Addressable Loop Module
Power Supply Unit
Standard Display Module
Power Supply Module
Annunciator Control Module
Common Control Relays
Battery Charge Unit
Serial Transient Protection
Annunciator Expander Module
Masterbox-Line Reversal
Fiberoptic Ethernet Switch
LED Connector Board
Ethernet Transient Protection
USB Expansion Board
Relay Connector Board
Ethernet Switch Unit
Power Transient Protection Board
S21 Mini Monitor Module
S21 Switch Monitor I/O Module Low Voltage
S21 Relay Output Module
S21 Switch Monitor I/O Module 120V AC (UL)
S21 Sounder Control Module
Multi-Voltage Control Relay
S21 Dual Priority Switch Monitor Module
S21 Mini Priority Switch Monitor Module
S21 Switch Monitor Module
S21 Mini Switch Monitor Module
S21 Priority Switch Monitor Module
S21 Switch Monitor I/O Module 120V AC (UL/ULC)
