The Fire. Lite MS-4 and MS-4E Fire Alarm Control Panels. FIRE ALARM CONTROL PANEL. SEALED NEW IN BOX. (FACPs) bring the latest in microprocessor technology to conventional. The MS-4 is compatible with the i³T. Smoke detectors from System Sensor, with drift compensation. Maintenance alert, and freeze warning. The Notification Appliance Circuit (NAC) protocol. Can silence audible devices while strobes continue to flash. Using a single pair of wires. The MS-4 is compatible with conventional input devices such as. Two- and four-wire smoke detectors, pull stations, waterflow. Devices, tamper switches and other normally-open contact. Refer to the Fire. Lite Device Compatibility Document. For a complete list of compatible devices.
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