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Current limiters are used when current needs to be capped at a defined level. Current limiters come in two types, those of which are thermal devices and limiting resistors. Limiting resistors in particular are mostly used for DC circuits where the initial current is high. As such, they can regularly be found within starter generators to limit the amount of current to a safe value. Current limiters are also generally useful for preventing the harmful effects of short-circuiting or overloads. Current limiters may be a single device or a group of devices depending on the application, and they may differ in design.
Circuit breakers are set apart from fuses and current limiters due to being an electromechanical device that may interrupt and isolate circuits. While circuit breakers may come in numerous forms, the most common working principle for actuation is the heating of a bi-metallic element which current passes through. In the instance that an overload condition occurs, the circuit breaker has the ability to automatically break contacts and quench arcs to interrupt a circuit. Unlike a fuse which must be replaced each use, a circuit breaker may be reset through automatic or manual means. Circuit breakers will also prevent the closing of contacts if a short circuit is still occurring, and the device will automatically trip again in such instances.
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