--- title: What Features to Look for in Arc-Flash Relays description: This white paper informs about the most important features in arc-flash relay technology, for more information, please download our white paper. image: https://info.littelfuse.com/hubfs/BATTERY%20ENERGY%20STORAGE%20SYSTEMS%20%28BESSS%29%20HEADER-2.png --- [![Littelfuse - Expertise Applied - Answers Delivered](https://info.littelfuse.com/hs-fs/hubfs/Littelfuse%20Logo.png?width=201&height=47&name=Littelfuse%20Logo.png "Littelfuse - Expertise Applied - Answers Delivered")](https://www.littelfuse.com) ![Key Considerations for Selecting an Arc Flash Relay](https://info.littelfuse.com/hs-fs/hubfs/Electrical/Industrial/Landing_Pages/Banners/Key%20Considerations%20Arc%20Flash-banner1.png?width=990&name=Key%20Considerations%20Arc%20Flash-banner1.png) # **What Features to Look for in Arc-Flash Relays** This white paper informs specifying engineers, original equipment manufacturers, designers, and end users about the most important features in arc-flash relay technology so that they can select the best relay for their application. 弧闪继电器对于减轻弧闪至关重要。每个系统都不尽相同，弧闪继电器也不尽相同。为有效防止弧闪，请选择最适合设施系统的继电器。 The most important features of an arc-flash relay are - Reaction time - Trip reliability - Ease of installation - Sensor flexibility - Software - Sensor design - Avoidance of nuisance tripping - Scalability ## **Arc-Flash Mitigation Basics** Arc-flash relays can quickly detect a developing arc flash by sending a trip signal to the circuit breaker, which reduces the total clearing time and any subsequent damage. 弧闪继电器通过提供直接激活电气系统断路器的输出来实现此目的，该断路器会切断流向电弧故障的电流。弧闪继电器可帮助企业达到NEC的要求，在某些情况下，NEC要求工人在弧闪边界内工作时调整电路保护装置，使其瞬间跳闸。规范规定，如果使用弧闪继电器保护机柜，工人无需采取这一额外步骤。安装弧闪继电器可减少总断开时间，并减少了因电弧故障而释放的能量。最快的弧闪继电器能够检测到正在形成的弧闪，并在不到1毫秒的时间内向断路器发送跳闸信号。断路器将在 35 到 50 毫秒后断开。由于弧闪可吸收螺栓故障电流的一小部分，尤其是在其初始阶段，因此不应仅依靠断路器来区分电弧电流和典型的励磁涌流。使用弧闪继电器可减少对设备的损害，并降低对附近人员的严重伤害。这种损害通常很小，并且仅限于电弧起源的故障点。这可避免在全面弧闪期间发生更广泛、更严重的破坏。弧闪继电器是弧闪防范策略的重要组成部分。 Download the white paper for a deeper discussion about the features of arc-flash relays. [Data Privacy & Communications](https://www.littelfuse.com/data-privacy-and-communications) | [Website Terms of Use](https://www.littelfuse.com/legal/website-terms-of-use) | [Product Disclaimer](https://www.littelfuse.com/legal/product-disclaimer) Littelfuse, Inc. 6133 North River Road, Suite 500, Rosemont, IL 60018 USA, 773-628-1000 Copyright © 2026 Littelfuse, Inc.