Description The Edwards 1B3-125 is a 125-watt RMS power amplifier designed for use in life safety and emergency communication systems. It supports 25V or 70V RMS output and includes built-in safeguards against overloads and short circuits. With backup power capability and rack-mount design, the 1B3-125 provides reliable audio amplification for critical notification applications. Technical Specifications Condition New/Never Used Surplus Brand Edwards Category Fire Alarm Systems Part Number 1B3-125 Subcategory Power Amplifier Power Output 125 Watts RMS continuous Output Voltage 25V or 70V RMS Input Supply Voltage 120/240 VAC, 50/60 Hz, or 24–28 VDC optional Backup Power 24 VDC battery backup supported Protection Features Electronic overload/short-circuit protection, thermal overload cutoff (self-restoring) Mounting Type Standard 19-inch rack Certifications UL 1711, UL 1480, UL 813, ULC listed Frequency Response Broad frequency range with low distortion Standby Amplifier Compatible for redundancy against unit failure Primary Use Life safety, emergency voice, and mass notification systems Dimensions (Amplifier) 5.25 × 19.00 × 6.61 in Dimensions (Shipping) 22 × 11 × 8.5 in Weight 22.5 lbs (26.5 lbs shipping weight) Information About 1B3-125 The 1B3-125 is part of the Edwards amplifier series, built for integration into emergency voice and life safety systems. It operates from 120/240V AC or optional 24–28V DC input and includes automatic 24VDC backup support. The unit features self-restoring electronic protection and thermal overload circuits to maintain continuous operation under demanding conditions. Designed for rack-mount installation, it ensures dependable sound distribution with compatibility for standby amplifier configurations. Key Features: High Power Output: Delivers 125 watts continuous RMS for reliable performance in critical applications. Dual Output Voltage: Supports 25V or 70V RMS distribution for flexible system integration. Backup Power: Includes 24 VDC battery backup capability for uninterrupted operation. Built-In Protection: Features self-restoring safeguards against overloads and short circuits. Thermal Overload Safety: Equipped with automatic thermal cutoff to prevent overheating. Rack-Mount Design: Standard 19-inch rack installation for easy system deployment. Compliance: UL listed under standards 1711, 1480, and 813; ULC listed for additional approval. Low Distortion & Broad Frequency Response: Ensures clear and accurate audio reproduction. The 1B3-125 delivers the reliability and precision required for emergency voice communication and life safety audio amplification.
