• Supervised Relay for use with 4098-9780 only — designed specifically for compatibility with the 4098-9780 sensor base, this relay ensures reliable control of auxiliary devices while maintaining full supervision of relay wiring and connection status. It provides enhanced safety by immediately detecting open circuits or wiring faults, making it ideal for critical systems where uninterrupted communication and control are vital. Common applications include elevator recall, HVAC shutdown, or door release systems during alarm events.