SACA Motor Control Practice Exam 2025 - Free Motor Control Practice Questions and Study Guide

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What type of input does a seal-in circuit typically respond to?

Continuous input

Momentary input

A seal-in circuit is designed to respond to momentary inputs. This type of input provides a brief signal, such as a push button press, that initiates a process or a control mechanism. Once activated by this momentary signal, the circuit creates a self-holding condition. In other words, the circuit remains energized even after the momentary input is removed, thanks to auxiliary contacts that maintain the power through the load.

This characteristic is essential for applications where sustained operation is needed after a brief activation, such as in motor starters and control systems. Understanding this function is crucial for designing reliable automated systems and ensuring that they can operate independently without continuous input.

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Variable frequency input

Direct current input

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