Description
The Silent Knight EVS-50W is an intelligent 50-watt amplifier designed for use with the 5820XL-EVS system, supporting Class A or B speaker circuits. It offers expansion up to 8 circuits, selectable 25V or 70.7V operation, and can be installed up to 6000 feet from the main panel.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Silent Knight |
| Category |
Fire Alarm Systems |
| Part Number |
EVS-50W |
| Subcategory |
Amplifiers |
| Type |
Intelligent Fire Voice Amplifier |
| Power Rating |
50 W total output, 25 Vrms or 70.7 Vrms selectable |
| Speaker Circuits |
4 fully programmable Class A/B; expandable to 8 with EVS-CE4 |
| Expansion Module |
Compatible with EVS-CE4 audio circuit expander |
| System Compatibility |
5820XL-EVS system |
| Connections |
6-wire harness (2 for VBUS, 4 for SBUS) |
| Distance from Panel |
Mountable up to 6000 feet away |
| SBUS Addressing |
Up to 4 units per system |
| Supervision |
Fully supervised amplifier and circuits |
| Primary Power |
120 VAC, 60 Hz, 580 mA max |
| Standby Current |
85 mA @ 25 Vrms; 100 mA @ 70.7 Vrms |
| Alarm Current |
525 mA @ 25 Vrms; 580 mA @ 70.7 Vrms |
| Battery Capacity |
7–35 Ah charging; 18 Ah max internal |
| Compliance |
UL 864, UL 2572, NFPA 72 |
| Dimensions (Flush) |
14.5W × 24.75H × 3.4D in (36.8 × 62.9 × 8.7 cm) |
| Dimensions (Overall) |
16W × 26.25H × 4.1D in (40.6 × 66.7 × 10.5 cm) |
| Color |
Red |
| Weight |
28 lbs |
Information About EVS-50W
The EVS-50W is an intelligent amplifier by Silent Knight that provides 50 watts of supervised audio power for emergency voice systems. It integrates directly with the 5820XL-EVS platform via SBUS and VBUS connections, supporting four onboard Class A or B speaker circuits that can be expanded to eight with the EVS-CE4. With selectable output of 25V or 70.7V, daily supervision, and compatibility for mounting up to 6000 feet from the main panel, the EVS-50W is engineered for system flexibility. It includes its own power supply and backup battery support, making it a reliable component in fire alarm and emergency communication systems.
Key Features:
- Supervised 50W audio output: The EVS-50W delivers 50 watts of supervised audio power that can be configured for either 25 Vrms or 70.7 Vrms, ensuring compatibility with a wide range of notification appliances and voice evacuation needs.
- Expandable speaker circuits: The unit includes four programmable Class A or Class B speaker circuits out of the box and can be expanded to eight circuits with the optional EVS-CE4 expander, providing flexibility for larger installations.
- Seamless 5820XL-EVS integration: Designed specifically for use with the Silent Knight 5820XL-EVS control panel, the amplifier connects via a six-wire harness—two wires for the Voice Bus (VBUS) and four for the SBUS—for reliable communication.
- Long-distance installation capability: The EVS-50W can be mounted up to 6000 feet away from the main 5820XL-EVS panel, allowing distributed placement throughout a facility for optimized coverage.
- Multiple unit support: The system allows up to four EVS-50W amplifiers per installation, each with a unique SBUS address, expanding system voice capacity for larger buildings.
- Comprehensive supervision: All audio circuits, power supplies, and communication links are fully supervised to detect faults quickly and maintain compliance with fire safety standards.
- Independent power system: The amplifier includes its own power supply and battery charging system, supporting 7–35 Ah batteries (18 Ah maximum within the cabinet) for reliable backup during power outages.
- Compliance with standards: Certified to UL 864, UL 2572, and NFPA 72, the EVS-50W meets rigorous safety and performance requirements for emergency communication systems.
- Durable construction: Housed in a robust red enclosure with overall dimensions of 16 × 26.25 × 4.1 inches, it is built for reliability and straightforward installation in commercial environments.
The EVS-50W delivers the reliability and precision required for expanding and enhancing emergency voice communication within Silent Knight fire alarm systems.
