The Pilz PNOZ S4 48–240VAC/DC 3 N/O 1 N/C (Part No. 750134) is a versatile and compact safety relay from the PNOZsigma series, designed to monitor vital safety functions and ensure machinery is safely brought to a stop when hazardous conditions are detected. With its broad supply voltage range and modular design, it provides machine builders and operators with a flexible and reliable solution that adapts easily to different system requirements.

One of the standout features of the PNOZ S4 is its wide operating voltage range of 48–240 V AC/DC. This makes it suitable for global use, as it can be installed across different regions and system designs without requiring multiple variants of the same device. This broad compatibility simplifies inventory management, reduces engineering complexity, and ensures adaptability across varied installations.

The relay is designed with dual-channel monitoring through 2 safety inputs, providing redundancy and fault detection in safety circuits. This allows the PNOZ S4 to detect wiring faults, cross faults, or discrepancies between input channels, ensuring hazardous machine operations are reliably interrupted when a safety device such as an emergency stop button, guard switch, two-hand control, or light curtain is triggered.

For outputs, the PNOZ S4 offers a practical configuration with 3 normally open (N/O) safety contacts and 1 normally closed (N/C) auxiliary contact. The N/O contacts disconnect actuators, drives, or motors, ensuring immediate removal of hazardous energy. The N/C auxiliary contact supports signalling and diagnostics, allowing integration into higher-level control systems for monitoring relay status. Additionally, the relay is fitted with a semiconductor output, which provides wear-free diagnostic signalling and enables fast communication with PLCs or other controllers.

The relay is rated to EN 60947-1 (DC-12 utilisation category), with switching capacity up to 240 V AC / 6 A. This ensures reliable performance when handling both resistive and slightly inductive loads, delivering long service life even under demanding industrial conditions.

As part of the PNOZsigma series, the PNOZ S4 is designed for compact installation and modularity. Its slimline housing saves valuable control cabinet space, while clearly marked terminals and user-friendly wiring arrangements simplify setup and reduce commissioning time. This makes it particularly attractive for machine builders seeking efficient yet powerful safety relay solutions.

The PNOZ S4 is widely used in industries such as automotive manufacturing, packaging, robotics, pharmaceuticals, and general machine building, where operator safety and machine uptime are equally important. Its ability to cover a wide voltage range and provide comprehensive outputs makes it a go-to choice for safeguarding small to medium-sized machines as well as for integration into larger safety architectures.

In summary, the Pilz PNOZ S4 48–240VAC/DC 3 N/O 1 N/C (750134) delivers universal voltage compatibility, dual-channel safety monitoring, robust output options, and high switching performance. It is a flexible, compact, and reliable safety relay that ensures compliance with international safety standards while providing dependable protection for operators and equipment.