交流线圈（AC-coil）

采用AC交流直接激活的继电器输入线圈，如果没有特殊说明，通常用50 Hz电源的V_rms 表示。

相邻触头（Adjacent contacts）

两个不互相联通相邻触点回路（继电器极）之间的绝缘参数，绝缘等级取决于继电器设计，额定电压和周围环境条件。

环境温度（Ambient temperature）

继电器附近（距离根据IEC 61810-1）的温度。最低环境温度和最高环境温度传感器网" href="http://www.51spec.com/category.asp?categoryid=341" target="_blank">温度传感器网" href="http://www.51spec.com/jscontent.asp?id=56&categoryid=67" target="_blank">温度传感器网" href="http://www.51spec.com/category.asp?categoryid=341" target="_blank">温度是指继电器和附件能正常工作最低工作温度和最高工作温度。继电器正常工作应不超过此温度范围内，在指定的温度范围内工作，环境温度不会影响电气寿命。环境温度范围参照IEC 61810-1，并且用°C表示。除另有说明外，环境温度一般为23℃。

Approvals

With the approval label the independent approval agency and/or test house confirms the compliance with the relevant product standards and/or certain product characteristics.

Bandwidth

The range of frequencies for which the performance falls within the specified limits.

Bifurcated contact

see > Twin contact.

Bistable relay, latching relay

In a bistable or latching relay the contacts remain in the last switching position once the coil input voltage is disconnected.

Even though the bistable relays are leaving production preferably in reset contact position, the position of the contact (set position/reset position) is not defined at delivery. The user needs to check the contact position and to set/reset the relay to the required position.

Bistable relays only require a short set respectively reset pulse and do not need any energization once the switching position changed. Unless otherwise stated the bistable relays can endure a permanent energization.

Note: For some relay series a permanent coil power supply is not permitted; in this case the maximum energization duration or the required coil power reduction is indicated in the respective datasheet.

Bistable relay, switching characteristics

In a bistable relay, the contacts remain in the last switching position after the input voltage is disconnected.

Note: Unless otherwise stated the position of the contact (set position/reset position) is not defined at delivery, the customer needs to check the contact position and to set/reset the relay to the required position.

Note: Unlike monostable relays which return to their predefined contact rest state in case of power supply break down and thus might be showing a fail safe behavior, bistable relays do not automatically return to such predefined position. Therefore the application and relay control has to be designed to cover such situations and bistable relays should not be used in applications that are rated according to ISO/TS 16949 7.5.3 'Product Identification and Traceability'.

Bounce

An unintentional phenomenon that can occur during the making or breaking of a contact circuit when the contact elements touch successively and separate again before they have reached their final position.

Bounce time

The time from the first to the last closing or opening of a relay contact. Unless otherwise stated the indicated times are maximum values and are for energization with rated voltage, without any components in series or parallel to the coil, and at reference temperature. Also see > Relay cycles.

Breaking capacity max.

Product of the switching current and switching voltage (in W for direct current, in VA for alternating current). Also see > DC breaking capacity

Bridging contact

Double contact configuration, where two movable contacts are mechanically connected and operate simultaneously. In a bridge configuration, the load current flows from one stationary contact via the bridge to a second stationary contact. See also table Contact arrangement. See > Form X contact, Form Y contact, Form Z contact.