IEGHS11-35748-20-V

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Circuit Breakers

Circuit breakers are electrical devices used to protect circuits and equipment from damage due to overloads and faults. This article will discuss the application field and working principle of the IEGHS11-35748-20-V circuit breaker.

The IEGHS11-35748-20-V is a circuit breaker designed for use in medium voltage systems, typically ranging between 5-38kV. It is suitable for distribution systems, motor control centers, feeder circuits, generator protection, busbar protection and transformer protection. The circuit breaker is a 3-pole system with three independent operating handles and three protection systems: thermal protection, short-circuit protection and instantaneous protection.

The thermal protection system prevents overloads by using an ‘Inverse Time- Overload Characteristic’. This characteristic ensures that the current rating of the circuit breaker is reduced as the operating time increases. This prevents circuits and equipment connected to the circuit breaker from being damaged due to excessive heat. The IEGHS11-35748-20-V also has adjustable calibration for the thermal protection system so that the user can configure the circuit breaker to the current rating of the circuit.

The short-circuit protection system also prevents damage to circuits and equipment. It works by sensing the large currents produced by short-circuiting faults and then quickly trips the circuit breaker before any damage can be caused. The short-circuit protection system is calibrated for the specific circuit it is protecting and can be adjusted depending on the system requirements.

The instantaneous protection system is designed to protect systems and equipment from severe faults. It works by detecting the momentary peaks in current due to faults and immediately closing the contacts of the circuit breaker. The instantaneous protection system is adjustable to accommodate various rated current values.

The working principle of the IEGHS11-35748-20-V circuit breaker is to sense the current travelling through the circuit and then open a set of contacts to disconnect the circuit in the event of an overload, short-circuit fault or severe fault. The current is sensed using current transformers and the contacts are opened using a magnetic actuator. Upon detecting an abnormal current, the actuator is triggered and the contacts open, thus disconnecting the circuit.

In summary, the IEGHS11-35748-20-V is a medium voltage circuit breaker designed for use in distribution systems, motor control centers, feeder circuits, generator protection, busbar protection and transformer protection. It is equipped with three protection systems, the thermal protection system, short-circuit protection system and instantaneous protection system. The working principle is to sense the current and then open a set of contacts in the event of any abnormal current.

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