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交流線圈（AC-coil）
采用AC交流直接激活的繼電器輸入線圈，如果沒有特殊說明，通常用50 Hz電源的Vrms 表示。
相鄰觸頭（Adjacent contacts）
兩個(gè)不互相聯(lián)通相鄰觸點(diǎn)回路（繼電器極）之間的絕緣參數(shù)，絕緣等級(jí)取決于繼電器設(shè)計(jì)，額定電壓和周圍環(huán)境條件。
環(huán)境溫度（Ambient temperature）
繼電器附近（距離根據(jù)IEC 61810-1）的溫度。最低環(huán)境溫度和最高環(huán)境溫度傳感器網(wǎng)" href="http://www.duoyandb.cn/category.asp?categoryid=341" target="_blank">溫度傳感器網(wǎng)" href="http://www.duoyandb.cn/jscontent.asp?id=56&categoryid=67" target="_blank">溫度傳感器網(wǎng)" href="http://www.duoyandb.cn/category.asp?categoryid=341" target="_blank">溫度是指繼電器和附件能正常工作最低工作溫度和最高工作溫度。繼電器正常工作應(yīng)不超過此溫度范圍內(nèi)，在指定的溫度范圍內(nèi)工作，環(huán)境溫度不會(huì)影響電氣壽命。環(huán)境溫度范圍參照IEC 61810-1，并且用°C表示。除另有說明外，環(huán)境溫度一般為23℃。
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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.
| BEAB | British Electrotechnical Approvals Board, England |
| CE | Conformité Européenne, marking for specific products relating to product safety in accordance to European Laws |
| CQC | China Quality Certification Center, Peoples Republic of China |
| CSA | Canadian Standards Association, Canada |
| DEMKO | Danmarks Elektriske Materielkontrol, Denmark |
| FIMKO | Sähkötarkastuskeskus Elinspektionscentralen, Finland |
| KEMA | Naamloze Vennootschap tot Keuring van, Electrotechnische Materialien, Netherlands |
| LLOYD's | Lloyd's Register of Shipping |
| NEMKO | Norges Elektriske Materiellkontroll, Norway |
| ÖVE | Österreichischer Verband für Elektrotechnik, Austria |
| SEMKO | Svenska Elektriska Materiellkontrollanstalten AB, Sweden |
| SEV | Eidgenössisches Starkstrominspektorat, Switzerland |
| TÜV | Technischer Überwachungs-Verein, Germany |
| UL | Underwriters Laboratories, Inc., USA; UL Component Recognition Mark for the United States |
| UL | UL Component Recognition Mark for Canada |
| UL | UL Component Recognition Mark for the United States and Canada |
| VDE | VDE-Prüfstelle, certificate of conformity with factory surveillance, Germany |
Bandwidth
The range of frequencies for which the performance falls within the specified limits.
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Bifurcated contact
see > Twin contact.
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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.
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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'.
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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.
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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.
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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
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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.
