Contact is an important part of ABB relay, its performance can be affected by many factors, such as contact material, load type and working frequency, atmospheric environment and other voltage and current values. If any of these factors can not reach the predetermined value, it is likely to have metal accumulation between contacts, or welding point wear and other problems.

当ABB继电器负载断开时，ABB继电器的触点电路变回产生强烈的反电动势，反电动势越高对触点的损坏就越大，这样会直接造成直流转换器开关的容量降低，一旦产生电弧ABB继电器没有零交叉点，就很有可能延长发弧时间不容易减弱，所以也会导致直流电路器中的单相电流使触点产生电积，并且磨损ABB继电器。

When the load of ABB relay is disconnected, the contact circuit of ABB relay will generate strong back EMF. The higher the back EMF is, the greater the damage to the contact will be. This will directly reduce the capacity of DC converter switch. Once the arc is generated, abb relay has no zero crossing point, it is likely to extend the arcing time, Therefore, it will also cause the single-phase current in the DC circuit to make the contacts accumulate and wear the abb relay.

ABB继电器触点的电流可直接影响触点的性能，随着触点浪涌的增加，产生的金属电积也会随其增长，所以建议选择寿命长的ABB继电器保护触点电路。

The contact current of ABB relay can directly affect the performance of the contact. With the increase of contact surge, the metal electrowinning will also increase. Therefore, it is recommended to choose ABB relay with long service life to protect the contact circuit.