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Technical analysis of the correct use of the trip position power monitoring relay

The rated operating voltage of the trip position power monitoring relay is a main technical parameter of the trip position power monitoring relay. When using a trip-position power monitoring relay, the working voltage of the circuit in which it is located (ie, the circuit where the coil of the trip-position power monitoring relay is located) should be considered first. The rated operating voltage of the trip-position power monitoring relay should be equal to the working voltage of the circuit. The operating voltage of the circuit in which it is located is generally 0.86 of the rated operating voltage of the trip position power monitoring relay. Note that the voltage of the workpiece in the circuit must not exceed the rated operating voltage of the trip-position power monitoring relay, otherwise the coil of the trip-position power monitoring relay will be easily burned. In addition, some integrated circuits, such as the NE555 circuit, can directly drive the trip-position power supply monitoring relay, and some integrated circuits, such as the COMS circuit, have a small output current and require a transistor amplifier circuit to drive the trip-position power supply monitoring relay. This should consider that the transistor output current should be greater than the rated operating current of the trip position power monitoring relay.


Selection of contact load


Contact load is the capacity of the contact. The contacts of the trip position power monitoring relay can withstand a certain voltage and current when switching. Therefore, when using a trip position power monitoring relay, the voltage applied to the contacts and the current through the contacts must not exceed the contact load capacity of the trip position power monitoring relay. For example, the contact load of a trip position power monitoring relay is 28V (DC) × 10A, indicating that the contact of the trip position power monitoring relay can only work on a circuit with a direct voltage of 28V, and the contact current is 10A, exceeding 28V or 10A, will affect the normal use of the trip position power monitoring relay, and even burn the contacts.


Selection of the coil power supply for the trip position power monitoring relay


This refers to the use of direct current (DC) or alternating current (AC) by the trip-position power supply monitoring relay coil. Generally, beginners use electronic circuits in electronic production activities, and electronic circuits are often powered by DC power, so it must be a trip-position power monitoring relay with a DC voltage in the coil.