The Pilz PZW 3/24VDC 1N/O 2N/C, part number 774042, is a compact and robust safety relay designed for flexible use in machine safety and industrial automation. As part of Pilz’s trusted portfolio of safety relays and protection relays, it provides a reliable interface between safety devices and control systems, ensuring that machinery is safely monitored and controlled in line with international standards.

With its balanced contact configuration, the PZW 3 features 1 normally open (N/O) safety contact and 2 normally closed (N/C) auxiliary contacts. This design enables it to not only provide safety switching functions but also integrate system feedback and diagnostics. The safety contact ensures dependable disconnection of hazardous energy sources, while the auxiliary contacts deliver important monitoring signals to higher-level control systems, PLCs, or diagnostic modules. This makes it especially useful in environments where system transparency and fault detection are critical.

Rated for 240 V AC (6 A) and 24 V DC, the relay is versatile enough for use across both alternating and direct current systems. This flexibility allows it to be deployed in a wide variety of safety applications, from motor and actuator shutdowns to monitoring protective devices such as emergency stops, light curtains, and guard doors. Its reliable switching capability ensures safe machine shutdowns in the event of dangerous conditions, reducing the risk of accidents and protecting both personnel and equipment.

The auxiliary contacts further enhance operational safety by enabling operators and supervisory systems to track relay status in real time. This feedback helps streamline diagnostics, reduce downtime, and ensure that faults can be quickly identified and rectified. In environments where high productivity is essential, this capability provides significant benefits by minimising interruptions to operations.

Built in compliance with EN 60947-4-1 utilisation categories, the PZW 3 guarantees long-term reliability and adherence to recognised safety benchmarks. Its electromechanical construction ensures consistent performance even under continuous use, with robust components that withstand the rigours of industrial conditions such as vibration, temperature fluctuations, and frequent switching cycles.

Applications for the PZW 3/24VDC extend across industries such as manufacturing, packaging, robotics, and material handling—anywhere machine safety and system monitoring must work hand-in-hand. Its ability to combine safety outputs with auxiliary monitoring makes it particularly valuable in complex systems where clear communication between devices and control systems is essential.

In summary, the Pilz PZW 3/24VDC 1N/O 2N/C (774042) is a versatile and dependable safety relay that integrates safety switching with monitoring capabilities. With its combination of N/O and N/C contacts, dual auxiliary outputs, AC/DC compatibility, and compliance with EN standards, it offers a practical, reliable, and standards-compliant solution for enhancing both machine safety and operational efficiency.