209-2-1-66-4-2-40

Series:	209
Part Status:	Active
Lead Free Status / RoHS Status:	--
Breaker Type:	Magnetic (Hydraulic Delay)
Moisture Sensitivity Level (MSL):	--
Current Rating:	40A
Voltage Rating - AC:	240V
Number of Poles:	2
Actuator Type:	Lever
Illumination:	--
Illumination Voltage (Nominal):	--
Mounting Type:	DIN Rail

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Circuit Breakers

209-2-1-66-4-2-40 Application Field and Working Principle

Circuit breakers are electrical safety components used to protect wiring, appliances, and other electrical components from damaging current or overflowing circuits. They can be set to specific parameters to protect a given load and the system in general from electrical failure. The 209-2-1-66-4-2-40 circuit breaker is a two-pole circuit breaker used in residential and light commercial applications requiring a HACR type breaker. It is designed to trip before an overload or short-circuit can permanently damage the system and its components.

Main components

The 209-2-1-66-4-2-40 circuit breaker consists of two main components, the breaker itself and a trip unit. The breaker is the larger physical component, typically mounted on the panelboard. This includes the housing, live parts, and line and load terminals. The trip unit is a smaller piece of equipment mounted on the inside of the breaker. This device monitors current and is responsible for tripping the breaker when an overcurrent condition is detected.

Electric Arc

The 209-2-1-66-4-2-40 trip unit contains an electric arc detector that can detect arcing under certain conditions. This device is designed to distinguish between a fault current and arcing current. When arcing current is detected, the trip unit will immediately disconnect the breaker. This is due to the fact that an arcing fault can cause a large amount of heat and damage to the circuit and/or system.

Trip Settings

The 209-2-1-66-4-2-40 breaker has adjustable trip settings that can be set to protect the circuit from unduly high or low currents. These settings can be adjusted by the user, but should not be modified unless necessary. Generally, the breaker should be set to trip in the event of an overcurrent, such as an overload or short circuit, before damage can occur. Conversely, an undersized breaker may not trip on an overload, allowing the circuit to be damaged.

Trip Failure

In the event of a trip failure, the 209-2-1-66-4-2-40 breaker will not transmit a signal to the panelboard to trip the breaker. If this occurs, a voltage surge may occur. This can damage the circuit and any equipment connected to it. The trip unit can be reset with the proper procedure.

Testing

The 209-2-1-66-4-2-40 breaker should be tested periodically to ensure that it is functioning properly. A safe method to test the breaker is to first disconnect all lines and loads from the breaker, then turn on the breaker and measure the current that is passing through the breaker with a current clamp. If the current that is measured meets, or exceeds, the maximum ratings of the breaker, then the breaker needs to be replaced.

Conclusion

The 209-2-1-66-4-2-40 circuit breaker is a two-pole breaker used in residential and light commercial applications. It can be used to protect the system and its components from dangerous overcurrents. The trip unit contained in the breaker contains an electric arc detector designed to detect arcing under certain conditions and disconnect the breaker. The adjustable trip settings can be set to protect the circuit from unduly high or low currents. Finally, the breaker should be tested periodically to ensure that it is functioning properly.

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