Description
Introduction
The ABB BM/A4.1-134 Busch-Watchdog PRO 280 ° Motion Detector KNX in Traffic White (RAL 9016) is a 4-channel movement detector engineered for indoor and outdoor installations. Designed to automatically switch ABB-i-bus KNX actuators based on movement and ambient brightness, this high-performance sensor provides a broad 280° detection range equipped with ground and rear-field detection for complete creep-under protection. This device is part of our KNX Sensors products range.

Built with support for the KNX Data Secure standard, remote Bluetooth control via the SmartConnect smartphone/tablet app, and versatile mechanical optical adjustment, the BM/A4.1-134 ensures precise automation. It integrates dedicated twilight/brightness and temperature channels along with a programmable RGB status LED to deliver comprehensive monitoring across building automation projects.
Key Features
- 4-channel KNX movement detector for indoor and outdoor applications.
- 280° detection coverage with creep-under protection.
- Bluetooth transmission standard for mobile app interaction.
- KNX Data Secure security standard compliance.
- 1 twilight / brightness channel with three switching thresholds.
- 1 temperature channel with three switching thresholds.
- Programmable status RGB LED with 5 functions.
- Traffic White finish (RAL 9016) with high-quality optical lens.
Benefits
- Comprehensive 280° sensing area with ground and rear-field detection to eliminate blind spots.
- Integrated KNX Data Secure compliance for encrypted and resilient system communication.
- Bluetooth connectivity allowing remote operation of up to 10 KNX functions via the SmartConnect app.
- Multi-channel sensing featuring 4 total channels, including dedicated twilight and temperature channels with 3 switching thresholds each.
- Flexible physical adjustment with horizontal (+90°/-60°), vertical (+30°/-30°), and level balancing (+/-30°) optical alignment.
- Visual operational status provided by a programmable RGB LED supporting up to 5 functions.
- Zero battery maintenance (0 batteries required) with direct connection via the enclosed KNX bus terminal block.
Technical Specifications
Applications
- Automated switching of ABB-i-bus KNX actuators based on movement and light levels in indoor and outdoor settings.
- Environmental monitoring using dedicated twilight and temperature channels with configurable switching thresholds.
- Mobile app-based remote activation and management of up to 10 KNX functions.
Installation Notes
- Connect directly to the KNX bus infrastructure using the included terminal block.
- Adjust optical alignment using physical level balancing (+/-30°), horizontal (+90°/-60°), and vertical (+30°/-30°) controls.
- Utilise the optional push-button object for manual switch-on functionality during configuration.
Developer Resources
- Building Information Modeling (BIM): 9AKK108470A1777
- CE Declaration of Conformity: 2CKA100000E5430
- UK-PSTI Declaration of Conformity: 2CKA410000E0160
- Replaced Product IDs: 2CKA006132A0317, 2CKA006132A0313
FAQ
What is the detection range of the ABB BM/A4.1-134?
The sensor features a 280° detection range with built-in ground and rear-field creep-under protection. Explore more ABB KNX products for professional building automation projects.
Does the BM/A4.1-134 support secure KNX communication?
Yes, it conforms to the KNX Data Secure standard. For certificates and current technical files, refer to the official ABB documentation.
Can this motion detector be operated remotely via mobile app?
Yes, remote operation is supported over Bluetooth using the SmartConnect smartphone/tablet app for up to 10 KNX functions.
What internal channels are included on the detector?
It includes 4 channels total, featuring 1 twilight/brightness channel (3 switching thresholds) and 1 temperature channel (3 switching thresholds).
What is the exact product model?
The order/model code for this page is BM/A4.1-134. Match it against project documents before purchase.
Who is the manufacturer?
This product is manufactured by ABB.
Conclusion
The ABB BM/A4.1-134 Busch-Watchdog PRO 280° KNX Motion Detector combines advanced 4-channel detection, KNX Data Secure protection, and flexible Bluetooth app integration in a durable RAL 9016 Traffic White housing. Installers and system integrators can review our installer purchasing support options.
Order SKU BM/A4.1-134 (Product ID 2CKA006132A0427) from KNXbazzar for reliable building control installations.








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