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.

• Compact size (50x30x25mm), with mounting tabs that can be drilled for screw mounting.
• Internal audible warning (piezo buzzer).
• Internal visual warning (red LED).
• Ground output (0.5A max) for an optional external buzzer or relay, E.g. to sound the vehicle horn.
• All alarms (visual, internal audible & external output) latch on until the handbrake is applied.
• Options for ground or positive doorframe switch inputs.
• Options for ground or positive handbrake switch inputs.

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