There could be several reasons why certain electrical items, like irons, toasters, or sandwich toasters, don't come with an on/off switch:
Simplicity and Cost-Effectiveness: By omitting an on/off switch, the design and manufacturing of the product become simpler and more cost-effective. Fewer components mean lower production costs, which can translate to a more affordable retail price.
Safety Considerations: Some electrical appliances are designed to have a direct connection to the power source when plugged in, which means they are instantly powered on when the cord is connected to the outlet. While this approach lacks an on/off switch, it can reduce the risk of malfunction or electrical issues associated with additional switches.
Intended Usage Pattern: Manufacturers may assume that users will typically unplug the appliance when it's not in use. For instance, after ironing clothes or toasting bread, users are expected to disconnect the device from the power source. In such cases, an on/off switch may be considered unnecessary.
Longevity and Durability: On/off switches are mechanical components that can wear out over time due to repeated usage. By excluding an on/off switch, the manufacturer may aim to improve the overall longevity and durability of the appliance.
Energy Efficiency: For some appliances, like toasters and sandwich makers, the power consumption during standby mode is relatively low. Hence, manufacturers might assume that the energy saved by turning off the device completely wouldn't be significant compared to the energy used to heat up the appliance from a cold start.
Regulatory Compliance: Depending on the country or region where the appliance is sold, certain safety regulations may influence the design and features of electrical items. An on/off switch might not be mandatory for certain types of appliances.
It's important to note that while some appliances lack a dedicated on/off switch, you can still control their operation by plugging and unplugging them from the power source. However, for appliances where safety and convenience are important, having an easily accessible on/off switch can be beneficial. As with any electrical device, users should follow the manufacturer's instructions for usage and safety guidelines.