Selection Table Catalog Number Description Approx. Ship Weight lbs (kg) UPS SDU 10-24 240 VA, 24V/10A DIN Rail DC UPS power module, battery module is required 1.7 (0.77) SDU 20-24 480 VA, 24V/20A DIN Rail DC UPS power module, battery module is required 1.7 (0.77) Battery SDU 24-BAT 24V DIN Rail/Panel Mount Battery Module (cable included) 12.0 (5.33) SDU 24-BATEM 24V External Mount Battery Module (cable included) 16.0 (7.11) Accessories SDU 24EXTBC6 Optional 6 ft. Battery Module cable to 24V DC UPS 0.5 (0.22) SDU 24-DB9 Optional interface kit to convert relay contacts signals to DB9 signals 1.0 (0.45) SDU-PMBRK Optional chassis mount brackets to secure UPS to wall, panel, or enclosure 0.5 (0.22)