designated SENTRY SSR42P, is a 24 V DC safety relay with two immediate NO safety outputs and two delayed NO safety outputs. Classified within the Safety Relays product group, it is designed for monitoring safety devices with contacts, one or two equivalent channels, and safety devices equipped with OSSD outputs.
A key feature of the SSR42P is its pair of 1.5 s OFF-delay safety outputs. These delayed contacts complement the two immediate safety relay outputs, making the relay suitable for machinery where selected safety-related outputs must remain energised briefly after a stop demand, for example to permit a controlled stopping sequence before power isolation.
The SSR42P operates from 24 V DC and uses detachable push-in spring connection blocks for fast control-panel wiring. Manual or automatic reset can be selected using a switch on the front of the relay. Its slim 22.5 mm housing and support for safety applications up to PL e / SIL 3 make it a versatile choice for industrial machine-safety control systems.
Key Advantages
- Provides 2 NO immediate + 2 NO delayed safety relay outputs.
- Fixed 1.5 s OFF-delay on the two delayed NO outputs.
- Supports both contact-based safety devices and OSSD outputs.
- Selectable manual or automatic reset via a front-panel switch.
- Push-in spring terminals simplify installation and servicing.
- Supports safety applications up to PL e / SIL 3 when correctly integrated.
Key Features
- ABB SENTRY SSR42P safety relay.
- ABB order code 2TLA010053R0401.
- 24 V DC control supply.
- 2 NO immediate failsafe relay outputs.
- 2 NO delayed failsafe relay outputs.
- Fixed delayed-output OFF-delay of 1.5 s.
- Monitoring of safety devices with one or two equivalent channels.
- Compatible with safety devices using OSSD outputs.
- Selectable manual or automatic reset.
- Detachable push-in spring terminals.
- Slim 22.5 mm-wide control-panel housing.
- IP20 degree of protection.
Immediate and Delayed Safety Outputs in One Relay
The SENTRY SSR42P combines two immediately switching safety outputs with two OFF-delayed safety outputs. When the monitored safety function is activated, the immediate contacts can remove power from functions that must stop without delay, while the delayed contacts remain active for 1.5 s before switching off. This architecture can support controlled stopping arrangements where certain actuators must remain enabled briefly before final isolation.
The relay can monitor conventional contact-based safety devices as well as compatible OSSD-equipped devices, providing flexibility across emergency-stop, guard-monitoring and optoelectronic safety applications. Manual or automatic reset selection from the front panel simplifies commissioning, while the push-in terminal version supports efficient wiring and maintenance in industrial control cabinets.
Typical Applications
- Emergency-stop monitoring.
- Safety gate and interlock monitoring.
- Safety light curtains and other OSSD-equipped devices.
- Machinery requiring delayed safe shutdown.
- Controlled stopping sequences before final power isolation.
- Packaging, assembly, processing and automated manufacturing machinery.
