The HBA1224 alarm is used in a 12V or 24V automotive system. It monitors the handbrake switch and
the doorframe switch* to provide audible and visual warning if the door is opened while the handbrake
is not applied. Once the alarm starts, it stays latched on until the handbrake is applied (even if the door
is closed again). The HBA1224 improves vehicle safety as it:
Reduces the risk of the vehicle being accidentally left un-attended without the handbrake on.
If used with external relay/horn, it can provide a warning to anyone in the general area, that a
vehicle has been left without it’s handbrake on.
*The doorframe switch is the switch mounted in the doorframe that switches on the cab light when the
door is opened.