No, boots, covers, and padlocks cannot be universally used on all operator switches. The compatibility of these accessories depends on several factors, including the design, size, and type of the switch, as well as the specific requirements of the application. 
1. **Design and Size**: Operator switches come in various designs and sizes, and accessories like boots, covers, and padlocks must match these specifications to function properly. A boot or cover that fits one switch may not fit another due to differences in dimensions or shape.
2. **Type of Switch**: Different types of switches, such as toggle, push-button, rotary, or rocker switches, may require different types of accessories. For instance, a boot designed for a toggle switch may not be suitable for a push-button switch.
3. **Environmental and Safety Requirements**: In environments where switches are exposed to dust, moisture, or chemicals, specific types of boots and covers are necessary to provide adequate protection. Similarly, in safety-critical applications, padlocks may be required to prevent unauthorized operation, but not all switches are designed to accommodate padlocks.
4. **Manufacturer Specifications**: Manufacturers often provide specific accessories designed to work with their switches. Using non-compatible accessories can lead to improper sealing, reduced functionality, or even damage to the switch.
5. **Regulatory Compliance**: In some industries, regulatory standards dictate the use of specific types of protective accessories. Not all switches are designed to meet these standards when used with generic accessories.
Therefore, it is essential to consult the switch manufacturer’s guidelines and specifications to ensure that the correct boots, covers, and padlocks are used for a particular switch.