ABB 1SAR503141R0003 Safety Relay

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Product Model

ABB C574 Safety Relay — Order Code 1SAR503141R0003

Technical Specifications

• Model: C574 safety relay, 24 V DC supply (auto-start version)

• Supply voltage: 24 V DC (also available in 24 V AC, 110 V AC, 230 V AC versions)

• Time delay: Adjustable release time from 0.5 to 30 s (or for some variants 0.05 to 3 s)

• Output contacts: 2 safety N.O. contacts + 1 N.C. contact + 2 delayed N.O. contacts (depending on variant)

• Wiring concept: Single-channel or dual-channel configuration; feedback loop provided for external contactor monitoring

• Width: 45 mm

• Achievable safety category: Depending on external wiring, can reach category 3 or category 4 (according to DIN EN 954-1)

• Indicators: LED indicators for Power, Channel 1, Channel 2 and delayed channel status

Advantages & Key Features

• Dual-channel/redundant monitoring: Supports single or dual channel wiring and includes a feedback loop to monitor external contactor status, increasing functional safety.

• Adjustable delay: Release delay time is adjustable (e.g., 0.5–30 s or 0.05–3 s) allowing adaptation to different machine stop or protective requirements.

• Compact mounting size: With a 45 mm width, suitable for installation in cabinets where space is limited.

• Broad applicability: Suitable for Emergency Stop circuits, safety gate monitoring, stop-control systems and a variety of other safety scenarios.

• Visual status indication: LED indicators provide clear feedback of operating state and channel status, aiding diagnostics.

• High safety category achievable: With proper wiring, the device can meet up to Category 4 per EN 954-1, making it suitable for demanding safety applications.

Applications

• Monitoring of emergency stop circuits in industrial machinery such as presses, machining centres — when the E-Stop button is pressed, the relay ensures safe shutdown.

• Safety gate/guard door monitoring — detecting door closed status or lock state, enabling machine operation only when conditions are safe.

• Control systems where safe stoppage or standby switching is required — ensures the safety circuit correctly interrupts power or control when needed.

• Automation production equipment such as assembly lines, robotic stations — ensuring in hazardous conditions the drive or power source is safely shut off.

• Any scenario where compliance with safety standards (e.g., EN 418, DIN EN 954-1) is required.

Precautions

• Before installation, verify that the version selected matches the supply voltage on-site (this version is 24 V DC); if AC version is required, select the correct order code.

• During wiring, adhere strictly to the instruction manual: choose single or dual channel mode, connect feedback loop if required, and select auto-start vs monitored-start appropriately.

• When setting the release delay time, consider the actual stopping behaviour or protection requirement of the machine, to avoid too long a delay creating a safety hazard.

• Ensure the installation environment complies with required temperature, vibration, dust and electromagnetic interference limits to guarantee reliable operation.

• Although this is a safety relay, it typically drives external safety contactors and should not be used alone as a main power switch; integrate into a full safety system.

• Prior to commissioning, perform functional testing: check E-Stop button, guard door lock, feedback loop operation, output contact switching and response time verification.

The structure and details of the product：

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