By supplying as much as 1500lbs (680kg.) holding force, the 8310-101 for Single Doors (NFPA-101) and 8310M-101 for doors with Mullion (NFPA-101), afford high-quality and dependable electromagnetic lock control. These controller units require low energy, thanks to 12VDC output and timing electronics. They are available in choice of brushed dark bronze finish or brushed anodized aluminum and feature infinite relock with manual reset.