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Technical Analysis on the Correct Use of Leakage Relays

Technical Analysis on the Correct Use of Leakage Relays


1. Selection of rated working voltage of leakage relay


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


2.Selection of contact load


Contact load is the capacity of the contact. The contacts of the leakage relay can withstand a certain voltage and current during the conversion. Therefore, when using a leakage relay, it should be considered that the voltage applied to the contact and the current through the contact cannot exceed the contact load capacity of the leakage relay. For example, the contact load of a leakage relay is 28V (DC) × 10A, which indicates that the contact of the leakage relay can only work on a circuit with a DC voltage of 28V, and the contact current is 10A, exceeding 28V or 10A, which will affect the leakage relay. Normal use, even burned contacts.


3.Choose the power supply of the leakage relay coil


This refers to whether direct current (DC) or alternating current (AC) is used in the leakage 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 leakage relay with a DC voltage in the coil.