The Pilz S1MS 48VAC 2C/O is a compact and reliable monitoring relay developed for supervision and control in low-voltage automation systems. As part of Pilz’s trusted range of monitoring devices, it ensures that electrical parameters remain within safe limits, helping to protect equipment, processes, and operators. Its combination of accuracy, energy efficiency, and versatility makes it an essential component for modern control systems.

Operating on a 48 V AC supply, this relay is tailored for applications where low-voltage networks are used, such as auxiliary circuits, control panels, and smaller automation systems. Its compatibility with 48 V AC makes it especially useful in facilities where reduced voltage levels are employed for safety or system design reasons.

The unit is equipped with two changeover contacts (2C/O), which provide flexible switching capabilities. These contacts can be used to trigger alarms, switch control circuits, or isolate equipment, giving engineers the ability to integrate the relay into both safety-related and non-safety-related functions. This dual-contact configuration allows simultaneous control of multiple processes, supporting complex automation setups.

One of the key strengths of the S1MS 48VAC 2C/O is its accurate monitoring performance. With a response value of 3.6 kΩ ±10%, it provides precise supervision of connected circuits, ensuring timely detection of irregular conditions. This responsiveness enhances reliability by ensuring corrective measures—such as system shutdowns or warnings—are activated promptly, minimising the risk of equipment damage or unsafe situations.

The device is also engineered with energy efficiency in mind, consuming only 3.5 VA under AC supply. This low power requirement supports long-term operational efficiency, particularly in control systems with multiple monitoring devices installed, where cumulative energy savings become significant.

In terms of build quality, the S1MS is designed for durability and ease of integration. Its compact form factor saves valuable panel space, while its compatibility with standard industrial wiring practices makes installation straightforward. Built to Pilz’s high standards, it also ensures long service life and reduced maintenance needs.

Applications for this monitoring relay include motor control, conveyor technology, process automation, packaging systems, and general industrial equipment. By providing dependable supervision and flexible switching, it contributes to both system uptime and operator safety.

In summary, the Pilz S1MS 48VAC 2C/O monitoring relay combines low-voltage compatibility with versatile switching, precise monitoring, and energy-efficient operation. With its dual changeover contacts, accurate response value, and reliable performance, it is an excellent solution for safeguarding equipment and processes in modern industrial automation systems.