Technical Note
Wiring Configurations for Using Relay Modules with 500N Series Smoke Detectors
Using a 405-05 Relay Module with 4-Wire 500N Series Smoke Detectors
ESL 405-05 polarity reversal relay modules are designed for use with ESL smoke detectors that have built-in sounders.
On alarm, the module applies reverse polarity to the detectors activated by the bell or programmable output. Applying
reverse polarity causes the sounders on detectors not in alarm to activate.
Listed Burglar/Fire
Alarm Control Panel
Smoke
Power
+
-
Bell or Pgm
Output
+
-
* Shown with CleanMe Enabled
ESL 405-05
Polarity Reversal Relay
White/Red
Red
Black
White/Black
Contact
NO
Gray
C
Contact
+
-
Power
White
*
NO
C
*
-
+
Power
NO
C
NC
ESL
541NCSXT
Power
Supervision
Relay
ESL
541NCSXTE
Fire Alarm
Zone
24-Hour
Normally Open
EOL
Resistor
Using a 405-03/405-01 Relay Module with 4-Wire 500N Series Smoke Detectors
ESL 405-03/405-01 polarity reversal relay modules are designed for use with ESL smoke detectors that have built-in
sounders. On alarm, the module disconnects the detectors from their normal power supply and applies reverse polarity
from the notification appliance circuit. Applying reverse polarity causes the sounders on detectors not in alarm to activate.
Listed Burglar/Fire
Alarm Control Panel
+
1
2
-
3
4
+
5
6
Smoke
Power
Bell
Output
* Shown with CleanMe Enabled
ESL 405-03
Polarity Reversal Relay
Contact
NO
C
Contact
+
-
Power
-
ESL
204-12/24V
Power
Supervision
Relay
*
NO
C
+
-
*
Power
NC
7
8
C
ESL
541NCSXT
NO
ESL
541NCSRH
541NCSRXT
Fire Alarm
Zone
24-Hour
Normally Open
EOL
Resistor
WARNING !
The 405 relay modules may not be compatible with all power supervision relays. When using this device on 4-wire
circuits, use the ESL 204 series power supervision relay at the end-of-line. An ESL smoke detector with a sounder that
incorporates an end-of-line/sensitivity relay output may also be used.
ESL 08/02
Using a 405-03/405-01 Relay Module with 2-Wire 500N Series Smoke Detectors
ESL 405-03/405-01 polarity reversal relay modules are designed for use with ESL smoke detectors that have built-in
sounders. On alarm, the module disconnects the detectors from their normal power supply and applies reverse polarity
from the notification appliance circuit. Applying reverse polarity causes the sounders on detectors not in alarm to activate.
* Shown with CleanMe Enabled
Listed Burglar/Fire
Alarm Control Panel
ESL 405-01
Polarity Reversal Relay
Fire Alarm
Zone
24-Hour
Normally Open
+
1
2
-
3
4
+
5
6
Bell
Output
EOL
Resistor
+
Note: Polarity in Bell
Output is shown in
alarm condition.
7
8
-
Power
*
+
-
*
Power
NC
C
ESL
521NCSXT
ESL
521NCSRXT
NO
Note: The 405-03, 405-01, and 405-05 modules can be used with 4-wire 500N detectors, but only the
405-03 and the 405-01 can be used with 2-wire 500N detectors.