18.51.8.230.0040 Finder PIR 1pole 10A 110/230V Pushbutton

Why Choose the Finder 18.51.8.230.0040 PIR Movement and Presence Detector?

The Finder 18.51.8.230.0040 is a versatile passive infrared (PIR) movement and presence detector designed for automatic lighting control in offices, schools, workplaces and other indoor environments. As part of the Finder Series 18 movement and presence detector range, it provides two sensing areas to detect both normal movement and the smaller movements associated with occupant presence.

This version incorporates an external push-button input that allows the output state to be manually forced on or off when required. Dynamic light compensation, adjustable ambient light sensitivity and an adjustable switch-off delay provide flexible lighting control, while zero-crossing switching helps ensure reliable operation with modern lighting loads.

With a 110–230 V AC, 50/60 Hz supply, a single-pole 1 NO contact rated at 10 A and a movement sensing area extending up to 8 m, the 18.51.8.230.0040 is well suited to energy-efficient lighting automation. Push-in terminals and compatibility with ceiling mounting make installation straightforward in new and existing buildings.

Key Advantages

• Combined PIR movement and presence detection for effective indoor lighting control.
• External push-button input allows the output state to be manually forced on or off.
• 1 NO single-pole contact rated at 10 A for lighting and compatible electrical loads.
• 110–230 V AC supply suitable for common building electrical systems.
• Two sensing zones provide detection of both occupant presence and normal movement.
• Dynamic light compensation improves automatic lighting control according to ambient conditions.
• Adjustable sensitivity, ambient light threshold and switch-off delay.
• Push-in terminals provide fast and convenient electrical installation.

Key Features

• Finder Series 18 PIR movement and presence detector.
• External push-button control input for forcing the output on or off.
• 1 NO (SPST-NO) output contact connected to the supply live.
• 10 A contact rating at 250 V AC.
• 110–230 V AC, 50/60 Hz supply.
• 360° detection field for ceiling-mounted applications.
• Movement sensing diameter of up to 8 m.
• Extensive sensing area of up to approximately 64 m².
• Dedicated presence zone for detecting small occupant movements.
• Dynamic light compensation for intelligent lighting operation.
• Adjustable ambient light intervention threshold.
• Adjustable switch-off delay from 12 s to 35 min.
• Zero-crossing switching for reliable load control.
• IP40 protection rating.
• Push-in terminals for quick installation.

Reliable Movement and Presence Detection for Automatic Lighting

PIR detectors such as the Finder 18.51.8.230.0040 monitor changes in infrared radiation caused by people within the sensing area. Its two-zone detection system is designed to recognise normal movement across the wider coverage area while also responding to smaller movements within the central presence zone, making it particularly useful where occupants may remain seated for extended periods.

The external push-button input provides additional flexibility by allowing users to override automatic operation and force the output on or off. Combined with dynamic light compensation and adjustable timing and ambient light settings, this makes the detector suitable for intelligent lighting systems where both automatic energy saving and convenient manual control are required.

Typical Applications

• Offices and meeting rooms.
• Schools, classrooms and educational buildings.
• Workplaces and commercial premises.
• Automatic indoor lighting systems.
• Meeting and conference facilities.
• Communal areas and building circulation spaces.
• Energy-saving lighting installations.
• Building automation systems requiring push-button override.