The Pilz S1MS 24VAC/DC 2C/O (840775) is a highly reliable monitoring relay designed for precise and efficient supervision of electrical circuits in automation and safety-related systems. Part of Pilz’s trusted monitoring device portfolio, this unit ensures dependable detection and response in control systems, helping maintain operational integrity and compliance with safety standards.

A defining feature of the S1MS relay is its flexible power compatibility, as it is designed to operate with both AC and DC supply voltages at 24 V. This dual capability makes it an adaptable component for a wide range of applications, from factory automation and process control to machine safety systems. Whether installed in new setups or retrofitted into existing architectures, its versatility simplifies system design and reduces the need for additional power adaptation.

The device also offers energy-efficient operation, consuming just 3.5 VA under AC supply and 2 W under DC supply. This low power requirement not only reduces energy costs but also minimises heat buildup within control cabinets, thereby contributing to longer equipment life and reduced maintenance needs.

Accuracy and reliability are at the core of the S1MS. It features a response value (Ran) of 3.6 kΩ ±10%, ensuring precise monitoring within defined tolerances. This makes the relay particularly valuable in applications where consistency and exact threshold detection are critical, such as load monitoring, resistance supervision, or fault detection scenarios. The calibrated response ensures that the system reacts appropriately to deviations, supporting both safety and efficiency.

For integration into monitoring circuits, the relay provides two changeover (C/O) contacts, which deliver strong switching performance and flexibility. These dual outputs allow the device to be configured for different control strategies, ensuring compatibility with a wide range of machinery and process requirements. The robust contact design supports long-term operation and enhances overall system reliability.

Built for industrial environments, the S1MS is engineered with durability and dependability in mind. Its compact form factor enables easy installation into crowded control cabinets, while its straightforward wiring and clear design reduce setup time. As with other Pilz monitoring devices, the S1MS is designed to integrate seamlessly with Pilz safety relays and controllers, forming part of a complete safety and monitoring solution tailored to modern industrial demands.

In practice, the S1MS 24VAC/DC 2C/O ensures that monitoring tasks are carried out with precision and dependability, helping operators maintain compliance with safety regulations while supporting optimal system performance. Its combination of efficient energy use, precise response values, and robust switching makes it an indispensable tool for engineers tasked with maintaining safe and reliable operations.

In summary, the Pilz S1MS 24VAC/DC 2C/O is a compact, efficient, and accurate monitoring relay. With its universal 24 V supply, low power consumption, and reliable dual contact outputs, it provides a versatile solution for a wide array of industrial monitoring applications.