1089868

Overview

The SICK part number 1089868 corresponds to the WTB4-3P2451S01, a two-wire DC safety light curtain. This device features a resolution of 30 mm and a protective height of 750 mm. It operates on a 24 V DC supply voltage with a current consumption of approximately 100 mA. The unit provides PNP switching outputs and supports a response time of less than 30 ms. It is designed for Category 3 / PL d compliance according to EN ISO 13849-1.

Feature Summary

• Two-wire technology simplifies wiring by combining power and signal lines.
• Compact design allows for integration in space-constrained industrial environments.
• High protection level ensures reliable personnel safeguarding against hazardous moving parts.

Applications

• Machine guarding for press brakes
• Protection zones around automated assembly stations
• Safety monitoring at entry points to robotic workcells

Procurement Notes

Verify the specific ordering suffix matches the required lens configuration and cable length. Confirm that the two-wire interface is compatible with the existing PLC or safety relay inputs. Ensure the protective height meets the calculated risk assessment requirements for the specific machine application before finalizing the purchase order.

Selection Notes

Select this model when space limitations preclude standard four-wire solutions. Ensure the control system can handle the high inrush current typical of two-wire devices during startup. Verify that the ambient conditions do not exceed the specified operating temperature range. Check compatibility with the required safety category and performance level for the machinery.

Part Context

This component belongs to the WTB4 series of safety light curtains from SICK. The series is engineered for robust industrial use, offering various resolutions and heights. The WTB4 line emphasizes ease of installation and maintenance, utilizing standardized mounting brackets and simple parameterization tools for quick setup in diverse manufacturing settings.

Replacement Considerations

Direct replacements must maintain the same 30 mm resolution and 750 mm height. Verify that substitute models support two-wire operation if the existing wiring cannot be modified. Cross-reference safety ratings to ensure equivalent or higher Performance Levels are achieved without redesigning the safety circuit.

FAQ

What is the maximum cable length for this two-wire device?

The maximum cable length depends on the load resistance and voltage drop; consult the technical datasheet for specific limits based on the connected safety relay or controller.

Does this model include integrated diagnostics?

Yes, the receiver unit typically includes LED indicators for status monitoring, such as alignment and fault detection, though detailed diagnostic data may require a compatible communication module.