Finder 18.51.8.230.0040 is a 110–230 V AC PIR movement and presence detector with a 10 A single-pole output, 360° sensing and an external push-button input for manual On/Off override of automatic indoor lighting.
£98.50
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.
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.
| Current | 10 A |
|---|---|
| Voltage | 230 V |
| Phase | Single Phase |
| Manufacturer | Finder |
| Series | Series 18 |
| Model | 18.51.8.230.0040 |
| Product type | PIR movement and presence detector |
| Supply voltage | 110–230 V AC |
| Supply frequency | 50/60 Hz |
| Contact configuration | 1 NO (SPST-NO) |
| Rated contact current | 10 A |
| Rated contact voltage | 250 V AC |
| Output type | Contact connected to supply live |
| External control | Push-button input for forced On / Off operation |
| Detection field | 360° |
| Movement sensing range | up to 8 m diameter |
| Maximum sensing area | approximately 64 m² |
| Movement sensing zone | approximately 8 × 8 m |
| Presence sensing zone | approximately 4 × 4 m |
| Switch-off delay | 12 s–35 min |
| Incandescent / halogen lamp load | up to 1000 W |
| Fluorescent / compatible load switching capacity | up to 450 VA |
| Operating temperature | -10–+50 °C |
| Protection rating | IP40 |
| Connection type | Push-in terminals |
| Mounting type | Ceiling mounting |
| HS Code | 85365080 |
| Country of Manufacture | Italy |
The Finder 18.51.8.230.0040 is a PIR movement and presence detector designed to automatically control lighting in indoor spaces such as offices, schools and workplaces.
The external push-button input allows users to force the detector output on or off, providing convenient manual control alongside automatic PIR operation.
The detector has a single-pole 1 NO contact rated at 10 A at 250 V AC.
The detector operates from a 110–230 V AC, 50/60 Hz supply.
The detector provides 360° PIR coverage with a movement sensing area extending to approximately 8 m and a more sensitive central presence zone designed to detect smaller occupant movements.
Finder Series 18 movement and presence detectors provide dependable automatic lighting control for commercial, educational and workplace environments, combining sensitive PIR detection with flexible timing, light-level adjustment and convenient manual override functionality.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...