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Key factors to consider when selecting intermediate relays

When selecting an intermediate relay, multiple factors must be considered to ensure that the equipment can operate stably under various conditions. This article will conduct an in-depth analysis of the main factors that affect the selection of intermediate relays, including geographical location and climate, mechanical stress, excitation coil input parameters, control voltage and contact structure, aiming to provide engineers with a comprehensive selection guide.
1. Geographical location and climate factors
The first thing to consider when selecting an intermediate relay is the geographical location and climate conditions. Factors such as altitude, ambient temperature, humidity, and electromagnetic interference have a particularly significant impact on equipment. In order to adapt to different environmental conditions and ensure long-term stable operation of the equipment, fully sealed intermediate relays are preferred. In particular, metal cover seals can provide better insulation and electrical resistance than plastic sealed products. The fully sealed relay can maintain good electrical contact stability, reliability and excellent switching load capability in harsh environments, and its performance will not be affected by the external climate environment.
2. Mechanical stress factors
The stability of intermediate relays is also affected by mechanical stresses such as vibration, shock and collision. For this reason, when selecting an intermediate relay, attention should be paid to its earthquake resistance and mechanical stress resistance. The small intermediate relay adopts a balanced armature mechanism, which can effectively reduce the damage caused by mechanical stress to the equipment and is an ideal choice to resist such mechanical effects.

3. Excitation coil input parameters
The input parameters of the excitation coil have a significant impact on the performance of the intermediate relay. Factors including over-excitation, under-excitation, isolation of low-voltage excitation and high-voltage output, temperature changes, long-distance wired excitation, and electromagnetic interference all need to be carefully considered during selection. Ensuring that the excitation amount is within the specified range is the key to ensuring reliable and stable operation of the relay.
4. Control voltage
The selection of control voltage is critical to the proper operation of the relay. In actual use, the requirements for control voltage (also called coil voltage) should be clearly defined. Although the relay is marked with a rated control voltage, normal operation of the relay can usually be guaranteed within the range of 70-80% of the rated voltage. At the same time, the reset of the relay is not completely voltage-free. Generally, a voltage lower than 15% is enough to ensure its reset. Therefore, this effect should be particularly considered in control loops where leakage voltages are present.
5. Contact structure
Finally, the contact structure of the intermediate relay is an important consideration when selecting. The common contact structure is single pole double throw, that is, one set of normally open and one set of normally closed. This structure is often called a "pole". During the selection process, it is crucial to clarify the required number of normally open and normally closed points. For example, 2-pole or 4-pole means there are 2 or 4 sets of normally open and normally closed contacts respectively.
Through the above analysis, we see that when selecting an intermediate relay, factors such as geographical location and climate, mechanical stress, excitation coil input parameters, control voltage, and contact structure need to be comprehensively considered. Only by comprehensively considering these factors can we ensure that the selected intermediate relay can work stably and reliably under various conditions and meet the needs of the control system.