For high-reliability interior notification, the System Sensor MHR provides a compact, flexible signaling solution tailored for hotel, residential, and commercial applications. This red SpectrAlert Advance mini-horn is engineered for maximum versatility, featuring a wide operating voltage range from 8 to 33 VDC and regulated 12Vdc or 24Vdc nominal inputs. Technicians can easily configure the device via field-selectable sounder outputs, switching between high and low volume settings and temporal or non-temporal tones to meet specific local AHJ requirements and NFPA 72 compliance. The unit’s small footprint and single-gang back box mounting make it ideal for aesthetically sensitive installations where a low-profile gas/smoke detection accessory is preferred. When integrated with the MDL sync module, the SpectrAlert Advance MHR supports full synchronization, ensuring consistent temporal patterns across the notification circuit while maintaining low current draw at just 21mA (RMS) on 24V regulated circuits. Its mechanical and electrical compatibility with the PA400 series allows for easy retrofits and reliable performance in interior fire alarm systems. Key Benefits Dual-Voltage Flexibility: Seamlessly operates on 12V and 24V notification circuits, reducing inventory needs for diverse projects. Configurable Sound Output: Field-selectable volume (high/low) and tone (temporal/continuous) settings allow for site-specific sound pressure level adjustments. Aesthetic Installation: Sleek, low-profile red housing mounts to a deep single-gang back box for a professional, unobtrusive finish. System Synchronization: Fully compatible with the MDL3 synchronization module to ensure uniform coding across all notification devices. Extended Durability: Rated for operation between 32°F and 120°F (0°C to 49°C) with 10% to 93% non-condensing humidity. Common Questions Can the MHR be used on a coded NAC? Yes, these mini-horns are designed to operate from either continuous or coded NAC circuits, providing flexibility for legacy and modern fire panels. Is this unit compatible with older PA400 series sounders? The MHR is both mechanically and electrically compatible with the PA400 series Mini-Alert sounders, facilitating straightforward hardware upgrades. What wire gauge does the terminal block support? The input terminals accommodate 12 to 18 AWG wiring, standard for most fire life safety equipment installations. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
