Buzzer

When the buzzer is UL certified, it usually follows the UL 1638 standard.

The content of the UL 1638 standard is concerned primarily with the safety requirements for bells, buzzers, horns and similar audible signaling devices for electrical and electronic operation. These devices are typically used for commercial general purpose signal services and are designed for use in indoor or outdoor locations or both.

UL 1638 standards specify in detail the electrical, mechanical, thermal and environmental safety requirements that these devices should meet during design and manufacture.

UL 1638 standards may include, but are not limited to, the following:

• electrical safety requirements: Ensure that the equipment can operate normally at rated voltage and current without causing electrical failure, overheating or fire hazards. This may involve testing and evaluation of the electrical components of the device, such as circuits, switches, fuses, etc.

• Mechanical safety requirements: evaluate whether the mechanical structure of the equipment is firm and stable, and there will be no mechanical failure or safety hazards during use. This may involve testing and inspection of components such as housings, fixtures, connectors, etc.

• Thermal safety requirements: Ensure that the equipment will not generate excessive temperatures under normal operating and fault conditions, thereby avoiding dangerous situations such as thermal damage and fire. This may involve testing and evaluating the device's heat dissipation system, thermal protection devices, etc.

• Environmental adaptability requirements: Evaluate the performance and safety of the equipment under different environmental conditions (such as temperature, humidity, vibration, etc.). This may involve environmental fitness testing of the equipment to ensure that it can work properly in various harsh environments.

In addition, UL 1638 standards may also contain requirements for the installation, use and maintenance of equipment to ensure that the equipment can maintain its safety and reliability during use. These requirements may involve provisions on the installation position of the equipment, fixing methods, power connections, etc.