D4N-4F22-NPT

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Snap action switches are designed to switch quickly and positively, thereby providing circuit changes with minimal disturbance to the system load. They are primarily composed of a spring-loaded switch blade, and a sensing reed or permanent magnet, which must be activated to open or close the switch. In many cases, this sensory device is directly wired to the control circuit and actuates the switch when it approaches, departs or passes through a certain area of the circuit.

The D4N-4F22-NPT is a snap action limit switch from Azbil Corporation. It is a low-function, voltage-controlled type, single-pole single-throw switch that is primarily designed for use as part of electrical installation and control systems. It is typically used in home and industrial automation applications to regulate power and stop or start the operation of machinery.

The basic working principle of the switch is that the contactor is energized when the metal arm or plunger moves in response to an external force. The metal arm is a spring-loaded mechanism that has a ball on the end, which is held in place by a static magnetic field. When the metal arm reaches its trip point, the ball is propelled forward, breaking the static magnetic field and closing the switch. This creates a connection between the two current carrying contacts on the switch, which enables power to be delivered to the device that is wired in the circuit.

The D4N-4F22-NPT has a number of safety features, such as an adjustable and secure mounting bracket for the switch, which allows the unit to be securely mounted to the wall and prevents the switch from slipping out of the mounting hole. It also features a dustproof construction, with raised insulation pins and silicone rubber seals around the switch contacts. This helps to prevent dust, dirt and humidity from entering the switch and triggering false switch activations.

Additionally, the switch has a built-in overload protection system that is designed to protect the switch from current overloads and includes a thermally activated overload trip. This overload protection helps to avoid the risk of fire and burnout of the switch. Furthermore, it also features an auxiliary contact, which is used to connect an alarm or other device that can indicate when the switch is opened or closed.

The D4N-4F22-NPT is a versatile and reliable snap action limit switch, which is suitable for a variety of home and industrial automation applications. It is designed to operate reliably over a wide range of temperatures, and its reliable design ensures that it can be used in a variety of environments and applications. With its built-in safety features, it is well-suited for use in demanding environments, where it can ensure safe and reliable operation.

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