ABB RT7B 24DC Safety relay 3 s

Why Choose the ABB RT7B 24DC 2TLA010028R1000 Safety Relay?

The ABB RT7B 24DC 2TLA010028R1000 is a versatile universal safety relay with delayed safety outputs designed for monitoring safety-related circuits in industrial machinery and automation systems. Part of the ABB Jokab Safety RT7 range, it can be used with emergency stops, interlocking switches, light curtains, light beams, safety mats, contact strips, enabling devices and other machine safety equipment.

The RT7B supports both single-channel and dual-channel safety applications and provides a combination of immediate and time-delayed relay outputs. Two normally open safety outputs operate without intentional delay, while a further two normally open safety outputs can provide an off-delay of up to 3 s. This makes the relay particularly useful where hazardous machine movement must be stopped in a controlled sequence before power is completely removed.

Operating from a 24 V DC supply, the RT7B provides 2 NO immediate safety outputs, 2 NO delayed safety outputs and 1 NC output. With manual or automatic reset capability, external device monitoring and a compact 45 mm wide DIN-rail housing, it provides flexible safety control for a broad range of industrial machinery.

Key Advantages

• Universal safety relay for a wide range of industrial machine safety applications.
• 24 V DC control supply for integration into industrial control systems.
• 2 NO immediate plus 2 NO delayed safety outputs.
• Adjustable delayed outputs with settings up to 3 s.
• Supports single-channel and dual-channel safety circuits.
• Suitable for emergency stops, safety guards, light curtains, safety mats and enabling devices.
• Supports manual and automatic reset configurations.
• Safety performance up to Category 4, PL e and SIL 3 when correctly incorporated into an appropriate safety system.

Key Features

• ABB Jokab Safety RT7B universal safety relay.
• 24 V DC +15/-20% supply voltage.
• Single-channel and dual-channel input configurations.
• 2 NO immediate safety outputs.
• 2 NO delayed safety outputs.
• 1 NC relay output.
• RT7B selectable delay options of 0, 1, 2 or 3 s.
• Fast immediate input-to-output deactivation response of <20 ms.
• Manual supervised or automatic reset capability.
• External contactor, relay and valve monitoring capability.
• LED indication for convenient operating and diagnostic status monitoring.
• 45 mm wide DIN-rail mounting for industrial control panels.

Flexible Safety Monitoring with Delayed Machine Stop Outputs

Safety relays such as the ABB RT7B monitor safety devices and provide redundant control outputs for stopping hazardous machine functions when a safety circuit is interrupted. Its flexible input arrangements allow the RT7B to work with equipment including emergency-stop buttons, guard interlocks, light curtains, light beams, safety mats and contact strips.

A key feature of the RT7B is its combination of immediate and delayed safety outputs. The two immediate safety outputs can disconnect selected hazardous functions rapidly, while the two delayed outputs can remain energised for a configured period of up to 3 s. This enables controlled stopping arrangements where machinery needs time to decelerate or complete a defined stopping sequence before selected actuators are disconnected.

Typical Applications

• Emergency-stop safety circuits.
• Interlocked machine guards, gates and hatches.
• Light curtains and safety light beams.
• Safety mats and contact strips.
• Hold-to-run and enabling devices.
• Foot-operated safety control devices.
• Applications requiring delayed safety outputs.
• Area supervision and safety output expansion.