ABB RT7 A 2TLA010028R2000 Safety Relay, 24VDC 5-Contact 1.5s Delay PL e SIL3

1. Product Overview

ABB RT7 A 2TLA010028R2000 is a high-end delayed-output safety relay from ABB Jokab Safety’s professional RT7 series, specially designed for machinery safety systems requiring controlled safe stop delay. As a premium 24VDC safety module with unique 1.5-second delayed stop function and 5 integrated contact channels, this DIN rail mount relay provides reliable single/dual-channel safety signal monitoring for medium and high-risk automated machinery. Complying with top international safety standards of PL e / Cat.4 / SIL3, it perfectly solves the safe shutdown demands of inertial equipment that requires buffer stop time. Featuring multi-contact output expansion, full-circuit self-diagnosis, and industrial-grade anti-interference performance, the RT7 A 2TLA010028R2000 is widely used in production lines, rotating machinery, and automated processing equipment that needs delayed safety cutoff protection.

2. Complete Technical Specifications

2.1 Electrical & Safety Core Parameters

TheABB RT7 A 2TLA010028R2000 adopts a stable 24VDC power supply with a tolerance range of -20% to +15%, adapting to voltage fluctuations in industrial control circuits. It features an industry-leading 5-contact integrated configuration (2NO+2NO+1NC), including dual groups of safety normally-open outputs and one auxiliary normally closed signal contact, supporting multi-loop synchronous safety control and real-time status feedback. The core highlight of this model is the built-in 1.5-second fixed safe stop delay, which realizes buffered shutdown for inertial equipment without sudden power failure. It strictly meets ISO 13849-1 Category 4 / PL e and IEC 61508 SIL3 highest safety grades, ensuring zero-misjudgment safety protection for high-risk machinery.

2.2 Signal Detection & Delay Logic Function

This RT7A delayed safety relay supports freely switchable single-channel and dual-channel safety input modes, flexibly matching different equipment risk levels. It integrates professional full-circuit fault diagnosis, which can automatically detect wiring open circuit, short circuit and signal abnormality in real time to avoid invalid protection failures. Different from ordinary instantaneous safety relays, the 2TLA010028R2000 maintains a standard 1.5s delayed output shutdown logic: when safety signals such as emergency stop or safety door trigger are received, the system retains continuous operation for 1.5 seconds before cutting off the safety loop, effectively protecting mechanical structures and conveyor equipment from sudden stop damage. It supports both automatic reset and supervised manual reset modes to adapt to diverse production process logic.

2.3 Mechanical & Environmental Performance

The ABB RT7 A 2TLA010028R2000 adopts industrial-grade compact housing with overall dimensions of 45mm × 84mm × 120mm and a net weight of 0.405kg. It uses standard 35mm DIN rail mounting for fast installation, replacement and cabinet layout optimization. Equipped with anti-loose screw terminals, it ensures stable wiring connection in long-term vibration environments. The module has excellent environmental adaptability, with strong dustproof, shockproof and electromagnetic anti-interference capabilities. It operates stably in a wide temperature range, resisting complex industrial interference such as on-site electromagnetic radiation and voltage surges, and supports long-term uninterrupted industrial cyclic operation.

3. Core Product Features & Advantages

3.1 Exclusive 1.5s Delayed Safe Stop Protection

As a professional delayed safety relay, the ABB RT7 A 2TLA010028R2000 solves the industry pain point of instantaneous shutdown damage to inertial equipment. The fixed 1.5-second delay buffer time allows rotating machinery, conveyor lines and high-speed operating equipment to complete inertial deceleration before safety cutoff, avoiding mechanical impact, material scattering and equipment failure caused by sudden power failure. This built-in fixed delay design requires no external timing module, simplifying circuit structure and improving system stability.

3.2 5-Contact Multi-Loop Expansion Capability

Equipped with a high-expansion 5-contact (2NO+2NO+1NC) structure, this relay has more output resources than conventional 2NO/3NO safety relays. Dual groups of independent safety NO contacts can drive multiple safety loads such as main contactors and auxiliary equipment synchronously, while the NC auxiliary contact provides real-time fault status feedback for upper monitoring systems. It eliminates the need for additional relay expansion modules in complex multi-loop safety interlock systems, greatly simplifying cabinet wiring and reducing system failure points.

3.3 Full Intelligent Fault Self-Diagnosis System

The RT7A safety relay integrates comprehensive real-time diagnosis functions for safety input loops, output contacts and internal circuits. It can actively identify wiring faults, circuit aging and signal anomalies, and lock safety outputs in time to prevent hidden safety hazards. Onboard LED status indicators visually display power supply, input signal, output status and fault alarm information, enabling maintenance personnel to quickly locate faults without professional testing tools, significantly improving equipment maintenance efficiency and system operational safety.

3.4 High Safety Integrity & Strong Compatibility

With authoritative PL e / Cat.4 / SIL3 full safety certification, the 2TLA010028R2000 is applicable to all high-standard industrial machinery safety scenarios. It is fully compatible with all ABB Jokab safety field devices, including emergency stop buttons, safety door interlock switches, safety light curtains and safety mats. It can be seamlessly integrated with mainstream PLC and automation control systems, realizing perfect coordination between delayed safety protection and equipment process control, and helping enterprises meet international machinery safety production specifications.

4. Industrial Application Scenarios

The ABB RT7 A 2TLA010028R2000 delayed safety relay is specially tailored for inertial mechanical equipment safety protection. It is widely used in automated conveyor lines, high-speed packaging machinery, rotating cutting equipment, and continuous production assembly lines that require delayed shutdown buffering. In petrochemical, new energy and general manufacturing industries, it provides safe stop protection for medium and high-risk automated equipment to avoid mechanical collision and material waste caused by sudden shutdown. It is also suitable for safety transformation of old production lines with inertial operation equipment, realizing standardized and intelligent delayed safety interlock control.

5. Frequently Asked Questions (FAQ)

5.1 What is the core feature of ABB RT7 A 2TLA010028R2000?

This model is a 1.5s fixed delayed stop safety relay, featuring 5 integrated contacts and 24VDC power supply. It is specially used for inertial equipment that requires buffer shutdown, with PL e / Cat.4 / SIL3 high safety integrity level.

5.2 What contact configuration does RT7 A 2TLA010028R2000 have?

It adopts a high-expansion 2NO+2NO+1NC five-contact structure, supporting dual-group safety loop output and real-time signal feedback, which meets the control requirements of complex multi-interlock safety systems.

5.3 Why choose delayed safety relay instead of ordinary relay?

Ordinary safety relays trigger instantaneous shutdown, which easily causes inertial equipment damage and material loss. The 1.5s delay buffer of RT7A allows equipment to decelerate stably, protecting mechanical structures and improving production safety and stability.

5.4 What input modes does this relay support?

It supports both single-channel and dual-channel safety signal monitoring modes, which can be switched freely according to equipment risk levels, with flexible configuration and wide application range.