IEC 60947 2 requires circuit breakers to have information printed on the outside. The more there is, the better the device, and the more you will know about what it does. It is information like:
• Rated current (should always show, even when the circuit breaker is installed)
• Manufacturer’s trademark
• Compliance with standard IEC/EN 60947-2
• Selectivity category
• Rated voltage
• Rated impulse withstand voltage
• Rated short circuit making capacity
• Rated short-circuit breaking capacity
• Reference temperature (if different from 30°C)
• Pollution degree
• Rated insulation voltage
• Suitability for isolation (should show even when circuit breaker is installed)
• Clearly marked on and off positions (should show even when circuit breaker is installed)