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ESL 1500 Series Fire Alarm Control Panel
ESLSeries Suffix Letters
449 C, CT, CRT, CST, CSRT, CSRH, and CTE
541 C, CXT, NB, NBXT, NCSRH, NCRXT, NCXTE
NCSXT, NCSRXT, NCSXTE
741UT with 702U base U
Table 10. Four-Wire Smoke Detector Compatibility
Table 9. Two-Wire Smoke Detector Compatibility
Detector Series Detector Models Maximum Line Control Unit Compatibliity Number
Resistance Compatibility Identifier per Circuit
(Ohms) Identifier
ESL 400 Series 429C, 429CT 100 C01 S10A 20
Self-Diagnostic 429CRT, 429CST 100 C01 S11A 20
ESL 500 Series 521B, 521NB 100 C01 DIP SW 1 ON S09A 20
and ESL 500N Series DIP SW 1 OFF S10A
521BXT, 521NBXT 100 C01 DIP SW 1 ON S09A 20
DIP SW 1 OFF S10A
521CRXT, 521NCRXT 100 C01 S11A 20
521NCSXT 100 C01 S10A 20
521NCSRXT 100 C01 S11A 20
ESL 700 Series (Heads) 711U, 711UT, 712U, 100 C01 S10A 20
With 700 Series Bases 713-5U, 721UT,741UT
702U, 702E, 702U 100 C01 S00 NA
mounting base
731U 4 wire 100 C01 S11A 20
702RE, 702RU 100 C01 S00 NA
mounting base