D5B-1021

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Snap Action, Limit Switches

D5B-1021 Application Field and Working Principle

A snap action, limit switch, such as the D5B-1021, is an electrical switch that provides a sudden breaking point in an electrical current, with virtually no dead zone. Limit switches are available in a multitude of configurations, and are widely used in innumerable implementation applications.

This particular model is widely used in motor-starters and circuit breakers, and is usually rated for currents up to 10A. It is a two-part switch containing a spring-loaded armature and actuator plate. D5B-1021s are usually two pole switches, meaning that two buttons or activated points must be pressed in order for the current to be interrupted.

The D5B-1021 uses a snap action mechanism to sense current overloads or surges. When the current level exceeds the limit, the armature snaps into a break-away position, and the switch is reset after the interruption. The reset time is typically very short, and thus modern overload protection systems rely on the fast-acting nature of the limit switch to provide effective protection against current overloads.

Because the mechanism is based on a snap action, there is virtually no dead zone with this model of switch. This is beneficial because it allows the integrator to quickly detect current fluctuations and take corrective action, before any damage can occur to the device or its surrounding environment.

Overall, the D5B-1021 is an important safety device for industrial and commercial applications. The protection provided by this model of limit switch is indispensable for high current applications, and the system’s virtually instantaneous reaction time makes it ideal for seeing and reacting to sudden shifts in current levels.

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