Siemens SIRIUS ACT 3SU14 Series Contact Block, 5 → 500V ac/dc, 1NC

Keep a check on your control circuits courtesy of this contact block from Siemens. It's an easy-to-use option that mounts on a front plate and can be conveniently stacked with other units to support complex systems. Inside, there's a movable actuator that makes or breaks electrical connections when the unit's energised. An IP40 rating indicates the enclosure is protected against water jets and objects with a diameter of more than 1mm, so it's a sturdy option for industrial use. You'll find this device in applications such as machinery control, safety systems or building automation.

• Twist prevention feature ensures precise alignment with a switching device to boost performance and minimise circuit failure
• Positive opening function offers reliability as it reduces the risk of the contact block being stuck in the closed position

This unit is suitable for use with AC and DC circuits, and it has a 5 to 500V AC/DC voltage rating. What this means is the contact block can be used safely in electrical circuits that operate inside this range.