尽管在商品目录或数据表中规定有作为继电器近似开关功率的资料，但总还要在实际负载条件下进行试验来确定实际的开关功率。
Although the data of the approximate switching power of the relay is specified in the catalog or data sheet, the actual switching power is always tested under actual load conditions.
触点接触电流
Contact current
通过触点的电流量直接影响触点的性能。例如当继电器用来控制感性负载，诸如电动机或电灯时，触点的磨损将更快，并且由于触点的浪涌电流增加，在配合触点间，便会更经常地产生金属电积。因此在某些部位，触点会不能打开。
The contact current affects the performance of contacts directly. For example, when relays are used to control inductive loads, such as motors or electric lights, the contacts will wear faster, and because of the increase in the inrush current of contacts, the metal electrodeposition will occur more frequently in the coordination contacts. So, in some places, the contacts can't open.
触点保护电路
Contact protection circuit
使用设计用来处长继电器期望寿命的触点保护电路。这种保护另外的好外是抑制噪声，并防止产生碳化物及硝酸，否则当继电器触点打开时，它们将产生在触点表面。但是除去正确设计，保护电路会产生以下不利影响：诸如延长继电器释放时间。
A contact protection circuit designed to minimize the expected life of relays is recommended. The other good protection is to suppress noise and to prevent carbide and nitric acid, otherwise they will be generated on the contact surface when the relay contacts are opened. However, removing the correct design, the protection circuit will have the following adverse effects: such as extending the release time of the relay.
