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.
