Table of Contents
Advertisement
Description
2.3 Protection system
The following constraints apply to the tolerances:
• The parameterized rated frequency is the line frequency at the place of use. On
delivery of the 3WA1 circuit breaker, the rated frequency is parameterized at 50 Hz.
All settings of the electronic trip unit of the circuit breaker at the time of delivery are
stated in Chapter Basic settings of parameter data sets (Page 551).
• The ambient temperature is in the range -5 °C to +55 °C.
2.3.7
DAS+ maintenance mode
An arcing fault can be described as a gas discharge with plasma formation and
temperatures up to 20,000 K, in which the electric current flows through unintended
dynamic paths. In addition to the extreme temperatures, very high pressures are also
generated.
Arcing events typically result from:
• Human error,
inadvertently left behind after maintenance, or improper assembly
• Lack of adequate maintenance for the operating or ambient conditions
• Insulation failure due to aging, environmentally-related degradation, animals in the
system (e.g. snakes or rodents), or operation not in accordance with the product
ratings
After ignition, the arc transforms its surroundings by ionizing the air and converting
metallic materials into conductive plasma and expands with explosive force under
extreme heat. The more material is vaporized, the stronger the arc.
72
such as accidental contact with voltages above ground potential, tools or debris
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
Advertisement
Table of Contents
Troubleshooting
