212-11

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Rotary switches, also known as rotary selectors, are devices that allow the user to select between multiple circuits or inputs in a controlled manner. The 212-11 is a classic example of this type of switch, invented and sold by Johnson Electric in the 1950s.

Rotary switches are typically comprised of two parts, the selector knob and the switch contacts. The selector knob is used to turn the switch and select a particular circuit or input. The switch contacts are stationary and the selector knob turns a cam plate, which in turn moves the contacts into the selected position.

The 212-11 switch is a 2-position, 2-pole rotary switch. It consists of a selector knob, two movable switch blades, and two adjustable contacts. The movable switch blades are constructed of a spring brass, stainless steel, or beryllium copper material and provide backlash-free positive engagements in either one of two switch positions. The adjustable contacts consist of long torsion springs that provide a high level of noise isolation and damping.

The switch is designed to be operated in a high voltage or heavy load application. It is capable of handling up to 500 Volts AC or DC, and can be configured with resistances as low as 10Ω. The contact rating is 25 Amps AC, DC, or resistive.

The 212-11 is often used in applications such as audio amplifier selector switches, pilot lamp navigation switches, and DC power selector switches. It is ideal for applications where a high level of precision, repeatability, and reliability is required.

The 212-11 is a robust and highly reliable switch. However, due to its mechanical construction, it is prone to wear and contamination over time. Therefore, regular cleaning and maintenance are important to ensure its proper operation.

In conclusion, the 212-11 is a classic example of a rotary switch. It is a highly reliable device, capable of handling high voltage and heavy loads. It is ideal for applications where precision, repeatability, and reliability are critical factors. Regular cleaning and maintenance are important to ensure its proper operation.

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