D4N-9B25

Snap Action, Limit Switches

The D4N-9B25 switch series from Omron is an example of an innovative family of snap action limit switches used in devices like vending machines, machine tools, automotive systems and robotics. Omron terminals provide users with reliable performance and robust construction. Omron designs the D4N-9B25 switches with a variety of actuators, which can be used to operate the snap action functions, including levers, roller levers, sliding plates, and plungers.Omron designs the D4N-9B25 to meet the demands of a wide write of applications, with total heights ranging from 12 to 28 millimetres. While the switch may be miniaturized relative to other limit switches, the components used in the switch are designed to withstand high-shock or vibration levels. Omron also uses a sealing method consistent with IP67 standards, which helps protect against moisture, dust, and other particles.The D4N-9B25 features two contact types – single pole, normally open (SPNO) and single pole, normally closed (SPNC). SPNO is a mechanical switching system that allows power to flow when a certain condition is met. SPNC is a mechanical system that prevents power to flow until a certain condition is also met. These two contact types enable the switch to utilize common base mounting, direct mounting or insulated base mounting with a built-in diode.

Working Principle

The mechanism behind the D4N-9B25’s performance is based on the snap action limit switches. This snap action design isolates two wafers (an outside wafer and an actuator) within a switch body. When the actuator is rotated or released, the two wafers make contact with each other for a brief period of time before being reset to their original state. This allows the D4N-9B25 series to quickly respond to changes in external conditions, such as temperature and humidity.The internal features of the D4N-9B25 ensure reliable performance with each switch rated for a million mechanical cycles and electrical life expectancy of 50 thousand electrical operations. Each switch is constructed with a stamped-metal actuator and silver-nickel contacts. Additionally, the elastomers used in the switch provide some additional shock-resistance during regular operation.

Applications

Because of its small construction, flexibility, and reliable performance, the D4N-9B25 series can be used in various applications. The switch is typically used in device as vending machines, automobiles, machine tools, robotics, and industrial control systems because of its reliable response to changes in outside conditions.In the context of vending machines, the D4N-9B25 can be used to detect when a customer has inserted a coin or bill, making sure that the proper amount of product is dispensed. Additionally, the switch can be used in automobile applications, such as monitoring the break fluid pressure or detecting the position of a vehicle’s transmission.In industrial control systems, the D4N-9B25 can be used for monitoring the presence of liquids or solids, or for controlling automated computer systems. It is also popularly used in robotic and machine tool applications, such as detecting the presence of parts or controlling the cooling water supply.Overall, the D4N-9B25 helps provide stable operation and long-lasting performance in a wide variety of applications.