The Numens 4004-04/07 PSU is a reliable power supply unit designed for fire detection and alarm systems, specifically supporting the operation of control and indicating equipment (CIE) within the Numens 4004 series. It typically provides a regulated 24V DC output, which is essential for powering fire alarm panels, detectors, and associated devices, ensuring stable and continuous system performance. These power supply units are engineered to integrate seamlessly with non-addressable fire alarm systems, delivering consistent voltage required for accurate detection and alarm signaling. Designed for safety-critical applications, the PSU supports both mains power input and backup battery integration, allowing uninterrupted operation during power failures. This is crucial in fire safety systems where continuous functionality is mandatory. The unit also includes supervised outputs and protection features, helping to maintain system integrity and prevent damage due to electrical faults. Built with a durable metal enclosure, the power supply ensures long-term reliability and protection in demanding environments. It is optimized for use in commercial and industrial fire alarm installations, where dependable performance and compliance with safety standards are essential. Overall, the Numens 4004-04/07 PSU serves as a critical component in maintaining efficient and uninterrupted fire detection and alarm system operations.