The MMTC HBF-BC is a flush-mount interior key switch built for controlled open and close commands on compatible gate and commercial door operators. It uses a center-return open/close action, so the key is turned to send an open or close command and then returns to the neutral center position. This makes it useful at guard stations, interior service doors, equipment rooms, and secured control points where access should be limited to authorized key holders.
This version is supplied with a Best cylinder or equivalent and a stainless steel faceplate. The single-gang back box keeps the installation clean in indoor NEMA 1 locations. Because this is a command station and not a stop station, it should be matched to the operator wiring type before installation. On many LiftMaster industrial operators, open/close-only controls are used with Type D constant-pressure wiring, but the exact wiring method must be verified from the operator diagram.
This key switch may be used with select gate and commercial door controls that are designed for an interior open/close key station. Always verify the operator wiring diagram and required control type before ordering.
This product is a control accessory, not a safety device. Do not use a key switch to bypass photo eyes, sensing edges, monitored entrapment protection, or required emergency stop controls. If the operator does not respond correctly after installation, stop and have the control wiring checked by a qualified technician.
No. The HBF-BC is a NEMA 1 interior flush-mount key switch. For exterior surface-mount applications, verify an outdoor NEMA 4/12 model such as the proper 1KXL-style unit.
HBF-BC is supplied for Best cylinder or equivalent keying. HBF-CC is the changeable core cylinder version. They are similar control stations, but the cylinder/keying style is different.
Only when the operator wiring and local requirements allow an open/close-only station. Many commercial operators also require a separate STOP control or a three-button station.
